root / lib / storage / drbd.py @ ba174485
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1 | 89ff748d | Thomas Thrainer | #
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2 | 89ff748d | Thomas Thrainer | #
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3 | 89ff748d | Thomas Thrainer | |
4 | 89ff748d | Thomas Thrainer | # Copyright (C) 2006, 2007, 2010, 2011, 2012, 2013 Google Inc.
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5 | 89ff748d | Thomas Thrainer | #
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6 | 89ff748d | Thomas Thrainer | # This program is free software; you can redistribute it and/or modify
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7 | 89ff748d | Thomas Thrainer | # it under the terms of the GNU General Public License as published by
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8 | 89ff748d | Thomas Thrainer | # the Free Software Foundation; either version 2 of the License, or
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9 | 89ff748d | Thomas Thrainer | # (at your option) any later version.
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10 | 89ff748d | Thomas Thrainer | #
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11 | 89ff748d | Thomas Thrainer | # This program is distributed in the hope that it will be useful, but
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12 | 89ff748d | Thomas Thrainer | # WITHOUT ANY WARRANTY; without even the implied warranty of
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13 | 89ff748d | Thomas Thrainer | # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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14 | 89ff748d | Thomas Thrainer | # General Public License for more details.
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15 | 89ff748d | Thomas Thrainer | #
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16 | 89ff748d | Thomas Thrainer | # You should have received a copy of the GNU General Public License
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17 | 89ff748d | Thomas Thrainer | # along with this program; if not, write to the Free Software
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18 | 89ff748d | Thomas Thrainer | # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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19 | 89ff748d | Thomas Thrainer | # 02110-1301, USA.
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20 | 89ff748d | Thomas Thrainer | |
21 | 89ff748d | Thomas Thrainer | |
22 | 89ff748d | Thomas Thrainer | """DRBD block device related functionality"""
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23 | 89ff748d | Thomas Thrainer | |
24 | 89ff748d | Thomas Thrainer | import errno |
25 | 89ff748d | Thomas Thrainer | import logging |
26 | 89ff748d | Thomas Thrainer | import time |
27 | 89ff748d | Thomas Thrainer | |
28 | 89ff748d | Thomas Thrainer | from ganeti import constants |
29 | 89ff748d | Thomas Thrainer | from ganeti import utils |
30 | 89ff748d | Thomas Thrainer | from ganeti import errors |
31 | 89ff748d | Thomas Thrainer | from ganeti import netutils |
32 | 89ff748d | Thomas Thrainer | from ganeti import objects |
33 | cde49218 | Helga Velroyen | from ganeti.storage import base |
34 | cde49218 | Helga Velroyen | from ganeti.storage.drbd_info import DRBD8Info |
35 | cde49218 | Helga Velroyen | from ganeti.storage import drbd_info |
36 | cde49218 | Helga Velroyen | from ganeti.storage import drbd_cmdgen |
37 | 89ff748d | Thomas Thrainer | |
38 | 89ff748d | Thomas Thrainer | |
39 | 89ff748d | Thomas Thrainer | # Size of reads in _CanReadDevice
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40 | 89ff748d | Thomas Thrainer | |
41 | 89ff748d | Thomas Thrainer | _DEVICE_READ_SIZE = 128 * 1024 |
42 | 89ff748d | Thomas Thrainer | |
43 | 89ff748d | Thomas Thrainer | |
44 | 47e0abee | Thomas Thrainer | class DRBD8(object): |
45 | 47e0abee | Thomas Thrainer | """Various methods to deals with the DRBD system as a whole.
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46 | 47e0abee | Thomas Thrainer |
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47 | 47e0abee | Thomas Thrainer | This class provides a set of methods to deal with the DRBD installation on
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48 | 47e0abee | Thomas Thrainer | the node or with uninitialized devices as opposed to a DRBD device.
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49 | 47e0abee | Thomas Thrainer |
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50 | 47e0abee | Thomas Thrainer | """
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51 | 47e0abee | Thomas Thrainer | _USERMODE_HELPER_FILE = "/sys/module/drbd/parameters/usermode_helper"
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52 | 47e0abee | Thomas Thrainer | |
53 | 47e0abee | Thomas Thrainer | _MAX_MINORS = 255
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54 | 47e0abee | Thomas Thrainer | |
55 | 47e0abee | Thomas Thrainer | @staticmethod
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56 | 47e0abee | Thomas Thrainer | def GetUsermodeHelper(filename=_USERMODE_HELPER_FILE): |
57 | 47e0abee | Thomas Thrainer | """Returns DRBD usermode_helper currently set.
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58 | 47e0abee | Thomas Thrainer |
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59 | 47e0abee | Thomas Thrainer | @type filename: string
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60 | 47e0abee | Thomas Thrainer | @param filename: the filename to read the usermode helper from
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61 | 47e0abee | Thomas Thrainer | @rtype: string
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62 | 47e0abee | Thomas Thrainer | @return: the currently configured DRBD usermode helper
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63 | 47e0abee | Thomas Thrainer |
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64 | 47e0abee | Thomas Thrainer | """
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65 | 47e0abee | Thomas Thrainer | try:
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66 | 47e0abee | Thomas Thrainer | helper = utils.ReadFile(filename).splitlines()[0]
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67 | 47e0abee | Thomas Thrainer | except EnvironmentError, err: |
68 | 47e0abee | Thomas Thrainer | if err.errno == errno.ENOENT:
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69 | 47e0abee | Thomas Thrainer | base.ThrowError("The file %s cannot be opened, check if the module"
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70 | 47e0abee | Thomas Thrainer | " is loaded (%s)", filename, str(err)) |
71 | 47e0abee | Thomas Thrainer | else:
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72 | 47e0abee | Thomas Thrainer | base.ThrowError("Can't read DRBD helper file %s: %s",
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73 | 47e0abee | Thomas Thrainer | filename, str(err))
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74 | 47e0abee | Thomas Thrainer | if not helper: |
75 | 47e0abee | Thomas Thrainer | base.ThrowError("Can't read any data from %s", filename)
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76 | 47e0abee | Thomas Thrainer | return helper
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77 | 47e0abee | Thomas Thrainer | |
78 | 47e0abee | Thomas Thrainer | @staticmethod
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79 | 47e0abee | Thomas Thrainer | def GetProcInfo(): |
80 | 47e0abee | Thomas Thrainer | """Reads and parses information from /proc/drbd.
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81 | 47e0abee | Thomas Thrainer |
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82 | 47e0abee | Thomas Thrainer | @rtype: DRBD8Info
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83 | 47e0abee | Thomas Thrainer | @return: a L{DRBD8Info} instance containing the current /proc/drbd info
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84 | 47e0abee | Thomas Thrainer |
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85 | 47e0abee | Thomas Thrainer | """
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86 | 47e0abee | Thomas Thrainer | return DRBD8Info.CreateFromFile()
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87 | 47e0abee | Thomas Thrainer | |
88 | 47e0abee | Thomas Thrainer | @staticmethod
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89 | 47e0abee | Thomas Thrainer | def GetUsedDevs(): |
90 | 47e0abee | Thomas Thrainer | """Compute the list of used DRBD minors.
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91 | 47e0abee | Thomas Thrainer |
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92 | 47e0abee | Thomas Thrainer | @rtype: list of ints
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93 | 47e0abee | Thomas Thrainer |
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94 | 47e0abee | Thomas Thrainer | """
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95 | 47e0abee | Thomas Thrainer | info = DRBD8.GetProcInfo() |
96 | 47e0abee | Thomas Thrainer | return filter(lambda m: not info.GetMinorStatus(m).is_unconfigured, |
97 | 47e0abee | Thomas Thrainer | info.GetMinors()) |
98 | 47e0abee | Thomas Thrainer | |
99 | 47e0abee | Thomas Thrainer | @staticmethod
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100 | 47e0abee | Thomas Thrainer | def FindUnusedMinor(): |
101 | 47e0abee | Thomas Thrainer | """Find an unused DRBD device.
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102 | 47e0abee | Thomas Thrainer |
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103 | 47e0abee | Thomas Thrainer | This is specific to 8.x as the minors are allocated dynamically,
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104 | 47e0abee | Thomas Thrainer | so non-existing numbers up to a max minor count are actually free.
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105 | 47e0abee | Thomas Thrainer |
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106 | 47e0abee | Thomas Thrainer | @rtype: int
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107 | 47e0abee | Thomas Thrainer |
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108 | 47e0abee | Thomas Thrainer | """
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109 | 47e0abee | Thomas Thrainer | highest = None
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110 | 47e0abee | Thomas Thrainer | info = DRBD8.GetProcInfo() |
111 | 47e0abee | Thomas Thrainer | for minor in info.GetMinors(): |
112 | 47e0abee | Thomas Thrainer | status = info.GetMinorStatus(minor) |
113 | 47e0abee | Thomas Thrainer | if not status.is_in_use: |
114 | 47e0abee | Thomas Thrainer | return minor
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115 | 47e0abee | Thomas Thrainer | highest = max(highest, minor)
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116 | 47e0abee | Thomas Thrainer | |
117 | 47e0abee | Thomas Thrainer | if highest is None: # there are no minors in use at all |
118 | 47e0abee | Thomas Thrainer | return 0 |
119 | 47e0abee | Thomas Thrainer | if highest >= DRBD8._MAX_MINORS:
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120 | 47e0abee | Thomas Thrainer | logging.error("Error: no free drbd minors!")
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121 | 47e0abee | Thomas Thrainer | raise errors.BlockDeviceError("Can't find a free DRBD minor") |
122 | 47e0abee | Thomas Thrainer | |
123 | 47e0abee | Thomas Thrainer | return highest + 1 |
124 | 47e0abee | Thomas Thrainer | |
125 | 47e0abee | Thomas Thrainer | @staticmethod
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126 | 47e0abee | Thomas Thrainer | def GetCmdGenerator(info): |
127 | 47e0abee | Thomas Thrainer | """Creates a suitable L{BaseDRBDCmdGenerator} based on the given info.
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128 | 47e0abee | Thomas Thrainer |
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129 | 47e0abee | Thomas Thrainer | @type info: DRBD8Info
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130 | 47e0abee | Thomas Thrainer | @rtype: BaseDRBDCmdGenerator
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131 | 47e0abee | Thomas Thrainer |
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132 | 47e0abee | Thomas Thrainer | """
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133 | 47e0abee | Thomas Thrainer | version = info.GetVersion() |
134 | 47e0abee | Thomas Thrainer | if version["k_minor"] <= 3: |
135 | 47e0abee | Thomas Thrainer | return drbd_cmdgen.DRBD83CmdGenerator(version)
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136 | 47e0abee | Thomas Thrainer | else:
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137 | 47e0abee | Thomas Thrainer | return drbd_cmdgen.DRBD84CmdGenerator(version)
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138 | 47e0abee | Thomas Thrainer | |
139 | 47e0abee | Thomas Thrainer | @staticmethod
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140 | 47e0abee | Thomas Thrainer | def ShutdownAll(minor): |
141 | 47e0abee | Thomas Thrainer | """Deactivate the device.
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142 | 47e0abee | Thomas Thrainer |
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143 | 47e0abee | Thomas Thrainer | This will, of course, fail if the device is in use.
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144 | 47e0abee | Thomas Thrainer |
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145 | 47e0abee | Thomas Thrainer | @type minor: int
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146 | 47e0abee | Thomas Thrainer | @param minor: the minor to shut down
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147 | 47e0abee | Thomas Thrainer |
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148 | 47e0abee | Thomas Thrainer | """
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149 | 47e0abee | Thomas Thrainer | info = DRBD8.GetProcInfo() |
150 | 47e0abee | Thomas Thrainer | cmd_gen = DRBD8.GetCmdGenerator(info) |
151 | 47e0abee | Thomas Thrainer | |
152 | 47e0abee | Thomas Thrainer | cmd = cmd_gen.GenDownCmd(minor) |
153 | 47e0abee | Thomas Thrainer | result = utils.RunCmd(cmd) |
154 | 47e0abee | Thomas Thrainer | if result.failed:
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155 | 47e0abee | Thomas Thrainer | base.ThrowError("drbd%d: can't shutdown drbd device: %s",
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156 | 47e0abee | Thomas Thrainer | minor, result.output) |
157 | 47e0abee | Thomas Thrainer | |
158 | 47e0abee | Thomas Thrainer | |
159 | 239364d0 | Thomas Thrainer | class DRBD8Dev(base.BlockDev): |
160 | fd300bc7 | Thomas Thrainer | """DRBD v8.x block device.
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161 | fd300bc7 | Thomas Thrainer |
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162 | fd300bc7 | Thomas Thrainer | This implements the local host part of the DRBD device, i.e. it
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163 | fd300bc7 | Thomas Thrainer | doesn't do anything to the supposed peer. If you need a fully
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164 | fd300bc7 | Thomas Thrainer | connected DRBD pair, you need to use this class on both hosts.
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165 | fd300bc7 | Thomas Thrainer |
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166 | 0c3d9c7c | Thomas Thrainer | The unique_id for the drbd device is a (pnode_uuid, snode_uuid,
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167 | 0c3d9c7c | Thomas Thrainer | port, pnode_minor, lnode_minor, secret) tuple, and it must have
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168 | 0c3d9c7c | Thomas Thrainer | two children: the data device and the meta_device. The meta
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169 | 0c3d9c7c | Thomas Thrainer | device is checked for valid size and is zeroed on create.
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170 | 89ff748d | Thomas Thrainer |
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171 | 89ff748d | Thomas Thrainer | """
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172 | 89ff748d | Thomas Thrainer | _DRBD_MAJOR = 147
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173 | 89ff748d | Thomas Thrainer | |
174 | fd300bc7 | Thomas Thrainer | # timeout constants
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175 | fd300bc7 | Thomas Thrainer | _NET_RECONFIG_TIMEOUT = 60
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176 | fd300bc7 | Thomas Thrainer | |
177 | 0c3d9c7c | Thomas Thrainer | def __init__(self, unique_id, children, size, params, dyn_params): |
178 | fd300bc7 | Thomas Thrainer | if children and children.count(None) > 0: |
179 | fd300bc7 | Thomas Thrainer | children = [] |
180 | fd300bc7 | Thomas Thrainer | if len(children) not in (0, 2): |
181 | fd300bc7 | Thomas Thrainer | raise ValueError("Invalid configuration data %s" % str(children)) |
182 | fd300bc7 | Thomas Thrainer | if not isinstance(unique_id, (tuple, list)) or len(unique_id) != 6: |
183 | fd300bc7 | Thomas Thrainer | raise ValueError("Invalid configuration data %s" % str(unique_id)) |
184 | 0c3d9c7c | Thomas Thrainer | if constants.DDP_LOCAL_IP not in dyn_params or \ |
185 | 0c3d9c7c | Thomas Thrainer | constants.DDP_REMOTE_IP not in dyn_params or \ |
186 | 0c3d9c7c | Thomas Thrainer | constants.DDP_LOCAL_MINOR not in dyn_params or \ |
187 | 0c3d9c7c | Thomas Thrainer | constants.DDP_REMOTE_MINOR not in dyn_params: |
188 | 0c3d9c7c | Thomas Thrainer | raise ValueError("Invalid dynamic parameters %s" % str(dyn_params)) |
189 | 0c3d9c7c | Thomas Thrainer | |
190 | 0c3d9c7c | Thomas Thrainer | self._lhost = dyn_params[constants.DDP_LOCAL_IP]
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191 | 0c3d9c7c | Thomas Thrainer | self._lport = unique_id[2] |
192 | 0c3d9c7c | Thomas Thrainer | self._rhost = dyn_params[constants.DDP_REMOTE_IP]
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193 | 0c3d9c7c | Thomas Thrainer | self._rport = unique_id[2] |
194 | 0c3d9c7c | Thomas Thrainer | self._aminor = dyn_params[constants.DDP_LOCAL_MINOR]
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195 | 0c3d9c7c | Thomas Thrainer | self._secret = unique_id[5] |
196 | 0c3d9c7c | Thomas Thrainer | |
197 | fd300bc7 | Thomas Thrainer | if children:
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198 | fd300bc7 | Thomas Thrainer | if not _CanReadDevice(children[1].dev_path): |
199 | fd300bc7 | Thomas Thrainer | logging.info("drbd%s: Ignoring unreadable meta device", self._aminor) |
200 | fd300bc7 | Thomas Thrainer | children = [] |
201 | 0c3d9c7c | Thomas Thrainer | super(DRBD8Dev, self).__init__(unique_id, children, size, params, |
202 | 0c3d9c7c | Thomas Thrainer | dyn_params) |
203 | fd300bc7 | Thomas Thrainer | self.major = self._DRBD_MAJOR |
204 | 2fe690f1 | Thomas Thrainer | |
205 | 47e0abee | Thomas Thrainer | info = DRBD8.GetProcInfo() |
206 | 47e0abee | Thomas Thrainer | version = info.GetVersion() |
207 | fd300bc7 | Thomas Thrainer | if version["k_major"] != 8: |
208 | fd300bc7 | Thomas Thrainer | base.ThrowError("Mismatch in DRBD kernel version and requested ganeti"
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209 | fd300bc7 | Thomas Thrainer | " usage: kernel is %s.%s, ganeti wants 8.x",
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210 | fd300bc7 | Thomas Thrainer | version["k_major"], version["k_minor"]) |
211 | fd300bc7 | Thomas Thrainer | |
212 | 27c7d9c3 | Thomas Thrainer | if version["k_minor"] <= 3: |
213 | 47e0abee | Thomas Thrainer | self._show_info_cls = drbd_info.DRBD83ShowInfo
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214 | 27c7d9c3 | Thomas Thrainer | else:
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215 | 47e0abee | Thomas Thrainer | self._show_info_cls = drbd_info.DRBD84ShowInfo
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216 | daec28a7 | Thomas Thrainer | |
217 | 47e0abee | Thomas Thrainer | self._cmd_gen = DRBD8.GetCmdGenerator(info)
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218 | 27c7d9c3 | Thomas Thrainer | |
219 | fd300bc7 | Thomas Thrainer | if (self._lhost is not None and self._lhost == self._rhost and |
220 | fd300bc7 | Thomas Thrainer | self._lport == self._rport): |
221 | 0c3d9c7c | Thomas Thrainer | raise ValueError("Invalid configuration data, same local/remote %s, %s" % |
222 | 0c3d9c7c | Thomas Thrainer | (unique_id, dyn_params)) |
223 | fd300bc7 | Thomas Thrainer | self.Attach()
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224 | fd300bc7 | Thomas Thrainer | |
225 | 89ff748d | Thomas Thrainer | @staticmethod
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226 | 89ff748d | Thomas Thrainer | def _DevPath(minor): |
227 | 89ff748d | Thomas Thrainer | """Return the path to a drbd device for a given minor.
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228 | 89ff748d | Thomas Thrainer |
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229 | 47e0abee | Thomas Thrainer | @type minor: int
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230 | 47e0abee | Thomas Thrainer | @rtype: string
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231 | 89ff748d | Thomas Thrainer |
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232 | 89ff748d | Thomas Thrainer | """
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233 | 47e0abee | Thomas Thrainer | return "/dev/drbd%d" % minor |
234 | 89ff748d | Thomas Thrainer | |
235 | 89ff748d | Thomas Thrainer | def _SetFromMinor(self, minor): |
236 | 89ff748d | Thomas Thrainer | """Set our parameters based on the given minor.
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237 | 89ff748d | Thomas Thrainer |
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238 | 89ff748d | Thomas Thrainer | This sets our minor variable and our dev_path.
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239 | 89ff748d | Thomas Thrainer |
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240 | 47e0abee | Thomas Thrainer | @type minor: int
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241 | 47e0abee | Thomas Thrainer |
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242 | 89ff748d | Thomas Thrainer | """
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243 | 89ff748d | Thomas Thrainer | if minor is None: |
244 | 89ff748d | Thomas Thrainer | self.minor = self.dev_path = None |
245 | 89ff748d | Thomas Thrainer | self.attached = False |
246 | 89ff748d | Thomas Thrainer | else:
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247 | 89ff748d | Thomas Thrainer | self.minor = minor
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248 | 89ff748d | Thomas Thrainer | self.dev_path = self._DevPath(minor) |
249 | 89ff748d | Thomas Thrainer | self.attached = True |
250 | 89ff748d | Thomas Thrainer | |
251 | 89ff748d | Thomas Thrainer | @staticmethod
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252 | 89ff748d | Thomas Thrainer | def _CheckMetaSize(meta_device): |
253 | 89ff748d | Thomas Thrainer | """Check if the given meta device looks like a valid one.
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254 | 89ff748d | Thomas Thrainer |
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255 | 89ff748d | Thomas Thrainer | This currently only checks the size, which must be around
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256 | 89ff748d | Thomas Thrainer | 128MiB.
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257 | 89ff748d | Thomas Thrainer |
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258 | 47e0abee | Thomas Thrainer | @type meta_device: string
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259 | 47e0abee | Thomas Thrainer | @param meta_device: the path to the device to check
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260 | 47e0abee | Thomas Thrainer |
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261 | 89ff748d | Thomas Thrainer | """
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262 | 89ff748d | Thomas Thrainer | result = utils.RunCmd(["blockdev", "--getsize", meta_device]) |
263 | 89ff748d | Thomas Thrainer | if result.failed:
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264 | 89ff748d | Thomas Thrainer | base.ThrowError("Failed to get device size: %s - %s",
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265 | 89ff748d | Thomas Thrainer | result.fail_reason, result.output) |
266 | 89ff748d | Thomas Thrainer | try:
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267 | 89ff748d | Thomas Thrainer | sectors = int(result.stdout)
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268 | 89ff748d | Thomas Thrainer | except (TypeError, ValueError): |
269 | 89ff748d | Thomas Thrainer | base.ThrowError("Invalid output from blockdev: '%s'", result.stdout)
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270 | 89ff748d | Thomas Thrainer | num_bytes = sectors * 512
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271 | 89ff748d | Thomas Thrainer | if num_bytes < 128 * 1024 * 1024: # less than 128MiB |
272 | 89ff748d | Thomas Thrainer | base.ThrowError("Meta device too small (%.2fMib)",
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273 | 89ff748d | Thomas Thrainer | (num_bytes / 1024 / 1024)) |
274 | 89ff748d | Thomas Thrainer | # the maximum *valid* size of the meta device when living on top
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275 | 89ff748d | Thomas Thrainer | # of LVM is hard to compute: it depends on the number of stripes
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276 | 89ff748d | Thomas Thrainer | # and the PE size; e.g. a 2-stripe, 64MB PE will result in a 128MB
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277 | 89ff748d | Thomas Thrainer | # (normal size), but an eight-stripe 128MB PE will result in a 1GB
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278 | 89ff748d | Thomas Thrainer | # size meta device; as such, we restrict it to 1GB (a little bit
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279 | 89ff748d | Thomas Thrainer | # too generous, but making assumptions about PE size is hard)
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280 | 89ff748d | Thomas Thrainer | if num_bytes > 1024 * 1024 * 1024: |
281 | 89ff748d | Thomas Thrainer | base.ThrowError("Meta device too big (%.2fMiB)",
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282 | 89ff748d | Thomas Thrainer | (num_bytes / 1024 / 1024)) |
283 | 89ff748d | Thomas Thrainer | |
284 | 09a78e1c | Thomas Thrainer | def _GetShowData(self, minor): |
285 | 47e0abee | Thomas Thrainer | """Return the `drbdsetup show` data.
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286 | 47e0abee | Thomas Thrainer |
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287 | 47e0abee | Thomas Thrainer | @type minor: int
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288 | 47e0abee | Thomas Thrainer | @param minor: the minor to collect show output for
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289 | 47e0abee | Thomas Thrainer | @rtype: string
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290 | 89ff748d | Thomas Thrainer |
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291 | 89ff748d | Thomas Thrainer | """
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292 | 09a78e1c | Thomas Thrainer | result = utils.RunCmd(self._cmd_gen.GenShowCmd(minor))
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293 | 89ff748d | Thomas Thrainer | if result.failed:
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294 | 89ff748d | Thomas Thrainer | logging.error("Can't display the drbd config: %s - %s",
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295 | 89ff748d | Thomas Thrainer | result.fail_reason, result.output) |
296 | 89ff748d | Thomas Thrainer | return None |
297 | 89ff748d | Thomas Thrainer | return result.stdout
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298 | 89ff748d | Thomas Thrainer | |
299 | 27c7d9c3 | Thomas Thrainer | def _GetShowInfo(self, minor): |
300 | 47e0abee | Thomas Thrainer | """Return parsed information from `drbdsetup show`.
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301 | 47e0abee | Thomas Thrainer |
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302 | 47e0abee | Thomas Thrainer | @type minor: int
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303 | 47e0abee | Thomas Thrainer | @param minor: the minor to return information for
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304 | 47e0abee | Thomas Thrainer | @rtype: dict as described in L{drbd_info.BaseShowInfo.GetDevInfo}
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305 | 47e0abee | Thomas Thrainer |
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306 | 47e0abee | Thomas Thrainer | """
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307 | 27c7d9c3 | Thomas Thrainer | return self._show_info_cls.GetDevInfo(self._GetShowData(minor)) |
308 | 27c7d9c3 | Thomas Thrainer | |
309 | 89ff748d | Thomas Thrainer | def _MatchesLocal(self, info): |
310 | 89ff748d | Thomas Thrainer | """Test if our local config matches with an existing device.
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311 | 89ff748d | Thomas Thrainer |
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312 | 47e0abee | Thomas Thrainer | The parameter should be as returned from `_GetShowInfo()`. This
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313 | 89ff748d | Thomas Thrainer | method tests if our local backing device is the same as the one in
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314 | 89ff748d | Thomas Thrainer | the info parameter, in effect testing if we look like the given
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315 | 89ff748d | Thomas Thrainer | device.
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316 | 89ff748d | Thomas Thrainer |
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317 | 47e0abee | Thomas Thrainer | @type info: dict as described in L{drbd_info.BaseShowInfo.GetDevInfo}
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318 | 47e0abee | Thomas Thrainer | @rtype: boolean
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319 | 47e0abee | Thomas Thrainer |
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320 | 89ff748d | Thomas Thrainer | """
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321 | 89ff748d | Thomas Thrainer | if self._children: |
322 | 89ff748d | Thomas Thrainer | backend, meta = self._children
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323 | 89ff748d | Thomas Thrainer | else:
|
324 | 89ff748d | Thomas Thrainer | backend = meta = None
|
325 | 89ff748d | Thomas Thrainer | |
326 | 89ff748d | Thomas Thrainer | if backend is not None: |
327 | 89ff748d | Thomas Thrainer | retval = ("local_dev" in info and info["local_dev"] == backend.dev_path) |
328 | 89ff748d | Thomas Thrainer | else:
|
329 | 89ff748d | Thomas Thrainer | retval = ("local_dev" not in info) |
330 | 89ff748d | Thomas Thrainer | |
331 | 89ff748d | Thomas Thrainer | if meta is not None: |
332 | 89ff748d | Thomas Thrainer | retval = retval and ("meta_dev" in info and |
333 | 89ff748d | Thomas Thrainer | info["meta_dev"] == meta.dev_path)
|
334 | 085b8e24 | Thomas Thrainer | if "meta_index" in info: |
335 | 085b8e24 | Thomas Thrainer | retval = retval and info["meta_index"] == 0 |
336 | 89ff748d | Thomas Thrainer | else:
|
337 | 89ff748d | Thomas Thrainer | retval = retval and ("meta_dev" not in info and |
338 | 89ff748d | Thomas Thrainer | "meta_index" not in info) |
339 | 89ff748d | Thomas Thrainer | return retval
|
340 | 89ff748d | Thomas Thrainer | |
341 | 89ff748d | Thomas Thrainer | def _MatchesNet(self, info): |
342 | 89ff748d | Thomas Thrainer | """Test if our network config matches with an existing device.
|
343 | 89ff748d | Thomas Thrainer |
|
344 | 47e0abee | Thomas Thrainer | The parameter should be as returned from `_GetShowInfo()`. This
|
345 | 89ff748d | Thomas Thrainer | method tests if our network configuration is the same as the one
|
346 | 89ff748d | Thomas Thrainer | in the info parameter, in effect testing if we look like the given
|
347 | 89ff748d | Thomas Thrainer | device.
|
348 | 89ff748d | Thomas Thrainer |
|
349 | 47e0abee | Thomas Thrainer | @type info: dict as described in L{drbd_info.BaseShowInfo.GetDevInfo}
|
350 | 47e0abee | Thomas Thrainer | @rtype: boolean
|
351 | 47e0abee | Thomas Thrainer |
|
352 | 89ff748d | Thomas Thrainer | """
|
353 | 89ff748d | Thomas Thrainer | if (((self._lhost is None and not ("local_addr" in info)) and |
354 | 89ff748d | Thomas Thrainer | (self._rhost is None and not ("remote_addr" in info)))): |
355 | 89ff748d | Thomas Thrainer | return True |
356 | 89ff748d | Thomas Thrainer | |
357 | 89ff748d | Thomas Thrainer | if self._lhost is None: |
358 | 89ff748d | Thomas Thrainer | return False |
359 | 89ff748d | Thomas Thrainer | |
360 | 89ff748d | Thomas Thrainer | if not ("local_addr" in info and |
361 | 89ff748d | Thomas Thrainer | "remote_addr" in info): |
362 | 89ff748d | Thomas Thrainer | return False |
363 | 89ff748d | Thomas Thrainer | |
364 | 89ff748d | Thomas Thrainer | retval = (info["local_addr"] == (self._lhost, self._lport)) |
365 | 89ff748d | Thomas Thrainer | retval = (retval and
|
366 | 89ff748d | Thomas Thrainer | info["remote_addr"] == (self._rhost, self._rport)) |
367 | 89ff748d | Thomas Thrainer | return retval
|
368 | 89ff748d | Thomas Thrainer | |
369 | 89ff748d | Thomas Thrainer | def _AssembleLocal(self, minor, backend, meta, size): |
370 | 89ff748d | Thomas Thrainer | """Configure the local part of a DRBD device.
|
371 | 89ff748d | Thomas Thrainer |
|
372 | 47e0abee | Thomas Thrainer | @type minor: int
|
373 | 47e0abee | Thomas Thrainer | @param minor: the minor to assemble locally
|
374 | 47e0abee | Thomas Thrainer | @type backend: string
|
375 | 47e0abee | Thomas Thrainer | @param backend: path to the data device to use
|
376 | 47e0abee | Thomas Thrainer | @type meta: string
|
377 | 47e0abee | Thomas Thrainer | @param meta: path to the meta device to use
|
378 | 47e0abee | Thomas Thrainer | @type size: int
|
379 | 47e0abee | Thomas Thrainer | @param size: size in MiB
|
380 | 47e0abee | Thomas Thrainer |
|
381 | 89ff748d | Thomas Thrainer | """
|
382 | 09a78e1c | Thomas Thrainer | cmds = self._cmd_gen.GenLocalInitCmds(minor, backend, meta,
|
383 | 09a78e1c | Thomas Thrainer | size, self.params)
|
384 | 89ff748d | Thomas Thrainer | |
385 | 09a78e1c | Thomas Thrainer | for cmd in cmds: |
386 | 09a78e1c | Thomas Thrainer | result = utils.RunCmd(cmd) |
387 | 09a78e1c | Thomas Thrainer | if result.failed:
|
388 | 09a78e1c | Thomas Thrainer | base.ThrowError("drbd%d: can't attach local disk: %s",
|
389 | 09a78e1c | Thomas Thrainer | minor, result.output) |
390 | 89ff748d | Thomas Thrainer | |
391 | 65fc2388 | Thomas Thrainer | def _AssembleNet(self, minor, net_info, dual_pri=False, hmac=None, |
392 | 65fc2388 | Thomas Thrainer | secret=None):
|
393 | 89ff748d | Thomas Thrainer | """Configure the network part of the device.
|
394 | 89ff748d | Thomas Thrainer |
|
395 | 47e0abee | Thomas Thrainer | @type minor: int
|
396 | 47e0abee | Thomas Thrainer | @param minor: the minor to assemble the network for
|
397 | 47e0abee | Thomas Thrainer | @type net_info: (string, int, string, int)
|
398 | 47e0abee | Thomas Thrainer | @param net_info: tuple containing the local address, local port, remote
|
399 | 47e0abee | Thomas Thrainer | address and remote port
|
400 | 47e0abee | Thomas Thrainer | @type dual_pri: boolean
|
401 | 47e0abee | Thomas Thrainer | @param dual_pri: whether two primaries should be allowed or not
|
402 | 47e0abee | Thomas Thrainer | @type hmac: string
|
403 | 47e0abee | Thomas Thrainer | @param hmac: the HMAC algorithm to use
|
404 | 47e0abee | Thomas Thrainer | @type secret: string
|
405 | 47e0abee | Thomas Thrainer | @param secret: the shared secret to use
|
406 | 47e0abee | Thomas Thrainer |
|
407 | 89ff748d | Thomas Thrainer | """
|
408 | 89ff748d | Thomas Thrainer | lhost, lport, rhost, rport = net_info |
409 | 89ff748d | Thomas Thrainer | if None in net_info: |
410 | 89ff748d | Thomas Thrainer | # we don't want network connection and actually want to make
|
411 | 89ff748d | Thomas Thrainer | # sure its shutdown
|
412 | 89ff748d | Thomas Thrainer | self._ShutdownNet(minor)
|
413 | 89ff748d | Thomas Thrainer | return
|
414 | 89ff748d | Thomas Thrainer | |
415 | 65fc2388 | Thomas Thrainer | if dual_pri:
|
416 | 65fc2388 | Thomas Thrainer | protocol = constants.DRBD_MIGRATION_NET_PROTOCOL |
417 | 65fc2388 | Thomas Thrainer | else:
|
418 | 65fc2388 | Thomas Thrainer | protocol = self.params[constants.LDP_PROTOCOL]
|
419 | 65fc2388 | Thomas Thrainer | |
420 | 89ff748d | Thomas Thrainer | # Workaround for a race condition. When DRBD is doing its dance to
|
421 | 89ff748d | Thomas Thrainer | # establish a connection with its peer, it also sends the
|
422 | 89ff748d | Thomas Thrainer | # synchronization speed over the wire. In some cases setting the
|
423 | 89ff748d | Thomas Thrainer | # sync speed only after setting up both sides can race with DRBD
|
424 | 89ff748d | Thomas Thrainer | # connecting, hence we set it here before telling DRBD anything
|
425 | 89ff748d | Thomas Thrainer | # about its peer.
|
426 | 89ff748d | Thomas Thrainer | sync_errors = self._SetMinorSyncParams(minor, self.params) |
427 | 89ff748d | Thomas Thrainer | if sync_errors:
|
428 | 89ff748d | Thomas Thrainer | base.ThrowError("drbd%d: can't set the synchronization parameters: %s" %
|
429 | 89ff748d | Thomas Thrainer | (minor, utils.CommaJoin(sync_errors))) |
430 | 89ff748d | Thomas Thrainer | |
431 | daec28a7 | Thomas Thrainer | family = self._GetNetFamily(minor, lhost, rhost)
|
432 | 89ff748d | Thomas Thrainer | |
433 | 09a78e1c | Thomas Thrainer | cmd = self._cmd_gen.GenNetInitCmd(minor, family, lhost, lport,
|
434 | 09a78e1c | Thomas Thrainer | rhost, rport, protocol, |
435 | 09a78e1c | Thomas Thrainer | dual_pri, hmac, secret, self.params)
|
436 | 09a78e1c | Thomas Thrainer | |
437 | 09a78e1c | Thomas Thrainer | result = utils.RunCmd(cmd) |
438 | 89ff748d | Thomas Thrainer | if result.failed:
|
439 | 89ff748d | Thomas Thrainer | base.ThrowError("drbd%d: can't setup network: %s - %s",
|
440 | 89ff748d | Thomas Thrainer | minor, result.fail_reason, result.output) |
441 | 89ff748d | Thomas Thrainer | |
442 | 89ff748d | Thomas Thrainer | def _CheckNetworkConfig(): |
443 | 27c7d9c3 | Thomas Thrainer | info = self._GetShowInfo(minor)
|
444 | 89ff748d | Thomas Thrainer | if not "local_addr" in info or not "remote_addr" in info: |
445 | 89ff748d | Thomas Thrainer | raise utils.RetryAgain()
|
446 | 89ff748d | Thomas Thrainer | |
447 | 89ff748d | Thomas Thrainer | if (info["local_addr"] != (lhost, lport) or |
448 | 89ff748d | Thomas Thrainer | info["remote_addr"] != (rhost, rport)):
|
449 | 89ff748d | Thomas Thrainer | raise utils.RetryAgain()
|
450 | 89ff748d | Thomas Thrainer | |
451 | 89ff748d | Thomas Thrainer | try:
|
452 | 89ff748d | Thomas Thrainer | utils.Retry(_CheckNetworkConfig, 1.0, 10.0) |
453 | 89ff748d | Thomas Thrainer | except utils.RetryTimeout:
|
454 | 89ff748d | Thomas Thrainer | base.ThrowError("drbd%d: timeout while configuring network", minor)
|
455 | 89ff748d | Thomas Thrainer | |
456 | daec28a7 | Thomas Thrainer | @staticmethod
|
457 | daec28a7 | Thomas Thrainer | def _GetNetFamily(minor, lhost, rhost): |
458 | daec28a7 | Thomas Thrainer | if netutils.IP6Address.IsValid(lhost):
|
459 | daec28a7 | Thomas Thrainer | if not netutils.IP6Address.IsValid(rhost): |
460 | daec28a7 | Thomas Thrainer | base.ThrowError("drbd%d: can't connect ip %s to ip %s" %
|
461 | daec28a7 | Thomas Thrainer | (minor, lhost, rhost)) |
462 | daec28a7 | Thomas Thrainer | return "ipv6" |
463 | daec28a7 | Thomas Thrainer | elif netutils.IP4Address.IsValid(lhost):
|
464 | daec28a7 | Thomas Thrainer | if not netutils.IP4Address.IsValid(rhost): |
465 | daec28a7 | Thomas Thrainer | base.ThrowError("drbd%d: can't connect ip %s to ip %s" %
|
466 | daec28a7 | Thomas Thrainer | (minor, lhost, rhost)) |
467 | daec28a7 | Thomas Thrainer | return "ipv4" |
468 | daec28a7 | Thomas Thrainer | else:
|
469 | daec28a7 | Thomas Thrainer | base.ThrowError("drbd%d: Invalid ip %s" % (minor, lhost))
|
470 | daec28a7 | Thomas Thrainer | |
471 | 89ff748d | Thomas Thrainer | def AddChildren(self, devices): |
472 | 89ff748d | Thomas Thrainer | """Add a disk to the DRBD device.
|
473 | 89ff748d | Thomas Thrainer |
|
474 | 47e0abee | Thomas Thrainer | @type devices: list of L{BlockDev}
|
475 | 47e0abee | Thomas Thrainer | @param devices: a list of exactly two L{BlockDev} objects; the first
|
476 | 47e0abee | Thomas Thrainer | denotes the data device, the second the meta device for this DRBD device
|
477 | 47e0abee | Thomas Thrainer |
|
478 | 89ff748d | Thomas Thrainer | """
|
479 | 89ff748d | Thomas Thrainer | if self.minor is None: |
480 | 89ff748d | Thomas Thrainer | base.ThrowError("drbd%d: can't attach to dbrd8 during AddChildren",
|
481 | 89ff748d | Thomas Thrainer | self._aminor)
|
482 | 89ff748d | Thomas Thrainer | if len(devices) != 2: |
483 | 89ff748d | Thomas Thrainer | base.ThrowError("drbd%d: need two devices for AddChildren", self.minor) |
484 | 27c7d9c3 | Thomas Thrainer | info = self._GetShowInfo(self.minor) |
485 | 89ff748d | Thomas Thrainer | if "local_dev" in info: |
486 | 89ff748d | Thomas Thrainer | base.ThrowError("drbd%d: already attached to a local disk", self.minor) |
487 | 89ff748d | Thomas Thrainer | backend, meta = devices |
488 | 89ff748d | Thomas Thrainer | if backend.dev_path is None or meta.dev_path is None: |
489 | 89ff748d | Thomas Thrainer | base.ThrowError("drbd%d: children not ready during AddChildren",
|
490 | 89ff748d | Thomas Thrainer | self.minor)
|
491 | 89ff748d | Thomas Thrainer | backend.Open() |
492 | 89ff748d | Thomas Thrainer | meta.Open() |
493 | 89ff748d | Thomas Thrainer | self._CheckMetaSize(meta.dev_path)
|
494 | 47e0abee | Thomas Thrainer | self._InitMeta(DRBD8.FindUnusedMinor(), meta.dev_path)
|
495 | 89ff748d | Thomas Thrainer | |
496 | 89ff748d | Thomas Thrainer | self._AssembleLocal(self.minor, backend.dev_path, meta.dev_path, self.size) |
497 | 89ff748d | Thomas Thrainer | self._children = devices
|
498 | 89ff748d | Thomas Thrainer | |
499 | 89ff748d | Thomas Thrainer | def RemoveChildren(self, devices): |
500 | 89ff748d | Thomas Thrainer | """Detach the drbd device from local storage.
|
501 | 89ff748d | Thomas Thrainer |
|
502 | 47e0abee | Thomas Thrainer | @type devices: list of L{BlockDev}
|
503 | 47e0abee | Thomas Thrainer | @param devices: a list of exactly two L{BlockDev} objects; the first
|
504 | 47e0abee | Thomas Thrainer | denotes the data device, the second the meta device for this DRBD device
|
505 | 47e0abee | Thomas Thrainer |
|
506 | 89ff748d | Thomas Thrainer | """
|
507 | 89ff748d | Thomas Thrainer | if self.minor is None: |
508 | 89ff748d | Thomas Thrainer | base.ThrowError("drbd%d: can't attach to drbd8 during RemoveChildren",
|
509 | 89ff748d | Thomas Thrainer | self._aminor)
|
510 | 89ff748d | Thomas Thrainer | # early return if we don't actually have backing storage
|
511 | 27c7d9c3 | Thomas Thrainer | info = self._GetShowInfo(self.minor) |
512 | 89ff748d | Thomas Thrainer | if "local_dev" not in info: |
513 | 89ff748d | Thomas Thrainer | return
|
514 | 89ff748d | Thomas Thrainer | if len(self._children) != 2: |
515 | 89ff748d | Thomas Thrainer | base.ThrowError("drbd%d: we don't have two children: %s", self.minor, |
516 | 89ff748d | Thomas Thrainer | self._children)
|
517 | 89ff748d | Thomas Thrainer | if self._children.count(None) == 2: # we don't actually have children :) |
518 | 89ff748d | Thomas Thrainer | logging.warning("drbd%d: requested detach while detached", self.minor) |
519 | 89ff748d | Thomas Thrainer | return
|
520 | 89ff748d | Thomas Thrainer | if len(devices) != 2: |
521 | 89ff748d | Thomas Thrainer | base.ThrowError("drbd%d: we need two children in RemoveChildren",
|
522 | 89ff748d | Thomas Thrainer | self.minor)
|
523 | 89ff748d | Thomas Thrainer | for child, dev in zip(self._children, devices): |
524 | 89ff748d | Thomas Thrainer | if dev != child.dev_path:
|
525 | 89ff748d | Thomas Thrainer | base.ThrowError("drbd%d: mismatch in local storage (%s != %s) in"
|
526 | 89ff748d | Thomas Thrainer | " RemoveChildren", self.minor, dev, child.dev_path) |
527 | 89ff748d | Thomas Thrainer | |
528 | 89ff748d | Thomas Thrainer | self._ShutdownLocal(self.minor) |
529 | 89ff748d | Thomas Thrainer | self._children = []
|
530 | 89ff748d | Thomas Thrainer | |
531 | 2fe690f1 | Thomas Thrainer | def _SetMinorSyncParams(self, minor, params): |
532 | 89ff748d | Thomas Thrainer | """Set the parameters of the DRBD syncer.
|
533 | 89ff748d | Thomas Thrainer |
|
534 | 89ff748d | Thomas Thrainer | This is the low-level implementation.
|
535 | 89ff748d | Thomas Thrainer |
|
536 | 89ff748d | Thomas Thrainer | @type minor: int
|
537 | 89ff748d | Thomas Thrainer | @param minor: the drbd minor whose settings we change
|
538 | 89ff748d | Thomas Thrainer | @type params: dict
|
539 | 89ff748d | Thomas Thrainer | @param params: LD level disk parameters related to the synchronization
|
540 | 89ff748d | Thomas Thrainer | @rtype: list
|
541 | 89ff748d | Thomas Thrainer | @return: a list of error messages
|
542 | 89ff748d | Thomas Thrainer |
|
543 | 89ff748d | Thomas Thrainer | """
|
544 | 09a78e1c | Thomas Thrainer | cmd = self._cmd_gen.GenSyncParamsCmd(minor, params)
|
545 | 09a78e1c | Thomas Thrainer | result = utils.RunCmd(cmd) |
546 | 89ff748d | Thomas Thrainer | if result.failed:
|
547 | 89ff748d | Thomas Thrainer | msg = ("Can't change syncer rate: %s - %s" %
|
548 | 89ff748d | Thomas Thrainer | (result.fail_reason, result.output)) |
549 | 89ff748d | Thomas Thrainer | logging.error(msg) |
550 | 89ff748d | Thomas Thrainer | return [msg]
|
551 | 89ff748d | Thomas Thrainer | |
552 | 89ff748d | Thomas Thrainer | return []
|
553 | 89ff748d | Thomas Thrainer | |
554 | 89ff748d | Thomas Thrainer | def SetSyncParams(self, params): |
555 | 89ff748d | Thomas Thrainer | """Set the synchronization parameters of the DRBD syncer.
|
556 | 89ff748d | Thomas Thrainer |
|
557 | 47e0abee | Thomas Thrainer | See L{BlockDev.SetSyncParams} for parameter description.
|
558 | 89ff748d | Thomas Thrainer |
|
559 | 89ff748d | Thomas Thrainer | """
|
560 | 89ff748d | Thomas Thrainer | if self.minor is None: |
561 | 89ff748d | Thomas Thrainer | err = "Not attached during SetSyncParams"
|
562 | 89ff748d | Thomas Thrainer | logging.info(err) |
563 | 89ff748d | Thomas Thrainer | return [err]
|
564 | 89ff748d | Thomas Thrainer | |
565 | 239364d0 | Thomas Thrainer | children_result = super(DRBD8Dev, self).SetSyncParams(params) |
566 | 89ff748d | Thomas Thrainer | children_result.extend(self._SetMinorSyncParams(self.minor, params)) |
567 | 89ff748d | Thomas Thrainer | return children_result
|
568 | 89ff748d | Thomas Thrainer | |
569 | 89ff748d | Thomas Thrainer | def PauseResumeSync(self, pause): |
570 | 89ff748d | Thomas Thrainer | """Pauses or resumes the sync of a DRBD device.
|
571 | 89ff748d | Thomas Thrainer |
|
572 | 47e0abee | Thomas Thrainer | See L{BlockDev.PauseResumeSync} for parameter description.
|
573 | 89ff748d | Thomas Thrainer |
|
574 | 89ff748d | Thomas Thrainer | """
|
575 | 89ff748d | Thomas Thrainer | if self.minor is None: |
576 | 89ff748d | Thomas Thrainer | logging.info("Not attached during PauseSync")
|
577 | 89ff748d | Thomas Thrainer | return False |
578 | 89ff748d | Thomas Thrainer | |
579 | 239364d0 | Thomas Thrainer | children_result = super(DRBD8Dev, self).PauseResumeSync(pause) |
580 | 89ff748d | Thomas Thrainer | |
581 | 89ff748d | Thomas Thrainer | if pause:
|
582 | 09a78e1c | Thomas Thrainer | cmd = self._cmd_gen.GenPauseSyncCmd(self.minor) |
583 | 89ff748d | Thomas Thrainer | else:
|
584 | 09a78e1c | Thomas Thrainer | cmd = self._cmd_gen.GenResumeSyncCmd(self.minor) |
585 | 89ff748d | Thomas Thrainer | |
586 | 09a78e1c | Thomas Thrainer | result = utils.RunCmd(cmd) |
587 | 89ff748d | Thomas Thrainer | if result.failed:
|
588 | 89ff748d | Thomas Thrainer | logging.error("Can't %s: %s - %s", cmd,
|
589 | 89ff748d | Thomas Thrainer | result.fail_reason, result.output) |
590 | 89ff748d | Thomas Thrainer | return not result.failed and children_result |
591 | 89ff748d | Thomas Thrainer | |
592 | 89ff748d | Thomas Thrainer | def GetProcStatus(self): |
593 | 47e0abee | Thomas Thrainer | """Return the current status data from /proc/drbd for this device.
|
594 | 47e0abee | Thomas Thrainer |
|
595 | 47e0abee | Thomas Thrainer | @rtype: DRBD8Status
|
596 | 89ff748d | Thomas Thrainer |
|
597 | 89ff748d | Thomas Thrainer | """
|
598 | 89ff748d | Thomas Thrainer | if self.minor is None: |
599 | 89ff748d | Thomas Thrainer | base.ThrowError("drbd%d: GetStats() called while not attached",
|
600 | 89ff748d | Thomas Thrainer | self._aminor)
|
601 | 47e0abee | Thomas Thrainer | info = DRBD8.GetProcInfo() |
602 | 47e0abee | Thomas Thrainer | if not info.HasMinorStatus(self.minor): |
603 | 89ff748d | Thomas Thrainer | base.ThrowError("drbd%d: can't find myself in /proc", self.minor) |
604 | 47e0abee | Thomas Thrainer | return info.GetMinorStatus(self.minor) |
605 | 89ff748d | Thomas Thrainer | |
606 | 89ff748d | Thomas Thrainer | def GetSyncStatus(self): |
607 | 89ff748d | Thomas Thrainer | """Returns the sync status of the device.
|
608 | 89ff748d | Thomas Thrainer |
|
609 | 89ff748d | Thomas Thrainer | If sync_percent is None, it means all is ok
|
610 | 89ff748d | Thomas Thrainer | If estimated_time is None, it means we can't estimate
|
611 | 89ff748d | Thomas Thrainer | the time needed, otherwise it's the time left in seconds.
|
612 | 89ff748d | Thomas Thrainer |
|
613 | 89ff748d | Thomas Thrainer | We set the is_degraded parameter to True on two conditions:
|
614 | 89ff748d | Thomas Thrainer | network not connected or local disk missing.
|
615 | 89ff748d | Thomas Thrainer |
|
616 | 89ff748d | Thomas Thrainer | We compute the ldisk parameter based on whether we have a local
|
617 | 89ff748d | Thomas Thrainer | disk or not.
|
618 | 89ff748d | Thomas Thrainer |
|
619 | 89ff748d | Thomas Thrainer | @rtype: objects.BlockDevStatus
|
620 | 89ff748d | Thomas Thrainer |
|
621 | 89ff748d | Thomas Thrainer | """
|
622 | 89ff748d | Thomas Thrainer | if self.minor is None and not self.Attach(): |
623 | 89ff748d | Thomas Thrainer | base.ThrowError("drbd%d: can't Attach() in GetSyncStatus", self._aminor) |
624 | 89ff748d | Thomas Thrainer | |
625 | 89ff748d | Thomas Thrainer | stats = self.GetProcStatus()
|
626 | 89ff748d | Thomas Thrainer | is_degraded = not stats.is_connected or not stats.is_disk_uptodate |
627 | 89ff748d | Thomas Thrainer | |
628 | 89ff748d | Thomas Thrainer | if stats.is_disk_uptodate:
|
629 | 89ff748d | Thomas Thrainer | ldisk_status = constants.LDS_OKAY |
630 | 89ff748d | Thomas Thrainer | elif stats.is_diskless:
|
631 | 89ff748d | Thomas Thrainer | ldisk_status = constants.LDS_FAULTY |
632 | 89ff748d | Thomas Thrainer | else:
|
633 | 89ff748d | Thomas Thrainer | ldisk_status = constants.LDS_UNKNOWN |
634 | 89ff748d | Thomas Thrainer | |
635 | 89ff748d | Thomas Thrainer | return objects.BlockDevStatus(dev_path=self.dev_path, |
636 | 89ff748d | Thomas Thrainer | major=self.major,
|
637 | 89ff748d | Thomas Thrainer | minor=self.minor,
|
638 | 89ff748d | Thomas Thrainer | sync_percent=stats.sync_percent, |
639 | 89ff748d | Thomas Thrainer | estimated_time=stats.est_time, |
640 | 89ff748d | Thomas Thrainer | is_degraded=is_degraded, |
641 | 89ff748d | Thomas Thrainer | ldisk_status=ldisk_status) |
642 | 89ff748d | Thomas Thrainer | |
643 | 89ff748d | Thomas Thrainer | def Open(self, force=False): |
644 | 89ff748d | Thomas Thrainer | """Make the local state primary.
|
645 | 89ff748d | Thomas Thrainer |
|
646 | 47e0abee | Thomas Thrainer | If the 'force' parameter is given, DRBD is instructed to switch the device
|
647 | 47e0abee | Thomas Thrainer | into primary mode. Since this is a potentially dangerous operation, the
|
648 | 47e0abee | Thomas Thrainer | force flag should be only given after creation, when it actually is
|
649 | 47e0abee | Thomas Thrainer | mandatory.
|
650 | 89ff748d | Thomas Thrainer |
|
651 | 89ff748d | Thomas Thrainer | """
|
652 | 89ff748d | Thomas Thrainer | if self.minor is None and not self.Attach(): |
653 | 89ff748d | Thomas Thrainer | logging.error("DRBD cannot attach to a device during open")
|
654 | 89ff748d | Thomas Thrainer | return False |
655 | 09a78e1c | Thomas Thrainer | |
656 | 09a78e1c | Thomas Thrainer | cmd = self._cmd_gen.GenPrimaryCmd(self.minor, force) |
657 | 09a78e1c | Thomas Thrainer | |
658 | 89ff748d | Thomas Thrainer | result = utils.RunCmd(cmd) |
659 | 89ff748d | Thomas Thrainer | if result.failed:
|
660 | 89ff748d | Thomas Thrainer | base.ThrowError("drbd%d: can't make drbd device primary: %s", self.minor, |
661 | 89ff748d | Thomas Thrainer | result.output) |
662 | 89ff748d | Thomas Thrainer | |
663 | 89ff748d | Thomas Thrainer | def Close(self): |
664 | 89ff748d | Thomas Thrainer | """Make the local state secondary.
|
665 | 89ff748d | Thomas Thrainer |
|
666 | 89ff748d | Thomas Thrainer | This will, of course, fail if the device is in use.
|
667 | 89ff748d | Thomas Thrainer |
|
668 | 89ff748d | Thomas Thrainer | """
|
669 | 89ff748d | Thomas Thrainer | if self.minor is None and not self.Attach(): |
670 | 89ff748d | Thomas Thrainer | base.ThrowError("drbd%d: can't Attach() in Close()", self._aminor) |
671 | 09a78e1c | Thomas Thrainer | cmd = self._cmd_gen.GenSecondaryCmd(self.minor) |
672 | 09a78e1c | Thomas Thrainer | result = utils.RunCmd(cmd) |
673 | 89ff748d | Thomas Thrainer | if result.failed:
|
674 | 89ff748d | Thomas Thrainer | base.ThrowError("drbd%d: can't switch drbd device to secondary: %s",
|
675 | 89ff748d | Thomas Thrainer | self.minor, result.output)
|
676 | 89ff748d | Thomas Thrainer | |
677 | 89ff748d | Thomas Thrainer | def DisconnectNet(self): |
678 | 89ff748d | Thomas Thrainer | """Removes network configuration.
|
679 | 89ff748d | Thomas Thrainer |
|
680 | 89ff748d | Thomas Thrainer | This method shutdowns the network side of the device.
|
681 | 89ff748d | Thomas Thrainer |
|
682 | 89ff748d | Thomas Thrainer | The method will wait up to a hardcoded timeout for the device to
|
683 | 89ff748d | Thomas Thrainer | go into standalone after the 'disconnect' command before
|
684 | 89ff748d | Thomas Thrainer | re-configuring it, as sometimes it takes a while for the
|
685 | 89ff748d | Thomas Thrainer | disconnect to actually propagate and thus we might issue a 'net'
|
686 | 89ff748d | Thomas Thrainer | command while the device is still connected. If the device will
|
687 | 89ff748d | Thomas Thrainer | still be attached to the network and we time out, we raise an
|
688 | 89ff748d | Thomas Thrainer | exception.
|
689 | 89ff748d | Thomas Thrainer |
|
690 | 89ff748d | Thomas Thrainer | """
|
691 | 89ff748d | Thomas Thrainer | if self.minor is None: |
692 | 89ff748d | Thomas Thrainer | base.ThrowError("drbd%d: disk not attached in re-attach net",
|
693 | 89ff748d | Thomas Thrainer | self._aminor)
|
694 | 89ff748d | Thomas Thrainer | |
695 | 89ff748d | Thomas Thrainer | if None in (self._lhost, self._lport, self._rhost, self._rport): |
696 | 89ff748d | Thomas Thrainer | base.ThrowError("drbd%d: DRBD disk missing network info in"
|
697 | 89ff748d | Thomas Thrainer | " DisconnectNet()", self.minor) |
698 | 89ff748d | Thomas Thrainer | |
699 | 89ff748d | Thomas Thrainer | class _DisconnectStatus: |
700 | 89ff748d | Thomas Thrainer | def __init__(self, ever_disconnected): |
701 | 89ff748d | Thomas Thrainer | self.ever_disconnected = ever_disconnected
|
702 | 89ff748d | Thomas Thrainer | |
703 | 89ff748d | Thomas Thrainer | dstatus = _DisconnectStatus(base.IgnoreError(self._ShutdownNet, self.minor)) |
704 | 89ff748d | Thomas Thrainer | |
705 | 89ff748d | Thomas Thrainer | def _WaitForDisconnect(): |
706 | 89ff748d | Thomas Thrainer | if self.GetProcStatus().is_standalone: |
707 | 89ff748d | Thomas Thrainer | return
|
708 | 89ff748d | Thomas Thrainer | |
709 | 89ff748d | Thomas Thrainer | # retry the disconnect, it seems possible that due to a well-time
|
710 | 89ff748d | Thomas Thrainer | # disconnect on the peer, my disconnect command might be ignored and
|
711 | 89ff748d | Thomas Thrainer | # forgotten
|
712 | 89ff748d | Thomas Thrainer | dstatus.ever_disconnected = \ |
713 | 89ff748d | Thomas Thrainer | base.IgnoreError(self._ShutdownNet, self.minor) or \ |
714 | 89ff748d | Thomas Thrainer | dstatus.ever_disconnected |
715 | 89ff748d | Thomas Thrainer | |
716 | 89ff748d | Thomas Thrainer | raise utils.RetryAgain()
|
717 | 89ff748d | Thomas Thrainer | |
718 | 89ff748d | Thomas Thrainer | # Keep start time
|
719 | 89ff748d | Thomas Thrainer | start_time = time.time() |
720 | 89ff748d | Thomas Thrainer | |
721 | 89ff748d | Thomas Thrainer | try:
|
722 | 89ff748d | Thomas Thrainer | # Start delay at 100 milliseconds and grow up to 2 seconds
|
723 | 89ff748d | Thomas Thrainer | utils.Retry(_WaitForDisconnect, (0.1, 1.5, 2.0), |
724 | 89ff748d | Thomas Thrainer | self._NET_RECONFIG_TIMEOUT)
|
725 | 89ff748d | Thomas Thrainer | except utils.RetryTimeout:
|
726 | 89ff748d | Thomas Thrainer | if dstatus.ever_disconnected:
|
727 | 89ff748d | Thomas Thrainer | msg = ("drbd%d: device did not react to the"
|
728 | 89ff748d | Thomas Thrainer | " 'disconnect' command in a timely manner")
|
729 | 89ff748d | Thomas Thrainer | else:
|
730 | 89ff748d | Thomas Thrainer | msg = "drbd%d: can't shutdown network, even after multiple retries"
|
731 | 89ff748d | Thomas Thrainer | |
732 | 89ff748d | Thomas Thrainer | base.ThrowError(msg, self.minor)
|
733 | 89ff748d | Thomas Thrainer | |
734 | 89ff748d | Thomas Thrainer | reconfig_time = time.time() - start_time |
735 | 89ff748d | Thomas Thrainer | if reconfig_time > (self._NET_RECONFIG_TIMEOUT * 0.25): |
736 | 89ff748d | Thomas Thrainer | logging.info("drbd%d: DisconnectNet: detach took %.3f seconds",
|
737 | 89ff748d | Thomas Thrainer | self.minor, reconfig_time)
|
738 | 89ff748d | Thomas Thrainer | |
739 | 89ff748d | Thomas Thrainer | def AttachNet(self, multimaster): |
740 | 89ff748d | Thomas Thrainer | """Reconnects the network.
|
741 | 89ff748d | Thomas Thrainer |
|
742 | 89ff748d | Thomas Thrainer | This method connects the network side of the device with a
|
743 | 89ff748d | Thomas Thrainer | specified multi-master flag. The device needs to be 'Standalone'
|
744 | 89ff748d | Thomas Thrainer | but have valid network configuration data.
|
745 | 89ff748d | Thomas Thrainer |
|
746 | 47e0abee | Thomas Thrainer | @type multimaster: boolean
|
747 | 47e0abee | Thomas Thrainer | @param multimaster: init the network in dual-primary mode
|
748 | 89ff748d | Thomas Thrainer |
|
749 | 89ff748d | Thomas Thrainer | """
|
750 | 89ff748d | Thomas Thrainer | if self.minor is None: |
751 | 89ff748d | Thomas Thrainer | base.ThrowError("drbd%d: device not attached in AttachNet", self._aminor) |
752 | 89ff748d | Thomas Thrainer | |
753 | 89ff748d | Thomas Thrainer | if None in (self._lhost, self._lport, self._rhost, self._rport): |
754 | 89ff748d | Thomas Thrainer | base.ThrowError("drbd%d: missing network info in AttachNet()", self.minor) |
755 | 89ff748d | Thomas Thrainer | |
756 | 89ff748d | Thomas Thrainer | status = self.GetProcStatus()
|
757 | 89ff748d | Thomas Thrainer | |
758 | 89ff748d | Thomas Thrainer | if not status.is_standalone: |
759 | 89ff748d | Thomas Thrainer | base.ThrowError("drbd%d: device is not standalone in AttachNet",
|
760 | 89ff748d | Thomas Thrainer | self.minor)
|
761 | 89ff748d | Thomas Thrainer | |
762 | 89ff748d | Thomas Thrainer | self._AssembleNet(self.minor, |
763 | 89ff748d | Thomas Thrainer | (self._lhost, self._lport, self._rhost, self._rport), |
764 | 65fc2388 | Thomas Thrainer | dual_pri=multimaster, hmac=constants.DRBD_HMAC_ALG, |
765 | 65fc2388 | Thomas Thrainer | secret=self._secret)
|
766 | 89ff748d | Thomas Thrainer | |
767 | 89ff748d | Thomas Thrainer | def Attach(self): |
768 | 89ff748d | Thomas Thrainer | """Check if our minor is configured.
|
769 | 89ff748d | Thomas Thrainer |
|
770 | 89ff748d | Thomas Thrainer | This doesn't do any device configurations - it only checks if the
|
771 | 89ff748d | Thomas Thrainer | minor is in a state different from Unconfigured.
|
772 | 89ff748d | Thomas Thrainer |
|
773 | 89ff748d | Thomas Thrainer | Note that this function will not change the state of the system in
|
774 | 89ff748d | Thomas Thrainer | any way (except in case of side-effects caused by reading from
|
775 | 89ff748d | Thomas Thrainer | /proc).
|
776 | 89ff748d | Thomas Thrainer |
|
777 | 89ff748d | Thomas Thrainer | """
|
778 | 47e0abee | Thomas Thrainer | used_devs = DRBD8.GetUsedDevs() |
779 | 89ff748d | Thomas Thrainer | if self._aminor in used_devs: |
780 | 89ff748d | Thomas Thrainer | minor = self._aminor
|
781 | 89ff748d | Thomas Thrainer | else:
|
782 | 89ff748d | Thomas Thrainer | minor = None
|
783 | 89ff748d | Thomas Thrainer | |
784 | 89ff748d | Thomas Thrainer | self._SetFromMinor(minor)
|
785 | 89ff748d | Thomas Thrainer | return minor is not None |
786 | 89ff748d | Thomas Thrainer | |
787 | 89ff748d | Thomas Thrainer | def Assemble(self): |
788 | 89ff748d | Thomas Thrainer | """Assemble the drbd.
|
789 | 89ff748d | Thomas Thrainer |
|
790 | 89ff748d | Thomas Thrainer | Method:
|
791 | 89ff748d | Thomas Thrainer | - if we have a configured device, we try to ensure that it matches
|
792 | 89ff748d | Thomas Thrainer | our config
|
793 | 89ff748d | Thomas Thrainer | - if not, we create it from zero
|
794 | 89ff748d | Thomas Thrainer | - anyway, set the device parameters
|
795 | 89ff748d | Thomas Thrainer |
|
796 | 89ff748d | Thomas Thrainer | """
|
797 | 239364d0 | Thomas Thrainer | super(DRBD8Dev, self).Assemble() |
798 | 89ff748d | Thomas Thrainer | |
799 | 89ff748d | Thomas Thrainer | self.Attach()
|
800 | 89ff748d | Thomas Thrainer | if self.minor is None: |
801 | 89ff748d | Thomas Thrainer | # local device completely unconfigured
|
802 | 89ff748d | Thomas Thrainer | self._FastAssemble()
|
803 | 89ff748d | Thomas Thrainer | else:
|
804 | 89ff748d | Thomas Thrainer | # we have to recheck the local and network status and try to fix
|
805 | 89ff748d | Thomas Thrainer | # the device
|
806 | 89ff748d | Thomas Thrainer | self._SlowAssemble()
|
807 | 89ff748d | Thomas Thrainer | |
808 | 89ff748d | Thomas Thrainer | sync_errors = self.SetSyncParams(self.params) |
809 | 89ff748d | Thomas Thrainer | if sync_errors:
|
810 | 89ff748d | Thomas Thrainer | base.ThrowError("drbd%d: can't set the synchronization parameters: %s" %
|
811 | 89ff748d | Thomas Thrainer | (self.minor, utils.CommaJoin(sync_errors)))
|
812 | 89ff748d | Thomas Thrainer | |
813 | 89ff748d | Thomas Thrainer | def _SlowAssemble(self): |
814 | 89ff748d | Thomas Thrainer | """Assembles the DRBD device from a (partially) configured device.
|
815 | 89ff748d | Thomas Thrainer |
|
816 | 89ff748d | Thomas Thrainer | In case of partially attached (local device matches but no network
|
817 | 89ff748d | Thomas Thrainer | setup), we perform the network attach. If successful, we re-test
|
818 | 89ff748d | Thomas Thrainer | the attach if can return success.
|
819 | 89ff748d | Thomas Thrainer |
|
820 | 89ff748d | Thomas Thrainer | """
|
821 | 89ff748d | Thomas Thrainer | # TODO: Rewrite to not use a for loop just because there is 'break'
|
822 | 89ff748d | Thomas Thrainer | # pylint: disable=W0631
|
823 | 89ff748d | Thomas Thrainer | net_data = (self._lhost, self._lport, self._rhost, self._rport) |
824 | 89ff748d | Thomas Thrainer | for minor in (self._aminor,): |
825 | 27c7d9c3 | Thomas Thrainer | info = self._GetShowInfo(minor)
|
826 | 89ff748d | Thomas Thrainer | match_l = self._MatchesLocal(info)
|
827 | 89ff748d | Thomas Thrainer | match_r = self._MatchesNet(info)
|
828 | 89ff748d | Thomas Thrainer | |
829 | 89ff748d | Thomas Thrainer | if match_l and match_r: |
830 | 89ff748d | Thomas Thrainer | # everything matches
|
831 | 89ff748d | Thomas Thrainer | break
|
832 | 89ff748d | Thomas Thrainer | |
833 | 89ff748d | Thomas Thrainer | if match_l and not match_r and "local_addr" not in info: |
834 | 89ff748d | Thomas Thrainer | # disk matches, but not attached to network, attach and recheck
|
835 | 65fc2388 | Thomas Thrainer | self._AssembleNet(minor, net_data, hmac=constants.DRBD_HMAC_ALG,
|
836 | 65fc2388 | Thomas Thrainer | secret=self._secret)
|
837 | 27c7d9c3 | Thomas Thrainer | if self._MatchesNet(self._GetShowInfo(minor)): |
838 | 89ff748d | Thomas Thrainer | break
|
839 | 89ff748d | Thomas Thrainer | else:
|
840 | 89ff748d | Thomas Thrainer | base.ThrowError("drbd%d: network attach successful, but 'drbdsetup"
|
841 | 89ff748d | Thomas Thrainer | " show' disagrees", minor)
|
842 | 89ff748d | Thomas Thrainer | |
843 | 89ff748d | Thomas Thrainer | if match_r and "local_dev" not in info: |
844 | 89ff748d | Thomas Thrainer | # no local disk, but network attached and it matches
|
845 | 89ff748d | Thomas Thrainer | self._AssembleLocal(minor, self._children[0].dev_path, |
846 | 89ff748d | Thomas Thrainer | self._children[1].dev_path, self.size) |
847 | 085b8e24 | Thomas Thrainer | if self._MatchesLocal(self._GetShowInfo(minor)): |
848 | 89ff748d | Thomas Thrainer | break
|
849 | 89ff748d | Thomas Thrainer | else:
|
850 | 89ff748d | Thomas Thrainer | base.ThrowError("drbd%d: disk attach successful, but 'drbdsetup"
|
851 | 89ff748d | Thomas Thrainer | " show' disagrees", minor)
|
852 | 89ff748d | Thomas Thrainer | |
853 | 89ff748d | Thomas Thrainer | # this case must be considered only if we actually have local
|
854 | 89ff748d | Thomas Thrainer | # storage, i.e. not in diskless mode, because all diskless
|
855 | 89ff748d | Thomas Thrainer | # devices are equal from the point of view of local
|
856 | 89ff748d | Thomas Thrainer | # configuration
|
857 | 89ff748d | Thomas Thrainer | if (match_l and "local_dev" in info and |
858 | 89ff748d | Thomas Thrainer | not match_r and "local_addr" in info): |
859 | 89ff748d | Thomas Thrainer | # strange case - the device network part points to somewhere
|
860 | 89ff748d | Thomas Thrainer | # else, even though its local storage is ours; as we own the
|
861 | 89ff748d | Thomas Thrainer | # drbd space, we try to disconnect from the remote peer and
|
862 | 89ff748d | Thomas Thrainer | # reconnect to our correct one
|
863 | 89ff748d | Thomas Thrainer | try:
|
864 | 89ff748d | Thomas Thrainer | self._ShutdownNet(minor)
|
865 | 89ff748d | Thomas Thrainer | except errors.BlockDeviceError, err:
|
866 | 89ff748d | Thomas Thrainer | base.ThrowError("drbd%d: device has correct local storage, wrong"
|
867 | 89ff748d | Thomas Thrainer | " remote peer and is unable to disconnect in order"
|
868 | 89ff748d | Thomas Thrainer | " to attach to the correct peer: %s", minor, str(err)) |
869 | 89ff748d | Thomas Thrainer | # note: _AssembleNet also handles the case when we don't want
|
870 | 89ff748d | Thomas Thrainer | # local storage (i.e. one or more of the _[lr](host|port) is
|
871 | 89ff748d | Thomas Thrainer | # None)
|
872 | 65fc2388 | Thomas Thrainer | self._AssembleNet(minor, net_data, hmac=constants.DRBD_HMAC_ALG,
|
873 | 65fc2388 | Thomas Thrainer | secret=self._secret)
|
874 | 27c7d9c3 | Thomas Thrainer | if self._MatchesNet(self._GetShowInfo(minor)): |
875 | 89ff748d | Thomas Thrainer | break
|
876 | 89ff748d | Thomas Thrainer | else:
|
877 | 89ff748d | Thomas Thrainer | base.ThrowError("drbd%d: network attach successful, but 'drbdsetup"
|
878 | 89ff748d | Thomas Thrainer | " show' disagrees", minor)
|
879 | 89ff748d | Thomas Thrainer | |
880 | 89ff748d | Thomas Thrainer | else:
|
881 | 89ff748d | Thomas Thrainer | minor = None
|
882 | 89ff748d | Thomas Thrainer | |
883 | 89ff748d | Thomas Thrainer | self._SetFromMinor(minor)
|
884 | 89ff748d | Thomas Thrainer | if minor is None: |
885 | 89ff748d | Thomas Thrainer | base.ThrowError("drbd%d: cannot activate, unknown or unhandled reason",
|
886 | 89ff748d | Thomas Thrainer | self._aminor)
|
887 | 89ff748d | Thomas Thrainer | |
888 | 89ff748d | Thomas Thrainer | def _FastAssemble(self): |
889 | 89ff748d | Thomas Thrainer | """Assemble the drbd device from zero.
|
890 | 89ff748d | Thomas Thrainer |
|
891 | 89ff748d | Thomas Thrainer | This is run when in Assemble we detect our minor is unused.
|
892 | 89ff748d | Thomas Thrainer |
|
893 | 89ff748d | Thomas Thrainer | """
|
894 | 89ff748d | Thomas Thrainer | minor = self._aminor
|
895 | 89ff748d | Thomas Thrainer | if self._children and self._children[0] and self._children[1]: |
896 | 89ff748d | Thomas Thrainer | self._AssembleLocal(minor, self._children[0].dev_path, |
897 | 89ff748d | Thomas Thrainer | self._children[1].dev_path, self.size) |
898 | 89ff748d | Thomas Thrainer | if self._lhost and self._lport and self._rhost and self._rport: |
899 | 89ff748d | Thomas Thrainer | self._AssembleNet(minor,
|
900 | 89ff748d | Thomas Thrainer | (self._lhost, self._lport, self._rhost, self._rport), |
901 | 89ff748d | Thomas Thrainer | hmac=constants.DRBD_HMAC_ALG, secret=self._secret)
|
902 | 89ff748d | Thomas Thrainer | self._SetFromMinor(minor)
|
903 | 89ff748d | Thomas Thrainer | |
904 | 09a78e1c | Thomas Thrainer | def _ShutdownLocal(self, minor): |
905 | 89ff748d | Thomas Thrainer | """Detach from the local device.
|
906 | 89ff748d | Thomas Thrainer |
|
907 | 89ff748d | Thomas Thrainer | I/Os will continue to be served from the remote device. If we
|
908 | 89ff748d | Thomas Thrainer | don't have a remote device, this operation will fail.
|
909 | 89ff748d | Thomas Thrainer |
|
910 | 47e0abee | Thomas Thrainer | @type minor: int
|
911 | 47e0abee | Thomas Thrainer | @param minor: the device to detach from the local device
|
912 | 47e0abee | Thomas Thrainer |
|
913 | 89ff748d | Thomas Thrainer | """
|
914 | 09a78e1c | Thomas Thrainer | cmd = self._cmd_gen.GenDetachCmd(minor)
|
915 | 09a78e1c | Thomas Thrainer | result = utils.RunCmd(cmd) |
916 | 89ff748d | Thomas Thrainer | if result.failed:
|
917 | 89ff748d | Thomas Thrainer | base.ThrowError("drbd%d: can't detach local disk: %s",
|
918 | 89ff748d | Thomas Thrainer | minor, result.output) |
919 | 89ff748d | Thomas Thrainer | |
920 | 09a78e1c | Thomas Thrainer | def _ShutdownNet(self, minor): |
921 | 89ff748d | Thomas Thrainer | """Disconnect from the remote peer.
|
922 | 89ff748d | Thomas Thrainer |
|
923 | 89ff748d | Thomas Thrainer | This fails if we don't have a local device.
|
924 | 89ff748d | Thomas Thrainer |
|
925 | 47e0abee | Thomas Thrainer | @type minor: boolean
|
926 | 47e0abee | Thomas Thrainer | @param minor: the device to disconnect from the remote peer
|
927 | 47e0abee | Thomas Thrainer |
|
928 | 89ff748d | Thomas Thrainer | """
|
929 | daec28a7 | Thomas Thrainer | family = self._GetNetFamily(minor, self._lhost, self._rhost) |
930 | daec28a7 | Thomas Thrainer | cmd = self._cmd_gen.GenDisconnectCmd(minor, family,
|
931 | daec28a7 | Thomas Thrainer | self._lhost, self._lport, |
932 | daec28a7 | Thomas Thrainer | self._rhost, self._rport) |
933 | 09a78e1c | Thomas Thrainer | result = utils.RunCmd(cmd) |
934 | 89ff748d | Thomas Thrainer | if result.failed:
|
935 | 89ff748d | Thomas Thrainer | base.ThrowError("drbd%d: can't shutdown network: %s",
|
936 | 89ff748d | Thomas Thrainer | minor, result.output) |
937 | 89ff748d | Thomas Thrainer | |
938 | 89ff748d | Thomas Thrainer | def Shutdown(self): |
939 | 89ff748d | Thomas Thrainer | """Shutdown the DRBD device.
|
940 | 89ff748d | Thomas Thrainer |
|
941 | 89ff748d | Thomas Thrainer | """
|
942 | 89ff748d | Thomas Thrainer | if self.minor is None and not self.Attach(): |
943 | 89ff748d | Thomas Thrainer | logging.info("drbd%d: not attached during Shutdown()", self._aminor) |
944 | 89ff748d | Thomas Thrainer | return
|
945 | d0d7d7cf | Thomas Thrainer | |
946 | d0d7d7cf | Thomas Thrainer | try:
|
947 | d0d7d7cf | Thomas Thrainer | DRBD8.ShutdownAll(self.minor)
|
948 | d0d7d7cf | Thomas Thrainer | finally:
|
949 | d0d7d7cf | Thomas Thrainer | self.minor = None |
950 | d0d7d7cf | Thomas Thrainer | self.dev_path = None |
951 | 89ff748d | Thomas Thrainer | |
952 | 89ff748d | Thomas Thrainer | def Remove(self): |
953 | 89ff748d | Thomas Thrainer | """Stub remove for DRBD devices.
|
954 | 89ff748d | Thomas Thrainer |
|
955 | 89ff748d | Thomas Thrainer | """
|
956 | 89ff748d | Thomas Thrainer | self.Shutdown()
|
957 | 89ff748d | Thomas Thrainer | |
958 | fd300bc7 | Thomas Thrainer | def Rename(self, new_id): |
959 | fd300bc7 | Thomas Thrainer | """Rename a device.
|
960 | fd300bc7 | Thomas Thrainer |
|
961 | fd300bc7 | Thomas Thrainer | This is not supported for drbd devices.
|
962 | fd300bc7 | Thomas Thrainer |
|
963 | fd300bc7 | Thomas Thrainer | """
|
964 | fd300bc7 | Thomas Thrainer | raise errors.ProgrammerError("Can't rename a drbd device") |
965 | fd300bc7 | Thomas Thrainer | |
966 | be9150ea | Bernardo Dal Seno | def Grow(self, amount, dryrun, backingstore, excl_stor): |
967 | 47e0abee | Thomas Thrainer | """Resize the DRBD device and its backing storage.
|
968 | 47e0abee | Thomas Thrainer |
|
969 | 47e0abee | Thomas Thrainer | See L{BlockDev.Grow} for parameter description.
|
970 | 47e0abee | Thomas Thrainer |
|
971 | 47e0abee | Thomas Thrainer | """
|
972 | 47e0abee | Thomas Thrainer | if self.minor is None: |
973 | 47e0abee | Thomas Thrainer | base.ThrowError("drbd%d: Grow called while not attached", self._aminor) |
974 | 47e0abee | Thomas Thrainer | if len(self._children) != 2 or None in self._children: |
975 | 47e0abee | Thomas Thrainer | base.ThrowError("drbd%d: cannot grow diskless device", self.minor) |
976 | be9150ea | Bernardo Dal Seno | self._children[0].Grow(amount, dryrun, backingstore, excl_stor) |
977 | 47e0abee | Thomas Thrainer | if dryrun or backingstore: |
978 | 47e0abee | Thomas Thrainer | # DRBD does not support dry-run mode and is not backing storage,
|
979 | 47e0abee | Thomas Thrainer | # so we'll return here
|
980 | 47e0abee | Thomas Thrainer | return
|
981 | 47e0abee | Thomas Thrainer | cmd = self._cmd_gen.GenResizeCmd(self.minor, self.size + amount) |
982 | 47e0abee | Thomas Thrainer | result = utils.RunCmd(cmd) |
983 | 47e0abee | Thomas Thrainer | if result.failed:
|
984 | 47e0abee | Thomas Thrainer | base.ThrowError("drbd%d: resize failed: %s", self.minor, result.output) |
985 | 47e0abee | Thomas Thrainer | |
986 | 47e0abee | Thomas Thrainer | @classmethod
|
987 | 47e0abee | Thomas Thrainer | def _InitMeta(cls, minor, dev_path): |
988 | 47e0abee | Thomas Thrainer | """Initialize a meta device.
|
989 | 47e0abee | Thomas Thrainer |
|
990 | 47e0abee | Thomas Thrainer | This will not work if the given minor is in use.
|
991 | 47e0abee | Thomas Thrainer |
|
992 | 47e0abee | Thomas Thrainer | @type minor: int
|
993 | 47e0abee | Thomas Thrainer | @param minor: the DRBD minor whose (future) meta device should be
|
994 | 47e0abee | Thomas Thrainer | initialized
|
995 | 47e0abee | Thomas Thrainer | @type dev_path: string
|
996 | 47e0abee | Thomas Thrainer | @param dev_path: path to the meta device to initialize
|
997 | 47e0abee | Thomas Thrainer |
|
998 | 47e0abee | Thomas Thrainer | """
|
999 | 47e0abee | Thomas Thrainer | # Zero the metadata first, in order to make sure drbdmeta doesn't
|
1000 | 47e0abee | Thomas Thrainer | # try to auto-detect existing filesystems or similar (see
|
1001 | 47e0abee | Thomas Thrainer | # http://code.google.com/p/ganeti/issues/detail?id=182); we only
|
1002 | 47e0abee | Thomas Thrainer | # care about the first 128MB of data in the device, even though it
|
1003 | 47e0abee | Thomas Thrainer | # can be bigger
|
1004 | 47e0abee | Thomas Thrainer | result = utils.RunCmd([constants.DD_CMD, |
1005 | 47e0abee | Thomas Thrainer | "if=/dev/zero", "of=%s" % dev_path, |
1006 | 47e0abee | Thomas Thrainer | "bs=1048576", "count=128", "oflag=direct"]) |
1007 | 47e0abee | Thomas Thrainer | if result.failed:
|
1008 | 47e0abee | Thomas Thrainer | base.ThrowError("Can't wipe the meta device: %s", result.output)
|
1009 | 47e0abee | Thomas Thrainer | |
1010 | 47e0abee | Thomas Thrainer | info = DRBD8.GetProcInfo() |
1011 | 47e0abee | Thomas Thrainer | cmd_gen = DRBD8.GetCmdGenerator(info) |
1012 | 47e0abee | Thomas Thrainer | cmd = cmd_gen.GenInitMetaCmd(minor, dev_path) |
1013 | 47e0abee | Thomas Thrainer | |
1014 | 47e0abee | Thomas Thrainer | result = utils.RunCmd(cmd) |
1015 | 47e0abee | Thomas Thrainer | if result.failed:
|
1016 | 47e0abee | Thomas Thrainer | base.ThrowError("Can't initialize meta device: %s", result.output)
|
1017 | 47e0abee | Thomas Thrainer | |
1018 | 89ff748d | Thomas Thrainer | @classmethod
|
1019 | 0c3d9c7c | Thomas Thrainer | def Create(cls, unique_id, children, size, spindles, params, excl_stor, |
1020 | 0c3d9c7c | Thomas Thrainer | dyn_params): |
1021 | 89ff748d | Thomas Thrainer | """Create a new DRBD8 device.
|
1022 | 89ff748d | Thomas Thrainer |
|
1023 | 89ff748d | Thomas Thrainer | Since DRBD devices are not created per se, just assembled, this
|
1024 | 89ff748d | Thomas Thrainer | function only initializes the metadata.
|
1025 | 89ff748d | Thomas Thrainer |
|
1026 | 89ff748d | Thomas Thrainer | """
|
1027 | 89ff748d | Thomas Thrainer | if len(children) != 2: |
1028 | 89ff748d | Thomas Thrainer | raise errors.ProgrammerError("Invalid setup for the drbd device") |
1029 | 89ff748d | Thomas Thrainer | if excl_stor:
|
1030 | 89ff748d | Thomas Thrainer | raise errors.ProgrammerError("DRBD device requested with" |
1031 | 89ff748d | Thomas Thrainer | " exclusive_storage")
|
1032 | 0c3d9c7c | Thomas Thrainer | if constants.DDP_LOCAL_MINOR not in dyn_params: |
1033 | 0c3d9c7c | Thomas Thrainer | raise errors.ProgrammerError("Invalid dynamic params for drbd device %s" |
1034 | 0c3d9c7c | Thomas Thrainer | % dyn_params) |
1035 | 89ff748d | Thomas Thrainer | # check that the minor is unused
|
1036 | 0c3d9c7c | Thomas Thrainer | aminor = dyn_params[constants.DDP_LOCAL_MINOR] |
1037 | 2fe690f1 | Thomas Thrainer | |
1038 | 47e0abee | Thomas Thrainer | info = DRBD8.GetProcInfo() |
1039 | 47e0abee | Thomas Thrainer | if info.HasMinorStatus(aminor):
|
1040 | 47e0abee | Thomas Thrainer | status = info.GetMinorStatus(aminor) |
1041 | 89ff748d | Thomas Thrainer | in_use = status.is_in_use |
1042 | 89ff748d | Thomas Thrainer | else:
|
1043 | 89ff748d | Thomas Thrainer | in_use = False
|
1044 | 89ff748d | Thomas Thrainer | if in_use:
|
1045 | 89ff748d | Thomas Thrainer | base.ThrowError("drbd%d: minor is already in use at Create() time",
|
1046 | 89ff748d | Thomas Thrainer | aminor) |
1047 | 89ff748d | Thomas Thrainer | meta = children[1]
|
1048 | 89ff748d | Thomas Thrainer | meta.Assemble() |
1049 | 89ff748d | Thomas Thrainer | if not meta.Attach(): |
1050 | 89ff748d | Thomas Thrainer | base.ThrowError("drbd%d: can't attach to meta device '%s'",
|
1051 | 89ff748d | Thomas Thrainer | aminor, meta) |
1052 | 89ff748d | Thomas Thrainer | cls._CheckMetaSize(meta.dev_path) |
1053 | 89ff748d | Thomas Thrainer | cls._InitMeta(aminor, meta.dev_path) |
1054 | 0c3d9c7c | Thomas Thrainer | return cls(unique_id, children, size, params, dyn_params)
|
1055 | 89ff748d | Thomas Thrainer | |
1056 | 89ff748d | Thomas Thrainer | |
1057 | 89ff748d | Thomas Thrainer | def _CanReadDevice(path): |
1058 | 89ff748d | Thomas Thrainer | """Check if we can read from the given device.
|
1059 | 89ff748d | Thomas Thrainer |
|
1060 | 89ff748d | Thomas Thrainer | This tries to read the first 128k of the device.
|
1061 | 89ff748d | Thomas Thrainer |
|
1062 | 47e0abee | Thomas Thrainer | @type path: string
|
1063 | 47e0abee | Thomas Thrainer |
|
1064 | 89ff748d | Thomas Thrainer | """
|
1065 | 89ff748d | Thomas Thrainer | try:
|
1066 | 89ff748d | Thomas Thrainer | utils.ReadFile(path, size=_DEVICE_READ_SIZE) |
1067 | 89ff748d | Thomas Thrainer | return True |
1068 | 89ff748d | Thomas Thrainer | except EnvironmentError: |
1069 | 89ff748d | Thomas Thrainer | logging.warning("Can't read from device %s", path, exc_info=True) |
1070 | 89ff748d | Thomas Thrainer | return False |