Synnefo » snf-ganeti

	test/py/ganeti.utils.lvm_unittest.py \

    @param size: LV size in MiB

# Copyright (C) 2006, 2007, 2010, 2012, 2013 Google Inc.

import random

from ganeti import compat

from ganeti import errors

from ganeti import objects

class TestExclusiveStoragePvs(unittest.TestCase):

  """Test cases for functions dealing with LVM PV and exclusive storage"""

  # Allowance for rounding

  _EPS = 1e-4

  _MARGIN = constants.PART_MARGIN + constants.PART_RESERVED + _EPS

  @staticmethod

  def _GenerateRandomPvInfo(rnd, name, vg):

    # Granularity is .01 MiB

    size = rnd.randint(1024 * 100, 10 * 1024 * 1024 * 100)

    if rnd.choice([False, True]):

      free = float(rnd.randint(0, size)) / 100.0

    else:

      free = float(size) / 100.0

    size = float(size) / 100.0

    attr = "a-"

    return objects.LvmPvInfo(name=name, vg_name=vg, size=size, free=free,

                             attributes=attr)

  def testGetStdPvSize(self):

    """Test cases for bdev.LogicalVolume._GetStdPvSize()"""

    rnd = random.Random(9517)

    for _ in range(0, 50):

      # Identical volumes

      pvi = self._GenerateRandomPvInfo(rnd, "disk", "myvg")

      onesize = bdev.LogicalVolume._GetStdPvSize([pvi])

      self.assertTrue(onesize <= pvi.size)

      self.assertTrue(onesize > pvi.size * (1 - self._MARGIN))

      for length in range(2, 10):

        n_size = bdev.LogicalVolume._GetStdPvSize([pvi] * length)

        self.assertEqual(onesize, n_size)

      # Mixed volumes

      for length in range(1, 10):

        pvlist = [self._GenerateRandomPvInfo(rnd, "disk", "myvg")

                  for _ in range(0, length)]

        std_size = bdev.LogicalVolume._GetStdPvSize(pvlist)

        self.assertTrue(compat.all(std_size <= pvi.size for pvi in pvlist))

        self.assertTrue(compat.any(std_size > pvi.size * (1 - self._MARGIN)

                                   for pvi in pvlist))

        pvlist.append(pvlist[0])

        p1_size = bdev.LogicalVolume._GetStdPvSize(pvlist)

        self.assertEqual(std_size, p1_size)

  def testComputeNumPvs(self):

    """Test cases for bdev.LogicalVolume._ComputeNumPvs()"""

    rnd = random.Random(8067)

    for _ in range(0, 1000):

      pvlist = [self._GenerateRandomPvInfo(rnd, "disk", "myvg")]

      lv_size = float(rnd.randint(10 * 100, 1024 * 1024 * 100)) / 100.0

      num_pv = bdev.LogicalVolume._ComputeNumPvs(lv_size, pvlist)

      std_size = bdev.LogicalVolume._GetStdPvSize(pvlist)

      self.assertTrue(num_pv >= 1)

      self.assertTrue(num_pv * std_size >= lv_size)

      self.assertTrue((num_pv - 1) * std_size < lv_size * (1 + self._EPS))

  def testGetEmptyPvNames(self):

    """Test cases for bdev.LogicalVolume._GetEmptyPvNames()"""

    rnd = random.Random(21126)

    for _ in range(0, 100):

      num_pvs = rnd.randint(1, 20)

      pvlist = [self._GenerateRandomPvInfo(rnd, "disk%d" % n, "myvg")

                for n in range(0, num_pvs)]

      for num_req in range(1, num_pvs + 2):

        epvs = bdev.LogicalVolume._GetEmptyPvNames(pvlist, num_req)

        epvs_set = compat.UniqueFrozenset(epvs)

        if len(epvs) > 1:

          self.assertEqual(len(epvs), len(epvs_set))

        for pvi in pvlist:

          if pvi.name in epvs_set:

            self.assertEqual(pvi.size, pvi.free)

          else:

            # There should be no remaining empty PV when less than the

            # requeste number of PVs has been returned

            self.assertTrue(len(epvs) == num_req or pvi.free != pvi.size)

#!/usr/bin/python

#

# Copyright (C) 2013 Google Inc.

#

# This program is free software; you can redistribute it and/or modify

# it under the terms of the GNU General Public License as published by

# the Free Software Foundation; either version 2 of the License, or

# (at your option) any later version.

#

# This program is distributed in the hope that it will be useful, but

# WITHOUT ANY WARRANTY; without even the implied warranty of

# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

# General Public License for more details.

#

# You should have received a copy of the GNU General Public License

# along with this program; if not, write to the Free Software

# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA

# 02110-1301, USA.

"""Script for testing ganeti.utils.lvm"""

import unittest

from ganeti import constants

from ganeti import utils

from ganeti.objects import LvmPvInfo

import testutils

class TestLvmExclusiveCheckNodePvs(unittest.TestCase):

  """Test cases for LvmExclusiveCheckNodePvs()"""

  _VG = "vg"

  _SMALL_PV = LvmPvInfo(name="small", vg_name=_VG, size=100e3, free=40e3,

                        attributes="a-")

  _MED_PV = LvmPvInfo(name="medium", vg_name=_VG, size=400e3, free=40e3,

                      attributes="a-")

  _BIG_PV = LvmPvInfo(name="big", vg_name=_VG, size=1e6, free=400e3,

                      attributes="a-")

  # Allowance for rounding

  _EPS = 1e-4

  def testOnePv(self):

    errmsgs = utils.LvmExclusiveCheckNodePvs([self._MED_PV])

    self.assertFalse(errmsgs)

  def testEqualPvs(self):

    errmsgs = utils.LvmExclusiveCheckNodePvs([self._MED_PV] * 2)

    self.assertFalse(errmsgs)

    errmsgs = utils.LvmExclusiveCheckNodePvs([self._SMALL_PV] * 3)

    self.assertFalse(errmsgs)

  def testTooDifferentPvs(self):

    errmsgs = utils.LvmExclusiveCheckNodePvs([self._MED_PV, self._BIG_PV])

    self.assertEqual(len(errmsgs), 1)

    errmsgs = utils.LvmExclusiveCheckNodePvs([self._MED_PV, self._SMALL_PV])

    self.assertEqual(len(errmsgs), 1)

  def testBoundarySizeCases(self):

    medpv1 = self._MED_PV.Copy()

    medpv2 = self._MED_PV.Copy()

    errmsgs = utils.LvmExclusiveCheckNodePvs([medpv1, medpv2, self._MED_PV])

    self.assertFalse(errmsgs)

    # Just within the margins

    medpv1.size = self._MED_PV.size * (1 - constants.PART_MARGIN + self._EPS)

    medpv2.size = self._MED_PV.size * (1 + constants.PART_MARGIN - self._EPS)

    errmsgs = utils.LvmExclusiveCheckNodePvs([medpv1, medpv2, self._MED_PV])

    self.assertFalse(errmsgs)

    # Just outside the margins

    medpv1.size = self._MED_PV.size * (1 - constants.PART_MARGIN - self._EPS)

    medpv2.size = self._MED_PV.size * (1 + constants.PART_MARGIN)

    errmsgs = utils.LvmExclusiveCheckNodePvs([medpv1, medpv2, self._MED_PV])

    self.assertTrue(errmsgs)

    medpv1.size = self._MED_PV.size * (1 - constants.PART_MARGIN)

    medpv2.size = self._MED_PV.size * (1 + constants.PART_MARGIN + self._EPS)

    errmsgs = utils.LvmExclusiveCheckNodePvs([medpv1, medpv2, self._MED_PV])

    self.assertTrue(errmsgs)

if __name__ == "__main__":

  testutils.GanetiTestProgram()