115 |
115 |
the instance sees the same virtual drive in all cases, the node-level
|
116 |
116 |
configuration varies between them.
|
117 |
117 |
|
118 |
|
There are five disk templates you can choose from:
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|
118 |
There are several disk templates you can choose from:
|
119 |
119 |
|
120 |
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diskless
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|
120 |
``diskless``
|
121 |
121 |
The instance has no disks. Only used for special purpose operating
|
122 |
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systems or for testing.
|
123 |
123 |
|
124 |
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file
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|
124 |
``file`` *****
|
125 |
125 |
The instance will use plain files as backend for its disks. No
|
126 |
126 |
redundancy is provided, and this is somewhat more difficult to
|
127 |
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configure for high performance. Note that for security reasons the
|
128 |
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file storage directory must be listed under
|
129 |
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``/etc/ganeti/file-storage-paths``, and that file is not copied
|
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automatically to all nodes by Ganeti. The format of that file is a
|
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newline-separated list of directories.
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|
127 |
configure for high performance.
|
132 |
128 |
|
133 |
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sharedfile
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|
129 |
``sharedfile`` *****
|
134 |
130 |
The instance will use plain files as backend, but Ganeti assumes that
|
135 |
131 |
those files will be available and in sync automatically on all nodes.
|
136 |
132 |
This allows live migration and failover of instances using this
|
137 |
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method. As for ``file`` the file storage directory must be listed under
|
138 |
|
``/etc/ganeti/file-storage-paths`` or ganeti will refuse to create
|
139 |
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instances under it.
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|
133 |
method.
|
140 |
134 |
|
141 |
|
plain
|
|
135 |
``plain``
|
142 |
136 |
The instance will use LVM devices as backend for its disks. No
|
143 |
137 |
redundancy is provided.
|
144 |
138 |
|
145 |
|
drbd
|
|
139 |
``drbd``
|
146 |
140 |
.. note:: This is only valid for multi-node clusters using DRBD 8.0+
|
147 |
141 |
|
148 |
142 |
A mirror is set between the local node and a remote one, which must be
|
... | ... | |
154 |
148 |
DRBD stacked setup is not fully symmetric and as such it is
|
155 |
149 |
not working with live migration.
|
156 |
150 |
|
157 |
|
rbd
|
|
151 |
``rbd``
|
158 |
152 |
The instance will use Volumes inside a RADOS cluster as backend for its
|
159 |
153 |
disks. It will access them using the RADOS block device (RBD).
|
160 |
154 |
|
161 |
|
ext
|
|
155 |
``gluster`` *****
|
|
156 |
The instance will use a Gluster volume for instance storage. Disk
|
|
157 |
images will be stored in the top-level ``ganeti/`` directory of the
|
|
158 |
volume. This directory will be created automatically for you.
|
|
159 |
|
|
160 |
``ext``
|
162 |
161 |
The instance will use an external storage provider. See
|
163 |
162 |
:manpage:`ganeti-extstorage-interface(7)` for how to implement one.
|
164 |
163 |
|
|
164 |
.. note::
|
|
165 |
Disk templates marked with an asterisk require Ganeti to access the
|
|
166 |
file system. Ganeti will refuse to do so unless you whitelist the
|
|
167 |
relevant paths in :pyeval:`pathutils.FILE_STORAGE_PATHS_FILE`.
|
|
168 |
|
|
169 |
The default paths used by Ganeti are:
|
|
170 |
|
|
171 |
=============== ===================================================
|
|
172 |
Disk template Default path
|
|
173 |
=============== ===================================================
|
|
174 |
``file`` :pyeval:`pathutils.DEFAULT_FILE_STORAGE_DIR`
|
|
175 |
``sharedfile`` :pyeval:`pathutils.DEFAULT_SHARED_FILE_STORAGE_DIR`
|
|
176 |
``gluster`` :pyeval:`pathutils.DEFAULT_GLUSTER_STORAGE_DIR`
|
|
177 |
=============== ===================================================
|
|
178 |
|
|
179 |
Those paths can be changed at ``gnt-cluster init`` time. See
|
|
180 |
:manpage:`gnt-cluster(8)` for details.
|
|
181 |
|
165 |
182 |
|
166 |
183 |
IAllocator
|
167 |
184 |
~~~~~~~~~~
|