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the instance sees the same virtual drive in all cases, the node-level |
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configuration varies between them. |
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There are five disk templates you can choose from:
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There are several disk templates you can choose from:
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diskless
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``diskless``
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The instance has no disks. Only used for special purpose operating |
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systems or for testing. |
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file
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``file`` *****
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The instance will use plain files as backend for its disks. No |
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redundancy is provided, and this is somewhat more difficult to |
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configure for high performance. Note that for security reasons the |
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file storage directory must be listed under |
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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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configure for high performance. |
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sharedfile
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``sharedfile`` *****
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The instance will use plain files as backend, but Ganeti assumes that |
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those files will be available and in sync automatically on all nodes. |
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This allows live migration and failover of instances using this |
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method. As for ``file`` the file storage directory must be listed under |
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``/etc/ganeti/file-storage-paths`` or ganeti will refuse to create |
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instances under it. |
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method. |
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plain
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``plain``
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The instance will use LVM devices as backend for its disks. No |
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redundancy is provided. |
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drbd
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``drbd``
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.. note:: This is only valid for multi-node clusters using DRBD 8.0+ |
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A mirror is set between the local node and a remote one, which must be |
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DRBD stacked setup is not fully symmetric and as such it is |
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not working with live migration. |
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rbd
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``rbd``
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The instance will use Volumes inside a RADOS cluster as backend for its |
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disks. It will access them using the RADOS block device (RBD). |
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ext |
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``gluster`` ***** |
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The instance will use a Gluster volume for instance storage. Disk |
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images will be stored in the top-level ``ganeti/`` directory of the |
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volume. This directory will be created automatically for you. |
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``ext`` |
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The instance will use an external storage provider. See |
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:manpage:`ganeti-extstorage-interface(7)` for how to implement one. |
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.. note:: |
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Disk templates marked with an asterisk require Ganeti to access the |
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file system. Ganeti will refuse to do so unless you whitelist the |
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relevant paths in :pyeval:`pathutils.FILE_STORAGE_PATHS_FILE`. |
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The default paths used by Ganeti are: |
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=============== =================================================== |
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Disk template Default path |
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=============== =================================================== |
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``file`` :pyeval:`pathutils.DEFAULT_FILE_STORAGE_DIR` |
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``sharedfile`` :pyeval:`pathutils.DEFAULT_SHARED_FILE_STORAGE_DIR` |
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``gluster`` :pyeval:`pathutils.DEFAULT_GLUSTER_STORAGE_DIR` |
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=============== =================================================== |
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Those paths can be changed at ``gnt-cluster init`` time. See |
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:manpage:`gnt-cluster(8)` for details. |
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IAllocator |
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~~~~~~~~~~ |
Also available in: Unified diff