Revision 32f88ce7 doc/design-storagetypes.rst
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The noded RPC call that reports node storage space will be changed to |
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accept a list of <disktemplate>,<key> string tuples. For each of them, it will
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accept a list of <storage_type>,<key> string tuples. For each of them, it will
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report the free amount of storage space found on storage <key> as known |
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by the requested disk template. Depending on the disk template, the key would
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be a volume group name, in case of lvm-based disk templates, a directory name
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for the file and shared file storage, and a rados pool name for rados storage.
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by the requested storage_type. Depending on the storage_type, the key would
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be a volume group name in case of lvm, a directory name for the file-based
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storage, and a rados pool name for rados storage. |
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Masterd will know through the mapping of disk templates to storage types which
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storage type uses which mechanism for storage calculation and invoke only the
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needed ones. |
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Masterd will know through the mapping of storage types to storage calculation
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functions which storage type uses which mechanism for storage calculation
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and invoke only the needed ones.
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Note that for file and sharedfile the node knows which directories are allowed |
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and won't allow any other directory to be queried for security reasons. The |
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``exclusive_storage`` flag, which is currently only meaningful for the |
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LVM storage type. Additional flags like the ``exclusive_storage`` flag |
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for lvm might be useful for other disk templates / storage types as well. |
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We therefore extend the RPC call with <disktemplate>,<key> to
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<disktemplate>,<key>,<params> to include any disk-template-specific
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We therefore extend the RPC call with <storage_type>,<key> to
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<storage_type>,<key>,[<param>] to include any disk-template-specific
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(or storage-type specific) parameters in the RPC call. |
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The reporting of free spindles, also part of Partitioned Ganeti, is not |
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