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78 lines
1.9 KiB
Plaintext
78 lines
1.9 KiB
Plaintext
LVM thin Backend
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----------------
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Storage pool type: `lvmthin`
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LVM normally allocates blocks when you create a volume. LVM thin pools
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instead allocates blocks when they are written. This behaviour is
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called thin-provisioning, because volumes can be much larger than
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physically available space.
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You can use the normal LVM command line tools to manage and create LVM
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thin pools (see 'man lvmthin' for details). Assuming you already have
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a LVM volume group called `pve`, the following commands create a new
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LVM thin pool (size 100G) called `data`:
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----
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lvcreate -L 100G -n data pve
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lvconvert --type thin-pool pve/data
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----
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Configuration
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~~~~~~~~~~~~~
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The LVM thin backend supports the common storage properties `content`, `nodes`,
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`disable`, and the following LVM specific properties:
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`vgname`::
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LVM volume group name. This must point to an existing volume group.
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`thinpool`::
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The name of the LVM thin pool.
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.Configuration Example ('/etc/pve/storage.cfg')
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----
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lvmthin: local-lvm
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thinpool data
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vgname pve
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content rootdir,images
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----
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File naming conventions
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~~~~~~~~~~~~~~~~~~~~~~~
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The backend use basically the same naming conventions as the ZFS pool
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backend.
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vm-<VMID>-<NAME> // normal VM images
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Storage Features
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~~~~~~~~~~~~~~~~
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LVM thin is a block storage, but fully supports snapshots and clones
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efficiently. New volumes are automatically initialized with zero.
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It must be mentioned that LVM thin pools cannot be shared across
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multiple nodes, so you can only use them as local storage.
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.Storage features for backend `lvmthin`
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[width="100%",cols="m,m,3*d",options="header"]
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|==============================================================================
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|Content types |Image formats |Shared |Snapshots |Clones
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|images rootdir |raw |no |yes |yes
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|==============================================================================
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Examples
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~~~~~~~~
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List available LVM thin pools on volume group `pve`:
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# pvesm lvmthinscan pve
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