View source for Storage: LVM Thin

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Storage pool type: lvmthin
LVM normally allocates blocks when you create a volume. LVM thin pools
instead allocates blocks when they are written. This behaviour is
called thin-provisioning, because volumes can be much larger than
physically available space.
You can use the normal LVM command line tools to manage and create LVM
thin pools (see man lvmthin for details). Assuming you already have
a LVM volume group called pve, the following commands create a new
LVM thin pool (size 100G) called data:
lvcreate -L 100G -n data pve
lvconvert --type thin-pool pve/data
Configuration
The LVM thin backend supports the common storage properties content, nodes,
disable, and the following LVM specific properties:
vgname
LVM volume group name. This must point to an existing volume group.
thinpool
The name of the LVM thin pool.
Configuration Example (/etc/pve/storage.cfg)
lvmthin: local-lvm
        thinpool data
        vgname pve
        content rootdir,images
File naming conventions
The backend use basically the same naming conventions as the ZFS pool
backend.
vm-&lt;VMID&gt;-&lt;NAME&gt;      // normal VM images
Storage Features
LVM thin is a block storage, but fully supports snapshots and clones
efficiently. New volumes are automatically initialized with zero.
It must be mentioned that LVM thin pools cannot be shared across
multiple nodes, so you can only use them as local storage.
Table 1. Storage features for backend lvmthin
Content types
Image formats
Shared
Snapshots
Clones
images rootdir
raw
no
yes
yes
Examples
List available LVM thin pools on volume group pve:
# pvesm lvmthinscan pve
See Also
Storage
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