Storage pool type: lvm
LVM is a thin software layer on top of hard disks and partitions. It can be used to split available disk space into smaller logical volumes. LVM is widely used on Linux and makes managing hard drives easier.
Another use case is to put LVM on top of a big iSCSI LUN. That way you can easily manage space on that iSCSI LUN, which would not be possible otherwise, because the iSCSI specification does not define a management interface for space allocation.
The LVM backend supports the common storage properties content, nodes, disable, and the following LVM specific properties:
LVM volume group name. This must point to an existing volume group.
Base volume. This volume is automatically activated before accessing the storage. This is mostly useful when the LVM volume group resides on a remote iSCSI server.
Zero-out data when removing LVs. When removing a volume, this makes sure that all data gets erased.
Wipe throughput (cstream -t parameter value).
lvm: myspace vgname myspace content rootdir,images
File naming conventions
The backend use basically the same naming conventions as the ZFS pool backend.
vm-<VMID>-<NAME> // normal VM images
LVM is a typical block storage, but this backend does not support snapshot and clones. Unfortunately, normal LVM snapshots are quite inefficient, because they interfere all writes on the whole volume group during snapshot time.
One big advantage is that you can use it on top of a shared storage, for example an iSCSI LUN. The backend itself implement proper cluster wide locking.
|The newer LVM-thin backend allows snapshot and clones, but does not support shared storage.|
|Content types||Image formats||Shared||Snapshots||Clones|
List available volume groups:
# pvesm lvmscan