Snapshot Volumes

The LVM snapshot feature provides the ability to create virtual images of a device at a particular instant without causing a service interruption. When a change is made to the original device (the origin) after a snapshot is taken, the snapshot feature makes a copy of the changed data area as it was prior to the change so that it can reconstruct the state of the device.

LVM snapshots are not supported across the nodes in a cluster. You cannot create a snapshot
volume in a clustered volume group.

LVM snapshots are not supported for LVM mirrored logical volumes.

Snapshot copies of a file system are virtual copies, not actual media backup for a file system.
Snapshots do not provide a substitute for a backup procedure.

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