Snapshot Volumes - Red Hat LVM ADMINISTRATOR FOR RHEL 4.5 Administrator's Manual

Chapter 2. LVM Components
mirror or mirrors. This log can be kept on disk, which will keep it persistent across reboots, or it
can be maintained in memory.
Figure 2.6, "Mirrored Logical Volume"
configuration, the log is maintained on disk.
Figure 2.6. Mirrored Logical Volume
For information on creating and modifying mirrors, see
Volumes".

3.4. 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.
Note
LVM snapshots are not supported across the nodes in a cluster.
14
shows a mirrored logical volume with one mirror. In this
Section 4.1.3, "Creating Mirrored