Veritas Volume Manager 5.0 Administrator's Guide (September 2006)

309Administering volume snapshots
Restoring the original volume from a snapshot
Figure 9-9 Resynchronizing an original volume from a snapshot
Note: The original volume must not be in use during a snapback operation that specifies
the option
-o resyncfromreplica to resynchronize the volume from a snapshot. Stop
any application, such as a database, and unmount any file systems that are configured to
use the volume.
For instant snapshots, the vxsnap restore command may be used to restore the
contents of the original volume from an instant snapshot or from a volume derived from an
instant snapshot. The volume that is used to restore the original volume can either be a true
backup of the contents of the original volume at some point in time, or it may have been
modified in some way (for example, by applying a database log replay or by running a file
system checking utility such as
fsck) to create a synthetic replica. All synchronization of
the contents of this backup or synthetic replica volume must have been completed before
the original volume can be restored from it. The original volume is immediately available
for use while its contents are being restored.
Note: You can perform either a destructive or non-destructive restoration of an original
volume from an instant snapshot. Only non-destructive restoration is possible from a
space-optimized snapshot. In this case, the snapshot remains in existence after the
restoration is complete.
Original
volume
snapshot
Snapshot
volume
Snapshot
mirror
-o resyncfromreplica snapback
Refresh on
snapback