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318 Administering 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