Overland Storage Snapshot SnapSAN User Manual page 42

SnapSAN S3000/S5000 Snapshot User Guide
When a restore fault occurred, it is necessary to reexecute the restoration from the SV that
is in the restore suspended state.
To restore a snapshot, the following conditions need to be satisfied.
• The relationship between the BV and SV to be operated is established.
• The activity state of the BV and SV to be operated is in the snapshot active state.
• The activity state of other SVs set to the BV to be operated is not being deleted,
restored, or prepared for restoration.
• In the derived SV auto delete mode, there is not SV to which guard is set in the later
generations than the generation of the SV to be operated.
• The BV to be operated is unlinked.
• A link is not set between the SV to be operated and LV.
• BV is unmounted from a host.
• No link is set to other SVs, which are set to the BV to be operated, with any LV.
• If pair setting is made to the BV to be operated as replication MV, the replication state
is not being restored or replicated.
• If pair setting is made to the BV to be operated as replication RV, the replication state
is in the Separate state.
• BV to be operated is not in the update prevention state.
• The disk array is not in the freeze state.
Deleting a Snapshot
This function deletes a snapshot image created in SV. Deleting unwanted snapshots enables
you to use storage capacity effectively.
If BV retains multiple generations, you can delete any generation. However, note that free
space may not be increased if you delete a middle generation. (The area is not released if the
snapshot data needs to be retained as the differential information of the older snapshot than
the deleted generation).
It may take some time to delete a snapshot depending on the amount of differentials. If you
suspend operation to delete a snapshot, pay attention to that.
A snapshot can be deleted by command operation from a server on which SnapControl is
installed or by GUI operation with iSM.
To delete a snapshot, the following conditions need to be satisfied.
10400422-002 02/2013
Figure 3-12: Deleting a Snapshot
©2013 Overland Storage, Inc.
 3-13