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Chapter 4
LUN Configuration
Merge Snapshot
When a Snapshot is merged, the data on the Snapshot replaces the data on the Origin LUN. When the
merge finishes, the merged snapshot is automatically deleted from the system.
A power-loss during a merge operation on any of the SSR/SSN may render permanent data corruption
Caution
on the Origin and on the reminder of the snapshots for the Origin LUN.
Note
During the Snapshot Merge process, GUI performance may be affected until the process completes. The
larger the size and/or the changes on the Origin LUN, the more time the process may take. We
recommend merging larger LUNs during off-peak hours.
To the increase the speed of merging snapshots, we recommend to:
•
•
To merge a Snapshot, do the following:
Note
Before merging a LUN Snapshot with its Origin LUN:
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•
Choose LUN Configuration > LUNs.
Step 1
The LUNs window appears.
Mouse over a LUN snapshot to highlight it and right click.
Step 2
The right-click menu appears.
From the right-click menu, choose Merge Snapshot.
Step 3
The Merge Snapshot confirmation dialog box appears.
Choose Merge to complete the Snapshot merge or choose Cancel to return to the LUNs window.
Step 4
Delete Snapshot
When the maximum number of Snapshots, 10, has been created either manually or automatically via
schedule, the oldest Snapshot, identified by the time created, is deleted when the creation of a new
Snapshot is triggered, either manually or by schedules.
An exception to this process occurs when the oldest Snapshot is mapped to a host or is in use. The
Snapshot will not be automatically deleted and the Snapshot creation will fail. A "Failed Snapshot
Creation" alert is triggered.
Delete other snapshots of the LUN. The fewer the number of snapshots a LUN has, the quicker the
merge.
Merge snapshots before large amounts of data is written to them. Smaller snapshots merge more
quickly.
We recommend that the number of Snapshots for the origin are kept to the minimum needed.
Make sure that both the Origin LUN and the Snapshot are closed.
Cisco UCS Invicta Scaling System Administration and Configuration Guide, Version 5.0.1.1a
4-5
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