Hitachi Copy-on Write SnapShot, User Manual

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7–2
Monitoring and Maintenance
Hitachi Simple Modular Storage Copy-on-Write SnapShot User’s Guide
Monitoring SnapShot
The SnapShot data pool must have sufficient capacity to handle the
differential data demands placed on it. You must insure that sufficient
capacity is always available for the write workload by closely monitoring the
following:
• Pair status
• Data pool usage
Monitoring Pair Status
To monitor pair status
(Advanced users using CLI, see the Storage Navigator Modular 2 Command
Line Interface (CLI) User’s Guide .)
1. In Navigator 2 GUI, select the desired array, then click the Show &
Configure Array button.
2. From the Replication tree, select the Local Replication icon. The Pairs
screen displays.
3. Locate the pair whose status you want to review in the Pair list, then
review the Status column. Click the Refresh Information button to
make sure the data is current.Statuses and definitions are listed in
Table 7-1 .
•
Table 7-1: Pair Statuses
Pair Status Description Action
Simplex Status when the volume has not
have been paired or when the pair
has been deleted. The volume has
no SnapShot association with
another volume.
Paired V-VOL is a mirror image of the P-
VOL. Updates to the P-VOL are
copied to the V-VOL.
Reverse
Synchronizing P-VOL restoration from V-VOL is in
progress.
Split The snapshot is executed.
Thresholdover Threshold value for the data pool is
exceeded; warning status. Consider increasing data
pool capacity.
Failure Copying is suspended due to a
hardware failure or data pool
overflow. All V-VOLs become
invalid. If data pool overflow is the
cause, increase data pool
capacity.