HP LeftHand P4000 SAN Solutions - Manual (Page 137)

3. In the Reorder Storage Systems window, select a storage system and click the up or down
arrow to move it to the desired position.
4. Click OK when the storage systems are in the desired order.
Exchange a storage system in a cluster
Use the Exchange storage system feature when you are ready to return a repaired storage system
to the cluster. Exchanging a storage system is preferred to adding the repaired storage system to
the cluster. Exchanging the storage system requires only a resynchronization of the data on the
exchanged storage system, rather than a restripe of data in the cluster, which minimizes the time
required to bring the cluster back to full operation. See
“Repairing a storage system” (page 138) .
1. Select the cluster in the navigation window.
2. Click Cluster Tasks, and select Edit Cluster
→Exchange Storage Systems.
3. In the Exchange Cluster Storage Systems window, select the storage system to remove and
click Exchange Storage Systems.
4. Select the storage system to exchange in the Exchange Storage System window and click OK.
5. Click OK to complete the exchange.
Removing a storage system from a cluster
You can remove a storage system from a cluster only if the cluster contains sufficient storage systems
to maintain the existing volumes and their data protection level. See
“Editing a volume” (page 158)
for more information about editing volumes.
1. In the Edit Cluster window, select a storage system from the list.
2. Click Remove Systems.
The storage system moves out of the cluster, but remains in the management group.
3. Click OK when you are finished.
NOTE: Removing a storage system causes a full cluster restripe.
Troubleshooting a cluster
Auto Performance Protection monitors individual storage system health related to performance
issues that affect the volumes in the cluster.
Repairing a storage system provides a way to replace a failed disk in a storage system and
minimize the time required to bring the storage system back to normal operation in the cluster with
fully synchronized data.
Auto Performance Protection
If you notice performance issues in a cluster, a particular storage system may be experiencing slow
I/O performance, overload, or latency issues. Identify whether Auto Performance Protection is
operating by checking the storage system status on the storage system Details tab.
Auto Performance Protection is indicated by two unique statuses reported on the Details tab. You
will also receive event notifications on these statuses. For information about setting up event
notification, see
“Configuring events” (page 88) .
•
Storage System Overloaded—Indicates that operations to the storage system are completing
too slowly. In this state, volume availability is maintained while the storage system is
Troubleshooting a cluster 137