HP LeftHand P4000 SAN Solutions - Manual (Page 138)

quarantined in the cluster. While the storage system is quarantined it does not participate in
I/O, which should relieve the performance degradation.
After the operations return to normal (in 10 minutes), the storage system is returned to active
status and resynchronized with the data that has changed since its quarantine. Volumes that
depend on this storage system will then show “Resyncing” on the volume Details tab.
•
Storage System Inoperable—Indicates that the storage system is unable to repair the slow
I/Os, which may indicate a potential hardware problem. Volumes that depend on this storage
system are unavailable. For information about how to determine volume availability, see the
section
“Determining volume and snapshot availability” (page 18) .
Rebooting the storage system may return the status to Normal.
Auto Performance Protection and the StoreVirtual VSA
The StoreVirtual VSA will not report Storage System Overloaded, because there is no way to
determine what may be affecting I/O on the underlying hardware. However, the StoreVirtual VSA
can accurately report when I/Os are not completing, and can return the Inoperable status.
Auto Performance Protection and other clusters
Auto Performance Protection operating on a storage system in one cluster will not affect performance
of other clusters in the management group.
To identify whether Auto Performance Protection is active on a storage system in a cluster with
performance issues:
1. Select the affected storage system in the navigation window.
The storage system displays the Critical icon in the tree.
2. View the Status line on the Details tab.
•
If the status is Storage System Overloaded, wait up to 10 minutes and view the status
again. The status may return to Normal and the storage system will be resyncing.
•
If the status is Storage System Inoperable, reboot the storage system and see if it returns
to Normal when it comes back up.
•
If either status reoccurs, it may be an indication that the underlying hardware problem
still exists.
Figure 66 Viewing the storage system status on the Details tab
1. Status line
Repairing a storage system
Repairing a storage system allows you to perform maintenance on or repair a storage system that
contains volumes configured for data protection levels other than Network RAID-0. Repairing a
storage system has the advantage of triggering only one resynchronization of the data on the
138 Working with clusters