9.5.01 HP P4000 SAN Solution User Guide (AX696-96168, February 2012)

the management group is started up, the management group remains in maintenance mode
while the repaired or replaced storage system is resynchronizing with the rest of the
management group.
• After a management group is shut down, a subset of storage systems is powered on. The
management group remains in maintenance mode until the remaining storage systems are
powered on and rediscovered in the CMC.
• For some reason, a storage system comes up, but it is not fully functional.
Manually change management group to normal mode
While the management group is in maintenance mode, volumes and snapshots are unavailable.
You may get volumes and snapshots back online if you manually change the status from maintenance
mode to normal mode, depending upon how your cluster and volumes are configured. However,
manually changing from maintenance mode to normal mode causes the volumes in the management
group to run in degraded mode while it continues resynchronizing, or until all the storage systems
are up, or the reason for the problem is corrected.
CAUTION: If you are not certain that manually setting the management group to normal mode
will bring your data online, or if it is not imperative to gain access to your data, do not change
this setting.
1. In the navigation window, select the management group, and log in.
2. Click Management Group Tasks on the Details tab, and select Edit Management Group.
Figure 51 Manually setting management group to normal mode
3. Click Set To Normal.
Removing a storage system from a management group
When a storage system needs to be repaired or upgraded, remove it from the management group
before beginning the repair or upgrade. Also remove a storage system from a management group
if you are replacing it with another system.
Prerequisites
• Stop the manager on the storage system if it is running a manager. You may want to start a
manager or Virtual Manager on a different storage system to maintain quorum and the best
fault tolerance. See “Stopping managers” (page 116).
• (Optional) If the resultant number of storage systems in the cluster is fewer than the number
required for the data protection level, you may have to change the data protection level of
the volume(s) before removing the storage system from the cluster.
Removing a storage system from a management group 119