IBM® System Storage® DS5000 and IBM DS4000® series disk controllers provide functions that can be used with the SAN Volume Controller.
Diagnostics are automatically recovered by the SAN Volume Controller software. After the controller run diagnostics option is used, check your managed disks (MDisks) to ensure that they have not been set to degraded mode.
The controller disable data transfer option is not supported when a SAN Volume Controller is attached to IBM System Storage DS5000 or IBM DS4000 systems.
Do not set an array offline because you can lose access to the MDisk group.
The array increase capacity option is supported but the new capacity is not usable until the MDisk is removed from the MDisk group and re-added to the MDisk group. You might have to migrate data to increase the capacity.
You can redistribute logical drives or change ownership of the preferred path; however, these options might not take effect until a discovery is started on the SAN Volume Controller cluster. You can use the svctask detectmdisk command-line interface (CLI) command to restart a cluster discovery process. The discovery process rescans the fibre-channel network to discover any new MDisks that might have been added to the cluster and to rebalance MDisk access across the available controller device ports.
You must only use the controller reset option if you are directed to do so by IBM Service and the alternate controller is functional and available to the SAN. The SAN Volume Controller reset is automatically recovered by the SAN Volume Controller software.
Check your MDisks to ensure that they have not been set to the degraded state during the controller reset process. You can issue the svctask includemdisk CLI command to repair degraded MDisks.