HP XP Racks - Manual (Page 59)

6. On the primary storage system, delete the quorum disk ID.
If the quorum disk ID cannot be deleted due to a disk failure, forcibly delete the quorum disk.
7. On the secondary storage system, delete the quorum disk ID.
8. On both systems, run the Disconnect External Volumes command on the quorum disk.
If the connection to the quorum disk cannot be released due to the failure of the quorum disk,
skip the Disconnect External Volumes operation.
9. Replace the quorum disk.
10. On both systems, run the Reconnect External Volumes command on the quorum disk.
11. On both systems, add the quorum disk ID.
12. Perform one of the following operations:
•
If changing the Continuous Access Synchronous pair to a ESAM pair: use RWC to split
the the Continuous Access Synchronous pair, then change the pair to a ESAM pair. See
“Changing Continuous Access Synchronous pairs to ESAM pairs ” (page 39) .
•
If using RAID Manager and are recreating the ESAM pair: On the primary storage system,
run the paircreate command to create the ESAM pair.
•
If using RWC and are recreating the ESAM pair again: On the primary storage system,
use the paircreate(ESAM) dialog box to create a ESAM pair.
13. On both the primary and secondary storage systems, in RWC make sure that Type shows
ESAM.
14. Use the multipath software to vary the owner path online.
15. Restart I/O.
Recovery from power failure
You can recover the primary storage system or secondary storage system from power failures that
cause the system’s backup batteries to discharge and cause the loss of differential data.
The recovery process varies depending on the type of system.
•
“primary storage system recovery” (page 59)
•
“Secondary system recovery” (page 61)
primary storage system recovery
There are two procedures you can use to recover the system following a power failure that results
in the initialization of the system memory. Which task you use depends on whether or not host I/O
updates have stopped. You must use the correct procedure to ensure the recovery is successful.
The tasks are:
•
“Recovering the system when the RCU is receiving host I/O updates” (page 59) .
•
“Recovering the system when host I/O updates have stopped” (page 60) .
Recovering the system when the RCU is receiving host I/O updates
Recovering the primary storage system from power failure, when host I/O updates continue after
failover, involves the completion of tasks on both the primary storage system and secondary storage
system. Because failover occurred, you must complete the steps required to restore the original
relationship of the volumes.
You use multipath software and either RWC or RAID Manager to complete the recovery procedure.
TIP: Some of the steps can be done using either RWC or RAID Manager. Typically, you can
complete these steps quicker using RAID Manager.
Recovery from power failure 59