HP XP Racks User Manual
Page 60
1.
Verify that the S-VOL has the latest data and is being updated. Open the Pair Operation
window on the secondary storage system and check that the VOL Access column shows Access
(Lock).
2.
Stop I/O from the host.
3.
On the secondary storage system, release the ESAM pair.
4.
On the secondary storage system, delete the quorum disk ID.
5.
On the secondary storage system, create a Continuous Access Synchronous pair. The data
flow is from secondary to primary sites.
6.
Format the quorum disk.
7.
On the primary storage system, register the ESAM secondary storage system to the primary
storage system.
8.
Continue by changing the Continuous Access Synchronous pair to a ESAM pair (below) or
recreating the ESAM pair (next steps).
If changing the Continuous Access Synchronous pair to a ESAM pair, complete this step.
1.
When the Continuous Access Synchronous operation finishes, run the horctakeover
command on the primary storage system S-VOL to reverse the P-VOL and S-VOL.
2.
On the primary and secondary storage systems, add the quorum disk.
3.
Using RWC, on the primary system, split the Continuous Access Synchronous pair.
4.
Using RWC, on the primary system, change the Continuous Access Synchronous pair to
a ESAM pair. See
“Changing Continuous Access Synchronous pairs to ESAM pairs ”
for details.
9.
If recreating the ESAM pair using RAID Manager:
1.
When the copy operation in Step 5 completes, release the Continuous Access Synchronous
pair.
2.
On the primary and secondary storage systems, add the quorum disk.
3.
On the primary storage system, run the paircreate command to create the ESAM pair.
10. If recreating the ESAM pair using RWC:
1.
On the secondary storage system, release the Continuous Access Synchronous pair.
2.
On the primary and secondary storage systems, add the quorum disk.
3.
On the primary storage system, create the ESAM pair.
11. On both the primary and secondary storage systems, in RWC make sure that Type shows
ESAM.
12. Using the multipath software, vary the owner and non-owner paths online.
13. Restart host I/O.
Recovering the system when host I/O updates have stopped
Recovering the primary storage system from power failure, when host I/O updates have stopped,
involves the completion of tasks on both the primary storage system and secondary storage system.
You use multipath software and either RWC or RAID Manager to complete the recovery procedure.
TIP:
Some of the steps can be performed using either RWC or RAID Manager. Typically, you
can complete these steps quicker using RAID Manager.
1.
Verify that the P-VOL has the latest data by opening the Pair Operation window on the
secondary storage system (S-VOL side) and checking that the VOL Access column is empty
(blank).
2.
On the secondary storage system, release the ESAM pairs.
3.
On the secondary storage system, delete the quorum disk ID.
4.
Format the quorum disk.
60
Disaster recovery