HP Surestore E Disk Array XP256 HP XP P9000 External Storage Access Manager Us - Page 60

Recovering the system when the RCU is receiving host I/O updates

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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. 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. If using RAID Manager to change the Continuous Access Synchronous pair to an ESAM pair, complete this step. If using RWC, go directly to the RWC 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. Run the pairsplit-r command on the primary storage system P-VOL to split the Continuous Access Synchronous pair. 4. Run the pairresync command on the P-VOL using RWC to change the Continuous Access Synchronous pair to an ESAM pair. 9. If using RAID Manager to create the ESAM pair, complete the following steps: 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 using RWC, complete the following steps: 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, 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. 60 Disaster recovery

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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.
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.
If using RAID Manager to change the Continuous Access Synchronous pair to an ESAM pair,
complete this step. If using RWC, go directly to the RWC 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.
Run the
pairsplit-r
command on the primary storage system P-VOL to split the
Continuous Access Synchronous pair.
4.
Run the
pairresync
command on the P-VOL using RWC to change the Continuous
Access Synchronous pair to an ESAM pair.
9.
If using RAID Manager to create the ESAM pair, complete the following steps:
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 using RWC, complete the following steps:
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, 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.
60
Disaster recovery