HP Surestore E Disk Array XP256 HP XP P9000 External Storage Access Manager Us - Page 39

Releasing a pair, Delete Pair by Force

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Releasing a pair You can release a pair when you no longer need to keep the P-VOL and S-VOL synchronized. You can release a single pair or multiple pairs using the same procedure. When you release a pair from the P-VOL, the primary storage system stops copy operations and changes pair status of both P-VOL and S-VOL to SMPL. The system continues to accept write I/O to the P-VOL volume, but does not keep track of the updates as differential data. When you release a pair from the S-VOL, the secondary storage system changes S-VOL status to SMPL, but does not change P-VOL status. When the primary storage system performs the next pair operation, it detects that S-VOL status as SMPL and changes P-VOL status to PSUS. The suspend type is Delete pair to RCU. TIP: Best Practice: Release a pair from the P-VOL. If the pair has a failure and cannot be released from the P-VOL, then release it from the S-VOL. 1. Verify that the P-VOL has the latest data using one of the following methods: • On the secondary storage system, open the Pair Operation window. Check that the Volume Access column for the S-VOL is blank (must not show Access Lock). • Use the multipath software command to check if the P-VOL path (owner path) is online. 2. Vary the S-VOL path offline using the multipath software command. 3. Access the MCU in RWC, then click Actions > Remote Copy > Continuous Access Synchronous > Pair Operation. 4. Make sure that you are in the modify mode. 5. In the Pair Operation window tree, select the CU group, CU, port, or host group where the P-VOL is located. 6. Right-click the pair to be released and click Pairsplit-S. 7. In the Pairsplit-S dialog box, Delete Pair by Force drop-down menu, select one of the following: • Yes: The pair will be released even if the primary storage system cannot communicate with the secondary storage system. This option can be used to free a host waiting for a response from the primary storage system, thus allowing host operations to continue. • No: The pair will be released only if the primary storage system can change pair status for both P-VOL and S-VOL to SMPL. When the status of the pair to be released is SMPL, the default setting is Yes and it cannot be changed. If the status is other than SMPL, the default setting is No. 8. Click Set. 9. Click Apply. Releasing a pair 39

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Releasing a pair
You can release a pair when you no longer need to keep the P-VOL and S-VOL synchronized. You
can release a single pair or multiple pairs using the same procedure.
When you release a pair from the P-VOL, the primary storage system stops copy operations and
changes pair status of both P-VOL and S-VOL to SMPL. The system continues to accept write I/O
to the P-VOL volume, but does not keep track of the updates as differential data.
When you release a pair from the S-VOL, the secondary storage system changes S-VOL status to
SMPL, but does not change P-VOL status. When the primary storage system performs the next pair
operation, it detects that S-VOL status as SMPL and changes P-VOL status to PSUS. The suspend
type is
Delete pair to RCU
.
TIP:
Best Practice: Release a pair from the P-VOL. If the pair has a failure and cannot be released
from the P-VOL, then release it from the S-VOL.
1.
Verify that the P-VOL has the latest data using one of the following methods:
•
On the secondary storage system, open the
Pair Operation
window. Check that the
Volume Access
column for the S-VOL is blank (must not show
Access Lock
).
•
Use the multipath software command to check if the P-VOL path (owner path) is online.
2.
Vary the S-VOL path offline using the multipath software command.
3.
Access the MCU in RWC, then click
Actions > Remote Copy > Continuous Access Synchronous
> Pair Operation
.
4.
Make sure that you are in the modify mode.
5.
In the
Pair Operation
window tree, select the CU group, CU, port, or host group where the
P-VOL is located.
6.
Right-click the pair to be released and click
Pairsplit-S
.
7.
In the
Pairsplit-S
dialog box,
Delete Pair by Force
drop-down menu, select one of the following:
•
Yes
: The pair will be released even if the primary storage system cannot communicate
with the secondary storage system. This option can be used to free a host waiting for a
response from the primary storage system, thus allowing host operations to continue.
•
No
: The pair will be released only if the primary storage system can change pair status
for both P-VOL and S-VOL to SMPL.
When the status of the pair to be released is SMPL, the default setting is Yes and it cannot be
changed. If the status is other than SMPL, the default setting is No.
8.
Click
Set
.
9.
Click
Apply
.
Releasing a pair
39