HP XP P9500 Storage - Manual (Page 32)

It is best practice to release a pair from the P-VOL. If the pair has a failure and cannot be released
from the P-VOL, you can release it from the S-VOL.
•
Releasing a pair from the P-VOL:
The primary 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.
•
Releasing a pair from the S-VOL:
The secondary system changes S-VOL status to SMPL, but does not change P-VOL status. When
the primary 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".
The following steps can be performed for one or multiple pairs.
Procedure 13 To release a pair from the P-VOL:
1. Verify that the P-VOL has the latest data using one of the following methods:
•
On the secondary system, open the Pair Operation window. Check that the Volume Access
column for the S-VOL is blank (must not display 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 Remote Web Console, 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 system cannot communicate with the
secondary system. This option can be used to free a host waiting for a response from the
primary system, thus allowing host operations to continue.
•
No: The pair will be released only if the primary 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.
10. Verify that the operation completes successfully (changes to SMPL status).
If you want to use the S-VOL for other purposes, perform one of the following operations so that
the host can recognize that it as a normal volume.
•
Execute the device recognition command provided by the operating system on the host.
•
Reboot the host.
Changing Continuous Access Synchronous pairs to ESAM pairs
You can convert a Continuous Access Synchronous pair to an ESAM pair.
Prerequisite information:
•
ESAM system requirements must be met.
•
The microcode version of the primary and secondary systems must be DKCMAIN 70-01-4x
or later.
32 Pair operations