HP XP7 Continuous Access Synchronous User Guide (TK911-96004)

You can switch operations to the remote site either by deleting pairs, then reestablishing them
when recovery is completed; or by not deleting pairs. Both methods are presented below.
Procedure 28 To switch operations to the remote site by deleting pairs
1. Record the pair status and fence level of each S-VOL.
2. Analyze the consistency of the S-VOLs, based on pair status and P-VOL fence level setting.
See “Checking S-VOL consistency with the P-VOL” (page 76).
3. Perform file recovery as needed.
4. Split all pairs from the S-VOLs using one of the following commands:
• RAID Manager pairsplit
• BCM YKSUSPND
• PPRC CSUSPEND
5. Release all pairs using one of the following commands:
• RAID Manager pairsplit -S
• BCM YKRECOVER
• PPRC CRECOVER
If you are not using these tools, connect to each secondary system with Remote Web Console
to split and release the pairs.
NOTE: When the S-VOL is no longer paired, it cannot be distinguished it from a
non-Continuous Access Synchronous volume. Use the appropriate means to change the S-VOL
volume labels.
6. Complete file recovery procedures.
7. Vary the S-VOLs online.
8. At the remote site, start critical host operations, with the previous S-VOLs now the P-VOLs.
Procedure 29 To switch operations to the remote site by not deleting pairs
1. Record the pair status and fence level of each S-VOL.
2. Analyze the consistency of the S-VOLs, based on pair status and P-VOL fence level setting.
See “Checking S-VOL consistency with the P-VOL” (page 76).
3. Perform file recovery as needed.
4. Run the RAID Manager horctakeover or pairsplit-RS on the S-VOL.
5. Complete file recovery procedures.
6. Vary the S-VOLs online.
7. At the remote site, start critical host operations, with the previous S-VOLs now the P-VOLs.
Checking S-VOL consistency with the P-VOL
An S-VOL's consistency refers to whether S-VOL data is identical to data in the P-VOL. This is
dependent on your Fence Level setting, which determines whether data is copied to the P-VOL if
an error occurs during an update to the S-VOL.
76 Disaster recovery