HP XP7 Storage - Manual (Page 91)

Host Attachment and Operations Guide (MK 96RD645) for further information about using ICKDSF
with the XP7.
ICKDSF on a Cnt Ac-S Z P-VOL
ICKDSF activities involve write I/O operations with device support authorization instead of normal
authorization. Because the MCU does not duplicate write I/O operations with device support
authorization at the S-VOL, you must split a pair before running ICKDSF on the P-VOL.
Procedure 29 To perform ICKDSF on a P-VOL:
1. Split the pair from the primary system, using the S-VOL split option. You can also use the
CSUSPEND TSO command.
2. After the P-VOL status changes to suspended/S-VOL by operator, run ICKDSF to repair the
P-VOL.
3. When volume repairs are complete, resynchronize the Cnt Ac-S Z pair. You can also use the
CESTPAIR (MODE=RESYNC) command to resynchronize the pair.
ICKDSF on a Cnt Ac-S Z S-VOL
If you need to run ICKDSF on an S-VOL, you must change the status of the S-VOL to unpaired to
allow write access. The pair must then be restarted using the appropriate initial copy options.
Procedure 30 To perform ICKDSF on an S-VOL:
1. You can stop write I/Os to the P-VOL while the S-VOL is being repaired. To do this, split the
pair from the primary system, specifying Disable for the Primary Volume Write option. You
can also use the CSUSPEND TSO command.
2. In the secondary system’s Remote Replication window, select the S-VOL to be repaired, and
then delete the pair. You can also use the CRECOVER command.
3. If necessary, change the S-VOL VOLSER to avoid problems due to duplicate VOLSERs.
4. Vary the S-VOL online, and run ICKDSF to repair the S-VOL. When the volume repairs are
complete, vary the S-VOL offline.
5. In the primary system’s Remote Replication window, select the P-VOL, and then delete the pair.
6. Recreate the pair with the Create Pairs wizard. Specify Entire Copy for Initial Copy Type. This
will resynchronize the P-VOL and S-VOL. (You can specify No Copy if the P-VOL and S-VOL
are still identical.)
You can also use the CESTPAIR TSO command to recreate the pair.
Managing power-off for systems and network devices
Though you are responsible for controlling power-off activities, it is advisable to check with your
HP representative for assistance.
The following topics provide information for planned outages when Continuous Access Synchronous
Z is present.
General information
Please review the following system behaviors regarding powering off:
•
Cnt Ac-S Z pairs are not affected when power is removed from a primary system while
operations are in progress.
•
When power is restored on the primary system, the system communicates with the secondary
systems to confirm S-VOL pair status(es). Make sure that Cnt Ac-S Z communications are fully
restored (all paths have normal status) before beginning I/O operations to the P-VOL.
If the primary system accepts an I/O for a P-VOL before this, all communications are restored,
and the primary system splits the pair and changes P-VOL status to Suspended-by Remote
Storage System. The primary system cannot change the pair status of the S-VOL.
Managing power-off for systems and network devices 91