HP XP7 Storage - Manual (Page 94)

4. Use the IBM P/DAS host software function to redirect all application I/Os to the S-VOLs non
disruptively. If the host system does not support P/DAS, use the following procedure to stop
using the P-VOLs and switch to the S-VOLs:
1.
Quiesce all applications using the P-VOLs.
2. When all update activity to the P-VOLs has stopped, connect to the MCU, select the correct
CU, and release the Cnt Ac-S Z pairs.
3. If the P-VOLs and S-VOLs are attached to the same host, vary the P-VOLs offline first, and
then vary the S-VOLs online. The P-VOLs and S-VOLs have the same VOLSERs and cannot
be online to the same hosts at the same time.
4. If an S-VOL contains more cylinders than its P-VOL, update the S-VOL volume table of
contents (VTOC) using ICKDSF/REFORMAT.
5. If you want to keep the volumes synchronized, establish the same Cnt Ac-S Z pairs in the
reverse direction using the No Copy initial copy option. If the original P-VOLs will be
temporarily unavailable for update copy operations, you can suspend the new pairs so
that the new MCU keeps track of changes.
6. Start the applications with the S-VOLs. When the original P-VOLs become available, you
can resynchronize the pairs.
If the original P-VOL is temporarily unavailable for update copy operations, split the new pair so
that the new primary system keeps track of changes.
CFW data is not migrated when you specify Primary Volume Only for the CFW Data option. Note
that there is a possibility that I/O will terminate abnormally if you access the corresponding data
set when you use the S-VOL after migrating data.
94 Data migration