HP XP Racks - Manual (Page 46)

If you have assigned an BC P-VOL or S-VOL to a volume reserved for Auto LUN, splitting the volume
cancels migration.
If you are splitting BC pairs with shared Cnt Ac-S or Cnt Ac-J volumes, see the restrictions.
If you are sharing BC S-VOLs with Cnt Ac-J P-VOLs and the R-JNL has a timeout period that ends
after the split time, the storage system may not detect the journal data. In this case, the BC split
operation runs after the timeout period.
You set the timeout value according to your requirements.
Default: 6 hours
For more information about the timeout period, see the Business Continuity Manager User Guide.
Related topics
•
“Pair splitting methods” (page 46) .
•
“Prerequisites for splitting BC pairs” (page 46) .
•
“Splitting BC pairs” (page 48) .
•
“Workflow for consistency group pair-split” (page 49) .
•
“BC pair resynchronization” (page 51) .
•
“Sharing volumes with Auto LUN” (page 28) .
•
“Workflow for ensuring data consistency” (page 47) .
•
“Split Pairs wizard” (page 115) .
Pair splitting methods
You can use one of the following methods to split pairs:
•
Steady Split: Copies the differential data to the S-VOL and then splits the pair. The split S-VOL
is identical to the P-VOL at the time of the split.
NOTE: You cannot Steady Split pairs that are assigned to a CG.
•
Quick Split: The pair is split and then the differential data copy so that the S-VOL is immediately
available for read and write I/O. The XP7 storage system copies the remaining differential
data to the S-VOL.
RAID Manager is required.
•
Consistency group pair-split: Simultaneously split all of the pairs in a CG. You can use this
method with RAID Manager.
Related topics
•
“Quick Split and Steady Split performance planning” (page 16) .
•
.
•
“Workflow for consistency group pair-split” (page 49) .
Prerequisites for splitting BC pairs
The following are the prerequisites for splitting BC pairs:
•
The pair status must be one of the following:
(If you are splitting an existing pair) “PAIR” or “COPY(PD)/COPY” ◦
◦ (If you are creating and then immediately splitting an L1 pair) the volumes are unpaired
46 Managing Business Copy pairs