HP XP P9000 Business Copy User Guide (AV400-96573, July 2013)

The following takes place when you run consistency group pair-split with shared Cnt Ac-J volumes:
1. Cnt Ac-J restore journal data created before the split time is restored to Cnt Ac-J S-VOLs (BC
P-VOLs).
2. Restore journal operations are suspended when Cnt Ac-J detects restore journal data with a
time stamp later than the split time. After the Cnt Ac-J suspension, the BC split operations run.
3. When BC split operations are completed, Cnt Ac-J resumes the suspended restore journal
operations.
Requirements, restrictions, and recommendations for shared volumes
The following is a list of the requirements, restrictions, and recommendations for using the consistency
group pair-split with shared Cnt Ac-S or Cnt Ac-J volumes:
• RAID Manager is required.
• You must share the BC P-VOLs with the Cnt Ac-J or Cnt Ac-S S-VOLs.
• The BC pairs must be registered in the same BC consistency group to ensure consistent backup
operations.
• If you are sharing BC P-VOLs in a storage system with Cnt Ac-J or Cnt Ac-S S-VOLs, to prevent
the consistency group pair-split from ending abnormally, ensure the status of all Cnt Ac-J or
Cnt Ac-S pairs in the consistency group is the same, PAIR or PSUS.
• You can perform one split operation per BC consistency group.
• Cnt Ac-J pairs must belong to the same journal group. If multiple journal groups are registered
in one BC consistency group, consistent backup cannot be ensured on BC S-VOLs.
• With Cnt Ac-J, three split operations can be performed per Cnt Ac-J journal (equivalent to
three BC consistency groups).
Consistency group pair-split and supported pair statuses
The pair status for all of the BC pairs in the consistency group determines if you can perform
consistency group pair-split. If all of the BC pairs in the consistency group are paired (PAIR status),
you can perform consistency group pair-split.
20 Requirements and planning