HP XP Racks - Manual (Page 28)

5. Create RAID Manager configuration definition file C for the multiple primary and secondary
system configuration.
6. Perform the pairresync operation and register them to configuration definition file C.
Using an existing CG
You can assign new pairs or existing pairs to an existing consistency group.
Procedure 4 To assign new pairs to an existing consistency group
1. Add pair information to the existing configuration definition file B, which consists of pairs in
multiple XP7s.
2. Copy and create RAID Manager configuration definition file C.
3. Perform the paircreate operation and register them to configuration definition file C.
Procedure 5 To assign existing pairs to an existing consistency group
1. Create RAID Manager configuration definition file A with which to use RAID Manager for pair
operations.
2. Perform the pairsplit operation on pairs that you want to register in the existing CG with
multiple systems. Do this using configuration definition file A.
3. Perform the pairresync operation without designating a consistency group. Do this using
configuration definition file A.
4. Perform the pairsplit operation again using configuration definition file A.
5. Perform the pairsplit operation to the existing configuration definition file B, which consists of
the pairs in the multiple primary and secondary system configuration.
6. Add pair information to existing configuration definition file B.
7. Delete then re-create the pairs, registering them in configuration definition file C.
Split behaviors for pairs in a CG
When the pairs in a consistency group receive updates while in the process of being split or
suspended, or when they are about to be split or suspended, S-VOL data consistency is managed
as follows:
•
If I/O processing is in progress on pairs in the same consistency group, and the split or suspend
operation begins, the I/O processing completes first, then the split/suspend operation is run.
The following figure shows that I/O processing completes first; then the pair split operation
for the pair on Volume B completes.
The following figure shows data in track 2 being copied to the S-VOL, and the data in track 3
becomes differential data. In this case, track 2 is used for I/O processing to the volume in the
consistency group when the split command is issued to the pair.
28 Planning for Continuous Access Synchronous