You can share SI P-VOLs with TC or UR S-VOLs but there are requirements, restrictions, and guidelines for using consistency group (CTG) pair-split in these cases.
Requirements
If you are sharing SI P-VOLs with TC or UR S-VOLs, CTG pair-split has the following requirements:
- All pair operations must be performed using CCI.
- (VSP One Block 85) To perform a CTG pair-split on ShadowImage pairs, pair operations must be done using CCI.
- You must share SI P-VOLs with the TC or UR S-VOLs.
- The TC or UR S-VOLs that you are sharing with the SI CTG pairs must have the same status.
- If you are sharing SI P-VOLs with UR volumes or TC volumes, the pair status must be as shown in the following table.
Volume shared with SI P-VOLs
Pair status of the shared volumes
Can CTG pair-split be performed?
UR S-VOLs
COPY
No
PAIR
Yes
PSUS
Yes
PSUE (VSP One B85 only)
Yes
TC S-VOLs
COPY
No
PAIR
Yes
PSUS
Yes
PSUE (VSP One B85 only)
Yes
Restrictions
If you are sharing SI P-VOLs with TC or UR S-VOLs, CTG pair-split has the following restrictions:
- You can perform one split operation for each SI CTG.
- You can split each UR journal up to three times (equivalent to three SI CTGs).
Guidelines
If you are sharing SI P-VOLs with TC or UR S-VOLs, use the following guidelines when performing a CTG pair-split:
- Make sure that the SI S-VOLs are in a consistent state.
- Ensure that all SI pairs in the CTG are in PAIR/DUPLEX or CPPD/PENDING status.Note: If you share SI pair P-VOLs with UR S-VOLs and you include SI pairs in a status other than PAIR or CPPD in the CTG, you cannot maintain SI S-VOL consistency.