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.
- 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 volumes with UR volumes, the pair status must be the following:
- (For UR) PAIR or PSUS.
- (For SI) PAIR or COPY(PD)/COPY.
- If you are sharing SI volumes with TC volumes, the pair status must be the following:
- (For TC) PAIR or PSUS.
- (For SI) PAIR or COPY(PD)/COPY.
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).
- Quick Split or Steady Split the pairs.
For more information about the methods you can use to split pairs, see Pair splitting methods.
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.
For more information about maintaining consistent backups of volumes, see Maintaining consistent ShadowImage secondary volume backups.
- Ensure that all SI pairs in the CTG are in PAIR or COPY(PD)/COPY 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 COPY(PD)/COPY in the CTG, you cannot maintain SI S-VOL consistency.