To release Compatible FlashCopy® V2 relationships, use any of the following types of commands:
- PPRC TSO
- DFSMSdss
- ANTRQST macro
- z/VM CP
Avoiding timeouts when releasing relationships
- A withdraw command deletes relationships in the volume all at once, so a timeout might occur if you execute a withdraw command when the number of relationships per volume is large and the MP operating rate of the MP unit is high. To avoid these timeouts, ensure the maximum number of relationships per volume does not exceed 4000.
- If an MIH occurs and cancellation of a relationship ends abnormally, the relationship remains in effect. If this occurs, re-execute the withdraw command.
- When you cancel a large number of relationships, the cancel relationships process might cause an MIH to occur. To prevent this, complete background copy operations before you cancel relationships.
- To prevent an MIH from occurring, reduce the number of relationships to be canceled with one command to 4000 or less. This also applies when you execute the INIT, SCRATCH, or DELETE commands, which cause the withdraw command to be issued during processing.