- For best performance, the maximum number of pairs for the Basic HyperSwap® function is 1,000 per CHA.
- If you perform the Basic HyperSwap function from TPC-R or CSM, the MIH value of host I/O and the host operation is about one second. This value allows MIH to be reported for host I/O or for the host operation.
- Resources in the host system must be adequate. If a shortage occurs, resynchronization of TrueCopy for Mainframe pairs might fail.
- Before you execute the FREEZE command, make sure that the FREEZE operation can be completed within 20 seconds to avoid failure. Configure your system as follows:
- (Number of Host paths) × (Number of LPARs) × (Number of CGROUPs (Number of CUs)) ≤ 160
- Number of pairs ≤ 4,096
- When switching the P-VOL and the S-VOL using the Basic HyperSwap function, use an existing path to resynchronize the
TCz pair.
If no paths are created, you cannot switch the volumes using the Basic HyperSwap function.
- Use the same model and the same microcode version for storage systems at the primary and secondary sites. Otherwise, supported functions differ between the primary storage system and the secondary storage systems.
After switching the P-VOL and the S-VOL using Basic HyperSwap function, if a command for an unsupported function is issued, the command might terminate abnormally.