- A pair can be assigned to one consistency group only.
- (VSP 5000 series) A maximum of 256 (00 to FF) consistency groups can be created. A maximum of 8,192 pairs can be registered to a consistency group.
- (Virtual Storage Platform G/F350, G/F370, G/F700, G/F900, VSP E series) For the maximum number of consistency groups and the maximum number of TC pairs that you can create, see System requirements and specifications and Maximum number of pairs supported.
- (VSP 5000 series)
TC pairs and
TCz pairs can be contained in a consistency group.
Note: If a primary and secondary storage systems are not the same model, the maximum number of pairs in a consistency group and the maximum number of consistency groups is the smaller number of the two.
- Assign a consistency group ID in a range from 00-FF. The ID must be unused.
- When using a volume in a virtual storage machine, if you want to create a consistency group of one primary and one secondary storage system, use volumes in the same virtual storage machine to create a pair. If you register a pair created using different virtual storage machine volumes to a consistency group, the consistency group is regarded as a consistency group of multiple primary and secondary storage systems.
- When assigning pair volumes that belong to a virtual storage machine to a consistency group consisting of one primary and one secondary system, all the P-VOLs in the consistency group must belong to the same virtual storage machine.
- If you use Command Control Interface to resynchronize a TCz pair in an open/mainframe consistency group with one primary system and secondary system, all pairs in the consistency group are resynchronized. A TC pair is also resynchronized with the others, even if its TC S-VOL is being accessed by a host. Make sure to check the status of all pairs in the consistency group before resynchronizing.
- If you use Command Control Interface to delete a TCz pair in an open/mainframe consistency group with one primary system and secondary system, only the TCz pairs are deleted. Use CCI to delete the TC pairs.
- (VSP 5000 series)To set or use TrueCopy Synchronous pairs with TC open/MF consistency groups specified, you must install TrueCopy Synchronous. In addition, TrueCopy consistency groups and open/MF consistency groups described in the Hitachi TrueCopy® for Mainframe User Guide are the same. For details about TrueCopy consistency groups, see Consistency group planning.