You can create, update, and copy TC pairs or both TC pairs and TCz pairs in a consistency group of multiple primary storage systems and multiple secondary storage systems.
(VSP Gx00 models, VSP Fx00 models, and VSP E series) 
- CCI uses a consistency group that consists of multiple primary and secondary storage systems. Business Continuity Manager cannot be used with multiple systems.
- I/O requests are received from each application in the open-system server to update data in each volume.
- The
TC copy operation is performed in the consistency group.
When a pair is created, the pair is assigned to a consistency group. For information on creating consistency groups of multiple primary and secondary storage systems and assigning TC pairs to a consistency group, see the Command Control Interface Installation and Configuration Guide and the Command Control Interface Command Reference.
(VSP 5000 series) TC and TCz pairs in multiple primary and secondary systems can be placed in the same consistency group. A maximum of four storage system pairings can be placed in the same consistency group.
In a consistency group for multiple primary and secondary storage systems, you cannot use Business Continuity Manager to perform operations, including registrations, for TrueCopy for Mainframe pairs.
- CCI manages the consistency group that contains multiple storage systems.
- Open and mainframe primary volumes (P-VOLs) receive I/O requests from their applications at the primary (main) site, and data in the volumes is updated.
- TrueCopy or TrueCopy for Mainframe runs the copy operation in the consistency group.
When the open or mainframe host system guarantees the update order, data consistency in P-VOLs and S-VOLs is ensured. When the host system does not guarantee update order, data consistency is not ensured.