You can create, update, and copy TC pairs in a consistency group of multiple primary storage systems and multiple secondary storage systems. Data consistency between secondary volumes in a consistency group of multiple primary and secondary storage systems is guaranteed for open systems. This means that TC secondary volumes in multiple storage systems at secondary sites are guaranteed for data consistency if the update sequence of data in a higher system (between servers) is guaranteed (data update sequence is necessary).
Figure notes:
- CCI uses a consistency group that consists of multiple primary and secondary storage 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.