Data consistency between secondary volumes in a consistency group of multiple primary and secondary storage systems is guaranteed for various system configurations.
| System configuration | Update sequence of data in a higher system* | Guaranteed range of data consistency between secondary volumes |
|---|---|---|
| Open server only | Update sequence of data is guaranteed between servers | TC secondary volumes in multiple storage systems at secondary sites |
| * If the update sequence of data in a higher system is not guaranteed (data update sequence is unnecessary), data consistency between secondary volumes is not guaranteed. | ||