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 |
| (VSP 5000 series) Open server/mainframe host mixed | Update sequence of data is guaranteed between open servers and mainframe hosts | TC, TCz secondary volumes in multiple storage systems at secondary sites |
| Update sequence of data is not guaranteed between open servers and mainframe hosts | No consistency between TC and TCz secondary volumes | |
| Update sequence of data is guaranteed between open servers | TC secondary volumes in multiple storage systems at secondary sites | |
| Update sequence of data is guaranteed between mainframe hosts | TCz secondary volumes in multiple storage systems at secondary sites | |
| (VSP 5000 series) Mainframe host only | Update sequence of data is guaranteed between mainframe hosts | TCz 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. | ||