Write data
Primary host
| Extended consistency group |
Journal group 1 | Journal group 1 |
Primary data | Secondary data |
volume | volume |
Master JNL VOL | Restore JNL VOL |
Primary storage system 1 | Secondary storage system 1 |
Journal group 2 | Journal group 2 |
Primary data | Secondary data |
volume | volume |
Master JNL VOL | Restore JNL VOL |
Primary storage system 2 | Secondary storage system 2 |
Journal group 3 | Journal group 3 |
Primary data | Secondary data |
volume | volume |
Master JNL VOL | Restore JNL VOL |
Primary storage system 3 | Secondary storage system 3 |
Figure 10-1 Example 2: Remote Copy Operations Among Three Primary Storage Systems and Three Secondary Storage Systems
Disaster Recovery Procedure
The following is an example of the procedure that should be followed when a disaster or failure occurs in the primary site in
1.Switch operations from the primary site to the secondary site.
2.Reverse the copy direction, so that data are copied from the secondary site to the primary site.
3.After recovery of the primary host or storage system finishes, switch operations from the secondary site to the primary site.
This disaster recovery procedure is the same as when only one primary storage system and only one secondary storage system is used. For detailed procedure, see Error! Reference source not found..
Chapter 10 Usage Scenarios |
