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10-8 Chapter 10 Usage Scenarios
Hitachi Universal Replicator for IBM /OS User’s Guide
Primary host
Master JNL VOL
Extended consistency group
Primary storage system 1
Primary data
volume
Write data
Master JNL VOL
Primary data
volume
Master JNL VOL
Primary storage system 3
Primary data
volume
Secondary data
volume
Restore JNL VOL
Secondary storage system 1
Secondary data
volume
Restore JNL VOL
Secondary storage system 2Primary storage system 2
Secondary data
volume
Secondary storage system 3
Journal group 1
Journal group 1
Journal group 2
Journal group 2
Journal group 3
Journal group 3
Restore JNL VOL
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 multi-primary and multi-
secondary storage systems configuration:
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..