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Draft Document for Review January 23, 2011 12:42 pm
there are certain additional constraints, such as same role, target, schedule, and so on). The
slave volume is automatically added to the consistency group on the remote XIV system.
In Figure 3-34, three active volume couplings that have completed initialization have been
moved into the active mirrored consistency group.
SITE 1
SITE 2
Production
DR Test/Recovery Servers
P/M
Consistency Group Peer
Primary Designation (P)
Master Role (M)
S/S
CG
Coupling/Mirror
Active
Consistency Group Peer
Secondary Designation (S)
Slave Role (S)
Figure 3-34 Consistency group mirror coupling
One or more additional mirrored volumes may be added to a mirrored consistency group at a
later time in the same way.
It is also important to realize that in a CG all volumes have the same role. Also, consistency
groups are handled as a single entity and, for example, in asynchronous mirroring, a delay in
replicating a single volume affects the status of the entire CG.
3.4.7 Normal operation: volume mirror coupling and CG mirror coupling
XIV mirroring normal operation begins after initialization has completed successfully and all
actual data on the master volume at the time of activation has been copied to the slave
volume. During normal operation, a consistent set of data is available on the slave volumes.
Normal operation, statuses, and reporting differ for XIV synchronous mirroring and XIV
asynchronous mirroring. Refer to Chapter 4, “Synchronous Remote Mirroring” on page 103,
and Chapter 5, “Asynchronous remote mirroring” on page 127, for details.
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IBM XIV Storage System: Copy Services and Migration