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Chapter 23. Global Mirror options and configuration 275
volumes from the Global Mirror session, Global Copy keeps running and replicating newly
arrived write I/Os over the paths to the remote storage disk subsystem.
The termination of FlashCopy relationships, may be needed when you want to change the
FlashCopy targets within a Global Mirror configuration and choose, for example, another LSS
for the FlashCopy targets. This may be needed because you want to replace the FlashCopy
targets due to a skew in the load pattern in the remote storage disk subsystem. In this
situation you may pause the session before such activity, and then resume the session again
once the removal of the FlashCopy relationships is completed.
23.4 Remove a Global Mirror environment
To remove a Global Mirror environment and remove all traces of Global Mirror we
recommend the following sequence of steps:
1. Terminate the Global Mirror session.
2. Remove all Global Copy primary volumes from the Global Mirror session.
3. Close the Global Mirror session.
4. Withdraw all FlashCopy relationships between the B and C volumes.
5. Terminate all Global Copy pairs.
6. Remove the paths between the local and remote sites.
7. Remove the paths between the Master LSS and all related Subordinate LSSs.
Chapter 26, “Global Mirror examples” on page 341 has examples that illustrate how to
perform the listed steps.
23.5 Global Mirror with multiple storage disk subsystems
Figure 23-2 Define Global Mirror session to all potentially involved storage disk subsystems
Note: A pause command will complete a Consistency Group formation in progress. A stop
will immediately end the formation of Consistency Groups.
Local site
Primary
Primary
Primary
Primary
A
B
C
Primary
Primary
Primary
Primary
A
B
C
Network
Network
01
01
Define Global Mirror session
Define Global Mirror session
Remote site