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HP P6000 Continuous Access Software User Manual

Page 94

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Transition from synchronous to asynchronous

The source DR group log cannot be

Logging

or

Merging

, and the destination DR group must

be available.

On the source and destination arrays, the disk groups specified for the logs must accommodate
the log's maximum size.

The DR group pair cannot be suspended, failsafe enabled, or performing a full copy. See

Suspension

,

Failsafe mode

, and

Full copy

.

Transition from asynchronous to synchronous

The DR group pair cannot be suspended.

The DR group log (with basic asynchronous) cannot be logging.

The transition from enhanced asynchronous does not occur until the source DR group log is
run down (merged) to the destination.

During a transition, the log is run down or merged to the destination and host I/O is
automatically throttled. See

I/O throttling

. The merging may cause an apparent delay in

completing the transition, but is expected behavior.

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DR groups