HP StorageWorks XP48 - Disk Array, Owner'S Manual

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70 HP SureStore E Disk Array XP512/XP48: Owner’s Guide
Disaster Recovery
Disaster recovery applications include Continuous Access XP and
Continuous Access Extension XP.
HP SureStore E Continuous Access XP
Continuous Access XP allows you to implement a disaster recovery plan by
providing a link between the failover controller/arbitrator and your disk
array to initiate, monitor, and report its status to the host.
Continuous Access software allows you to make a synchronous copy of a
remote data site, mirroring it to a remote site up to 27 miles (43 kilometers)
away. Remote Access includes host-specific software that enables you to
have full user control from the host server via a command-line interface.
HP SureStore E Continuous Access Extension XP
Continuous Access Extension XP enables a high-performance
asynchronous copy mode that allows confirmation of host write operations
between your local disk array and a remote disk array. These operations are
sequenced-stamped to ensure they are executed and sorted correctly at the
remote disk array.
You must purchase Continuous Access Extension as an upgrade if you are
currently using the Continuous Access XP in synchronous mode, but would
prefer to use asynchronous mode.