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data volume, asynchronously with regards to writing from the host. Update sequence consistency is

maintained with the Continuous Access XP Journal secondary data volume.

Because writing from the Continuous Access XP Journal primary volume to the Continuous Access XP

Journal secondary volume is performed asynchronously with regards to writing from the host to the

primary volume, this conﬁguration prevents delays in the response to the host even if the Continuous

Access XP Journal primary and secondary sites are far from each other.

In addition, you can create a Continuous Access XP Journal pair for delta resync operations in 3DC

multi-target conﬁgurations by specifying:

• A Continuous Access XP Synchronous S-VOL in the Continuous Access XP Synchronous secondary

site as the Continuous Access XP Journal delta resync primary data volume

• The volume in the Continuous Access XP Journal secondary site as the Continuous Access XP

Journal delta secondary data volume

If you create a Continuous Access XP Journal pair for delta resync operations, you can resynchronize

the Continuous Access XP Journal pair using journal data already residing in the Continuous Access XP

Synchronous secondary site when a failure occurs in the primary site.

For more information about the hardware conﬁguration required for 3DC multi-target conﬁguration, see

Hardware conﬁgurations. For more information about the requirements to create a Continuous Access

XP Journal pair for delta resync operation, see Requirements for creating Continuous Access XP Journal

pairs for delta resync operations. For more information about the requirements to perform delta resync

operation, see Requirements for performing delta resync operations.

If a failure occurs in a Continuous Access XP Synchronous primary volume, which is also used as a

Continuous Access XP Journal primary data volume, you can resume your business tasks using the

Continuous Access XP Synchronous secondary volume. After resuming your business tasks, remove the

failure from the primary volume and transfer your business tasks back to the primary site. For more

information, see the following:

• Recovering from primary site failures

• Recovering from primary site failures (when performing delta resync operations)

• Changing to 3DC multi-target conﬁgurations after recovering from primary site failures

• Transferring business tasks from Continuous Access XP secondary sites to primary sites (in 3DC

cascading conﬁgurations)

• Transferring business tasks from Continuous Access XP secondary sites to primary sites (in 3DC

multi-target conﬁgurations)

• Transferring business tasks from Continuous Access XP secondary sites to primary sites (when

performing delta resync operations in 3DC multi-target conﬁgurations)

If a failure occurs in the primary volume and Continuous Access XP Synchronous secondary volume, you

can resume your business tasks using the Continuous Access XP Journal secondary data volume. After

resuming the your business tasks, remove the failure from the primary volume and Continuous Access

XP Synchronous secondary volume, and transfer your business tasks back to the primary site. For more

information, see Recovering from primary site and Continuous Access XP Synchronous secondary site

failures and Transferring business tasks from Continuous Access XP Journal secondary sites to primary

sites.

Hardware conﬁgurations

A3DCmulti-targetconﬁguration requires the following sites:

• Pr

imary site for Continuous Access XP Synchronous and Continuous Access XP Journal

• Secondary site for Continuous Access XP Synchronous

• Secondary site for Continuous Access XP Journal

ch site requires one local array. For Command View XP, a management station is also required.

HP recommends installing RAID Manager XP in the host computers at each site.

The following hardware conﬁguration is required for the local array at these sites:

Continuous Access XP Journal operations requirements and restrictions

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