HP StorageWorks XP24000 Continuous Access Journal Software User and Reference Guide, v01 (T5278-96001, June 2007)

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• The storage system must have a volume used a s both a Continuous Access Synchronous

primary volume and a Continuous Access Journal primary data volume.

• The storage system must have a Continuous Access Journal master journal volume.

• Storage system at the Continuous Access Synchronous secondar y s ite:

• The storage system must have Continuous Access Synchronous installed.

• The storage system must have Continuous Access Journal installed.

• The storage system must have a Continuous Access Synchronous secondary volume.

Note:

This volume might be used as a Continuous Access Journal primary data

volume when disaster recovery is performed at the primary site. For details, see

“Recovering from a Disaster at the Primary Site in a 3DC Multi-Target Conﬁguration” on page 147.

• The storage system must have a Continuous Access Journal m aster journal volume.

Note:

This

volume might be necessary for creating a Continuous Access Journal pair when d isaster

recovery is performed at the primary site

• Storage system at th e Continuous Access Journal secondary site:

• The storage system must have Continuous Access Journal installed.

• The storage system must have a Continuous Access Journal secondary data volume.

• The storage system must have a Continuous Access Journal restore journal volume.

Setup Procedure

This section explains the procedure for setting up a 3D C multi-target conﬁguration using Continuous

Access Synchronous and Continuous Access Journal.

To set up a

3DC

multi-target conﬁguration:

1. Install

Continuous Access Synchronous a nd Continuous Access Journal. Conﬁgure the por ts and

journal

groups. Journal groups must be conﬁg ured for the storage systems at the three sites.

2. At the primary site, create a Continuous Access Synchronous pair.

3. Wait until the status of the Continuous Access Synchronous pair becomes PAIR.

4. At the p

rimary site, create a Continuous Access Journal pair.

When

creating a Continuous Access Journal pa ir, be sure to select a value from 1 to 3 as the

mirror ID.

5. Wait un

til

the status of the Continuous Access Journal pair becomes PAIR.

For detailed information about installing and using Continuous Access Synchronous, see H P StorageWorks

XP24000 Continuous Access Software User and Reference Guide.

For detailed information about Continuous Access Journal journal group conﬁgurations, see

“Journal Group Operations” on page 28. For detailed information about port conﬁgurations, see

“Conﬁguring Port Attributes” on page 96.

Changing to a 3DC Multi-tar get Conﬁgurati on after Recovering from Primary Site Failures

If you follow the instructions in

“Recovering from a Disaster at the Primary S ite in a 3DC Multi-Target Conﬁguration” on page 147

and then the system does not change to a 3DC cascading con ﬁg uration, you c a n change

the

system to a 3DC multi-target con ﬁ guration after removing failures from the primary site

and

other locations. In the resulting 3DC multi-target con ﬁguration, the former Continuous

Access secondary volume will be the primary volume.

To change the system to a 3DC multi-target conﬁguration:

1. Use RAID Manager to release the former Continuous Access Journal pair.

2. If pair resynchronization has n ot been performed to reverse the primary/secondary relationship

of a Continuous Access Synchronous pair (that is, if the pair is suspended), use R AID Ma n ager

to resynchronize the pair, so that the primary/secondary relationship will be reversed.

XP24000 Continuous Access Journal Software User a nd Reference Guide