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

1. Install Continuous Access Synchronous and Continuous Access Journal. Conﬁgure the ports

and journal groups.

2. Issue a request for creating a Continuous Access Syn chronous pair to the primary storage system

where Continuous Access Synchronous is installed.

3. Wait until the status of the Continuous Access Synchronous pair b e com es PAIR.

4. Issue a request for creating a Continuous Access Journal pair to the Continuous Access Journal

primary storage system.

When

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

mirror ID.

5. Wait until the status of the Continuous Access Journal pair becomes PAIR.

Note:

You must ensure tha t the Continuous Access Synchronous pair status changes to PAIR before the

Continuous Access Journal pair status changes to PAIR. If you have made a request for changing the

Continuous Access Journal pair status to PAIR before the Continuous Access Synchronous pair status

changes to PAIR, the request will be rejected.

For detailed information about installing and using Continuous Access Synchronous, see Hitachi TrueCopy

forz/OSUserand ReferenceGuide. For detailed information about Continuous Access Journal journal

group con ﬁgurations, see “Journal Group Operations” on page 28. For detailed i nformation about port

conﬁgurations, see “Conﬁguring Port Attributes”onpage96.

Continuo

Access Synchronous (3DC Multi-target Conﬁguration)

The stora

system provides a function to combine Continuous Access Journal and Continuous Access

Synchronous. In a system where Continuous Access Journal and Continuous Access Synchronous are

combined, there are one primary site and two secondar y sites. One of the secondary sites is for

synchron

ous remote copy, and is usually located a shor t distance from the primary site. The other

secondary site is for asynchronous remote copy, and is usually located a long distance from the primary

site. Such a system conﬁguration is called a three da ta center (3D C) multi-target conﬁguration.

A3DC multi-target conﬁguration provides a solution for disaster recovery and business continuity. Even

when a disaster or failure occurs at t wo sites at the same time, you can restart your business tasks by

using the data in the remaining secondary site.

The ﬁgure below illustrates a 3DC multi-target conﬁg u ration where Continuous Access Journal and

Continuous Access Synchronous are combined. In this conﬁguration, there are three sites as follows:

• Prima

ry site for b oth Continuous Access Synchronous and Continuous Access J ournal

• Secondary s ite for Continuous Access Synchronous

• Secondary site for Conti nuous Access Journal

XP24000 Continuous Access Journal Software User a nd Reference Guide