HP StorageWorks XP Remote Web Console Software - Manual (Page 67)

Continuous Access XP Journal user guide 67
2. Issue a request for creating a Continuous Access XP Synchronous pair to the primary array where
Continuous Access XP Synchronous is installed.
3. Wait until the status of the Continuous Access XP Synchronous pair becomes PAIR.
4. Issue a request for creating a Continuous Access XP Journal pair to the Continuous Access XP Journal
primary array.
When creating a Continuous Access XP Journal pair, ensure that you select a value from 1 to 3 as the
mirror ID.
5. Wait until the status of the Continuous Access XP Journal pair becomes PAIR.
NOTE: You must ensure that the Continuous Access XP Synchronous pair status changes to PAIR before
the Continuous Access XP Journal pair status changes to PAIR. If you made a request to a change the
Continuous Access XP Journal pair status to PAIR before the Continuous Access XP Synchronous pair status
changes to PAIR, the request is rejected.
For more information about installing and using Continuous Access XP Synchronous, see the
HP StorageWorks Continuous Access XP user guide for the XP12000/XP10000/SVS200. For more
information about Continuous Access XP Journal journal group configuration, see ” Journal group
operations ” on page 30. For more information about port configuration, see ” Configuring port attributes ”
on page 85.
Disaster recovery
If a disaster or failure occurs in the primary site in a 3DC cascading configuration, you can use
Continuous Access XP Synchronous secondary volumes in the intermediate site to enable the intermediate
site to take over your business tasks. If a disaster or failure occurs in the primary site, you must first transfer
your business tasks from the primary site to the intermediate site.
To transfer your business tasks to the secondary site:
1. Check the consistency of the Continuous Access XP Synchronous S-VOL in the intermediate site.
2. Use RAID Manager XP to execute the
horctakeover
command on the Continuous Access XP
Synchronous pair that exists between the primary and intermediate sites.
3. Wait until the Continuous Access XP Synchronous S-VOL in the intermediate site is suspended (in
SSWS status) or changed to a Continuous Access XP Synchronous P-VOL.
After the S-VOL is suspended or changed to a P-VOL, you can use the volume to resume your business
tasks.
For more information about using RAID Manager XP, see the HP StorageWorks RAID Manager XP user
guide.
When a disaster or failure occurs, this procedure enables you to resume your business tasks using the
Continuous Access XP Synchronous volume at the intermediate site. The Continuous Access XP
Synchronous volume at the intermediate site contains the same data that is stored in the Continuous
Access XP Synchronous P-VOL at the primary site.
For more information, see ”
Continuous Access XP Journal data volume pair status ” on page 31.
Combining Continuous Access XP Journal with Continuous Access XP Synchronous
(3DC multi-target configuration)
The local array can combine Continuous Access XP Journal and Continuous Access XP Synchronous. In a
system where Continuous Access XP Journal and Continuous Access XP Synchronous are combined, there
are one primary and two secondary sites. One secondary site is for synchronous remote copy, and is
usually located a short 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. This system configuration is called a
three data center (3DC) multi-target configuration.
A 3DC multi-target configuration provides a solution for disaster recovery and business continuity. Even
when a disaster or failure occurs at two sites at the same time, you can restart your business tasks using
data in the remaining secondary site.