HP XP Continuous Access Software - Manual (Page 69)

Setup procedure
This section explains the procedure for setting up a 3DC cascading configuration using XP
Continuous Access Synchronous and XP Continuous Access Journal.
1. Install XP Continuous Access Synchronous and XP Continuous Access Journal. Configure ports
and journal groups.
2. Issue a request for creating an XP Continuous Access Synchronous pair to the primary array
where XP Continuous Access Synchronous is installed.
3. Wait until the status of the XP Continuous Access Synchronous pair becomes PAIR.
4. Issue a request for creating an XP Continuous Access Journal pair to the XP Continuous Access
Journal primary array.
When creating an XP Continuous Access Journal pair, ensure that you select a value from 1
to 3 as the mirror ID.
5. Wait until the status of the XP Continuous Access Journal pair becomes PAIR.
NOTE: You must ensure that the XP Continuous Access Synchronous pair status changes to PAIR
before the XP Continuous Access Journal pair status changes to PAIR. If you made a request to a
change the XP Continuous Access Journal pair status to PAIR before the XP Continuous Access
Synchronous pair status changes to PAIR, the request is rejected.
For more information about installing and using XP Continuous Access Synchronous, see the HP
StorageWorks Continuous Access XP user guide for XP1024/XP128 Disk Arrays. For more
information about XP Continuous Access Journal journal group configuration, see
Journal group
operations . For more information about port configuration, see Configuring port attributes .
Disaster recovery
If a disaster or failure occurs in the primary site in a 3DC cascading configuration, you can use
XP Continuous Access 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 XP Continuous Access Synchronous S-VOL in the intermediate
site.
2. Use XP RAID Manager to execute the horctakeover command on the XP Continuous Access
Synchronous pair that exists between the primary and intermediate sites.
3. Wait until the XP Continuous Access Synchronous S-VOL in the intermediate site is suspended
(in SSWS status) or changed to an XP Continuous Access 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 XP RAID Manager, see the HP StorageWorks XP RAID Manager
user guide .
When a disaster or failure occurs, this procedure enables you to resume your business tasks using
the XP Continuous Access Synchronous volume at the intermediate site. The XP Continuous Access
Synchronous volume at the intermediate site contains the same data that is stored in the XP
Continuous Access Synchronous P-VOL at the primary site.
For more information, see XP Continuous Access Journal data volume pair status .
Combining XP Continuous Access Journal with XP Continuous Access Synchronous
(3DC multi-target configuration)
The local array can combine XP Continuous Access Journal and XP Continuous Access Synchronous.
In a system where XP Continuous Access Journal and XP Continuous Access Synchronous are
Combining XP Continuous Access Journal with other data management functions 69