HP XP Continuous Access Software - Manual (Page 71)

In addition, you can create an XP Continuous Access Journal pair for delta resync operations in
3DC multi-target configurations by specifying:
•
A XP Continuous Access Synchronous S-VOL in the XP Continuous Access Synchronous
secondary site as the XP Continuous Access Journal delta resync primary data volume
•
The volume in the XP Continuous Access Journal secondary site as the XP Continuous Access
Journal delta secondary data volume
If you create an XP Continuous Access Journal pair for delta resync operations, you can
resynchronize the XP Continuous Access Journal pair using journal data already residing in the XP
Continuous Access 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 an XP
Continuous Access Journal pair for delta resync operation, see Requirements for creating XP
Continuous Access 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 an XP Continuous Access Synchronous primary volume, which is also used as
an XP Continuous Access Journal primary data volume, you can resume your business tasks using
the XP Continuous Access 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 via delta resync (50-08-xx or greater FW) (prior to
50-08-xx FW)” (page 76)
•
“Change to 3DC multi-target configuration after primary site failure” (page 78)
•
“Transfer tasks from XP Continuous Access secondary sites to primary sites (3DC cascade)”
(page 79)
•
Transfer tasks from C A XP secondary sites to primary sites
•
“Transfer tasks-DC1 without jrnl pr to DC1 with jrnl pr (delta resync/3DC multi-target)” (page
80)
If a failure occurs in the primary volume and XP Continuous Access Synchronous secondary volume,
you can resume your business tasks using the XP Continuous Access Journal secondary data volume.
After resuming the your business tasks, remove the failure from the primary volume and XP
Continuous Access Synchronous secondary volume, and transfer your business tasks back to the
primary site. For more information, see
Recovering from primary site and XP Continuous Access
Synchronous secondary site failures and Transferring business tasks from XP Continuous Access
Journal secondary sites to primary sites .
Hardware configurations
A 3DC multi-target configuration requires the following sites:
•
Primary site for XP Continuous Access Synchronous and XP Continuous Access Journal
•
Secondary site for XP Continuous Access Synchronous
•
Secondary site for XP Continuous Access Journal
Each site requires one local array. For XP Command View Advanced Edition Software, a
management station is also required. HP recommends installing XP RAID Manager in the host
computers at each site.
Combining XP Continuous Access Journal with other data management functions 71