HP XP Continuous Access Software - Manual (Page 209)

Figure 87 Recovery from Failure in the Primary Site (When Delta Resync Operation is Performed)
Recovering from Primary Site Failures in XP Continuous Access Journal
3DC Cascading configuration
If a disaster or failure occurs in the primary site in a 3DC cascading configuration combining XP
Continuous Access Journal sites, you can use XP Continuous Access Journal primary data 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, first you must transfer your business tasks from the primary site
to the intermediate site. To transfer your business tasks to the intermediate site, complete the
following procedure. RAID Manager is used in this procedure:
1. Use RAID Manager to execute the horctakeover command onto the XP Continuous Access
Journal pair that exists between the primary site and the intermediate site.
2. Check the execution result of the horctakeover command.
3. Wait until the XP Continuous Access Journal secondary data volume in the intermediate site
becomes suspended (in SSWS status) (Lower-right figure in
“Transferring Operations to the
Intermediate Site from the Primary Site in the Case of Failure” (page 210) ) or changes into a
XP Continuous Access Journal primary data volume (Upper-right figure in “Transferring
Operations to the Intermediate Site from the Primary Site in the Case of Failure” (page 210) ).
After the secondary data volume becomes suspended or changes into the XP Continuous
Access Journal primary data volume, you can use the volume to resume your business tasks.
Recovering from Primary Site Failures in XP Continuous Access Journal 3DC Cascading configuration 209