HP XP Continuous Access Software - Manual (Page 209)

Figure 89 Transferring Operations to the Primary Site in the Case of Failure in the Intermediate Site
Recovering from a Failure by Duplicating Volumes in a 3DC Cascading
Configuration
In the 3DC cascading configuration that consists of three Continuous Access Journal sites, if a
failure occures between the primary site and the intermediate site of the Continuous Access Journal
pair, the status of journal groups in the primary site and the intermediate site might remain Stopping
(the pair status is Suspending) to maintain the journal data for the delta resync operation. In this
case, perform the following procedure when you want to continue business tasks by duplicating
volumes in the primary site.
•
When duplicating volumes by using a pair between the primary site and the intermediate site.
Delete all Continuous Access Journal pairs which use the journal group in the primary site for
performing the delta resync operation. Confirm that the status of the journal group between
the primary site and the intermediate site changed to Stop, remove the error, and then resync
Continuous Access Journal pairs between the primary site and the intermediate site.
•
When duplicating volumes by using a pair between the primary site and the secondary site.
You can perform the delta resync operation even if the status of the journal group between
the primary site and the intermediate site is Stopping. After you perform the delta resync
operation, the status of the journal group between the primary site and the intermediate site
changes to Stop.
Recovering from a Disaster in a 3DC Cascading Configurationof XP
Continuous Access Journal and XP Continuous Access Synchronous
If a disaster or failure occurs in the primary site in a 3DC cascading configuration, you can use
XP Continuous Access Synchronous secondary 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
so first you must transfer your business tasks from the primary site to the intermediate site.
To transfer your business tasks to the secondary site:
Recovering from a Failure by Duplicating Volumes in a 3DC Cascading Configuration 209