Designing Disaster Tolerant High Availability Clusters, 10th Edition, March 2003 (B7660-90013)

Physical Data Replication for ContinentalClusters Using Continuous Access XP
Failback Scenarios
Chapter 6316
NOTE In ASYNC mode, the package will halt unless a force flag is present or
unless the auto variable AUTO_SVOLPSUE is set to 1.
The fence level of the paired volume—NEVER, ASYNC, or DATA—will not
impact the starting of the packages at the recovery site. The CAXP
integration script will perform the following command with regards to
the paired volume:
# horctakeover -g <dev-grp-name> -S
Subsequently, the paired volume will have a status of SVOL_SWSS. To
view the local status of the paired volumes run:
# pairvolchk -g <dev-grp-name> -s
To view the remote status of the paired volumes, run
# pairvolchk -g <dev-grp-name> -c
(While the remote XP disk array and primary cluster systems are down,
the command will time out with an error code of 242.)
After power is restored to the primary site, or when a newly configured
array is brought online, the XP paired volumes may have either a status
of PVOL_PSUE on the primary site or SVOL_SWSS on the secondary site.
The following procedure applies to this situation:
1. While the package is still running, issue the following command from
the recovery host:
# pairresync -g <dgname> -c 15 -swaps
This starts the resynchronization, which can take a long time if the
entire primary disk array was lost or a short time if the primary
array was intact at the time of failover.
2. When resynchronization is complete, halt the ContinentalClusters
recovery packages at the recovery site using the command
# cmhaltpkg <pkg_name>
This will halt any applications, remove any floating IP addresses,
unmount file systems and deactivate volume groups as programmed
into the package control files. The status of the paired volumes will
remain SVOL_PAIR at the recovery site and PVOL_PAIR at the
primary site.