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

Physical Data Replication for ContinentalClusters Using EMC SRDF
Failback Scenarios
Chapter 7 349
Dev RDev Typ:G SA RA LNK Mode Dom ACp Tracks Tracks Dev
RDev Pair
--- ---- ----- --------- ------------ ------ ------ ---
---- -------
000 000 R2:2 RW WD RW SYN DIS OFF 0 0 WD RW
Synchronized
001 001 R2:2 RW RW NR SYN DIS OFF 12 0 RW WD
Failed Over
002 002 R2:2 RW WD RW SYN DIS OFF 0 0 WD RW
Synchronized
003 003 R2:2 RW WD RW SYN DIS OFF 0 0 WD RW
Synchronized
004 004 R1:1 RW RW RW SYN DIS OFF 0 0 RW WD
Synchronized
005 005 R1:1 RW RW RW SYN DIS OFF 0 0 RW WD
Synchronized
006 006 R1:1 RW RW RW SYN DIS OFF 0 0 RW WD
Synchronized
007 007 R1:1 RW RW RW SYN DIS OFF 0 0 RW WD
Synchronized
After power is restored to the primary site, the Symmetrix device groups
may have either a status of Failed Over. The procedure to move the
application packages back to the primary site are different depending on
the status of the device groups at the primary site.
The following procedure applies to the situation where the primary site
device groups have a status of “Failed Over”:
1. Halt the ContinentalClusters recovery packages at the recovery site
using the following 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 device groups will
remain “Synchronized” at the recovery site and “Failed Over” at the
primary site.
2. Halt the cluster, which also halts the monitor package ccmonpkg.
3. Start the cluster at the primary site. Assuming they have been
properly configured the ContinentalClusters primary packages
should not start. The monitor package should start automatically.