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

Physical Data Replication for ContinentalClusters Using Continuous Access XP

Failback Scenarios

Chapter 6318

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 timeout with an error code of 242).

After power is restored to the primary site, the XP paired volumes may

have either a status of PSUE or SMPL. The procedure to switch the

functionality of the primary and recovery sites (i.e., the primary site

becomes the recovery site and the recovery site becomes the primary site)

is substantially the same in either case.

1. While the recovery packages are running, for each paired volume

with a status of PSUE, split the paired volume at the old recovery site

using

# pairsplit -g <dev-grp-name> -S

If the primary site paired volume status is currently SMPL proceed

to the next step.

2. For each paired volume manually recreate the volume using

# paircreate -g <dev-grp-name> -f <fence-level> -vl -c

synchronizing from the local (option -vl) side. Fence level may be

DATA, ASYNC, or NEVER. See the RM User Guide on more options for

the paircreate command.

3. Halt the monitor package at the recovery site. The recovery

packages should be running at this time.

4. Halt the monitor package at the primary site.

5. Reconfigure the ContinentalClusters configuration file. Section 1 is

not changed, unless systems are added, deleted or their names

changed or a cluster name is changed. In Section 2, reverse the

designation for the primary and recovery packages. Modify Section 3

only if different monitoring was defined for the original primary and

recovery sites. If the monitoring was equivalent no changes are

necessary.

6. Apply the new ContinentalClusters configuration file using: