Building Disaster Recovery Serviceguard Solutions Using Continentalclusters for Linux B.01.00.00

Verify data replication environment

You can use the cmdrprev command to preview the preparation of data replication environment

for an actual recovery can be previewed. The command identifies errors in data replication

environment which will potentially fail an actual recovery.

Run the following command on every node of the recovery cluster and verify that the command

returns a value 0.

# cmdrprev -p <recovery_package>

Move the recovery group into maintenance mode

Before starting the disaster recovery rehearsal operation, the recovery packages must be moved

into maintenance mode. This prevents startup of the recovery packages even if disaster recovery

is triggered during rehearsal operation.

# cmrecovercl -d -g <recovery_group_name>

Run the cmviewconclcommand to verify that the recovery group is in maintenance mode.

# cmviewconcl -v

Prepare the replication environment for DR rehearsal

Manually suspend the replication and enable write access to secondary mirror copy configured

for the package.

# pairsplit –g <device_group> -rw (in case of XP)

For every volume group that is configured for the package, delete the host id tag by running the

following command from any of the recovery cluster nodes.

Split the BC pair at recovery cluster.

# export HORCC_MRCF=1

# pairsplit –g <device_group> (in case of XP)

# unset HORCC_MRCF

Start rehearsal

To perfrom rehearsal operation on a recovery group, run the cmrecovercl command.

# cmrecovercl -r -g <recovery_group>

The cmrecovercl command runs the rehearsal package that is configured in the recovery group.

NOTE: Before starting the rehearsal, make any application configuration changes that might be

required due to the change in the client access IP address, which is now the rehearsal package IP

address. For example, in case of Oracle Single Instance application, reconfigure the listener to

listen on the rehearsal package IP address. See “ Precautions to be taken while performing DR

Rehearsal” (page 34) for the list of precautionary steps.

After the cmrecovercl command completes , run the cmviewcl command to verify that the

rehearsal packages are up.

Stop rehearsal package

After performing the rehearsal operations, the rehearsal package must be halted using the

cmhatlpkg command.

# cmhaltpkg <rehearsal_pkg>

Performing Disaster Recovery rehearsal in Continentalclusters 35