Building Disaster Recovery Serviceguard Solutions Using Metrocluster with Continuous Access for P9000 and XP A.11.00

7 Administering Metrocluster
Administering a Metrocluster using Continuous Access XP/P9000
replication
Adding a node to Metrocluster
To add a node to Metrocluster with Continuous Access for P9000 and XP, use the following
procedure:
1. Add a node in the cluster by editing the Serviceguard cluster configuration file and applying
the configuration:
# cmapplyconf -C cluster.config
2. Create the RAID Manager configuration on the newly added node. For more information, see
“Creating the RAID Manager configuration” (page 19).
3. Update the HORCM_INST section in the RAID Manager instance file on nodes in the other
site with the information about the RAID Manager instance on the newly added node. Restart
the RAID Manager instance on nodes in the other site so that the new information in the
configuration file is read.
4. If node_name is set to “*” in Metrocluster package configuration, perform the following steps:
a. Create the Metrocluster package directory on the newly added node.
b. Copy Metrocluster environment file from one of the existing nodes to the same pathname
on the newly added node:
# rcp <package_directory>/<Metrocluster_environment_file>
<new_node_name>:<package_directory>
5. If you are using Metrocluster modular package and if the node names are explicitly specified
for node_name parameter in Metrocluster package configuration, then add the newly added
node in a Metrocluster package by editing the Metrocluster package configuration and
applying the configuration:
# cmapplyconf –P <package_config_file>
Node maintenance
Planned maintenance of nodes is treated the same as a failure by the cluster. If you take a node
down for maintenance, package failover and quorum calculation is based on the remaining nodes.
Make sure that nodes are brought down evenly at every site, and that enough nodes remain on-line
to form a quorum if a failure occurs.
Planned maintenance
There might be situations when the package must be brought down for maintenance purposes
without having the package move to another node. The following procedure is recommended for
normal maintenance of the Metrocluster package:
1. Stop the package with the appropriate Serviceguard command.
# cmhaltpkg pkgname
2. If there are changes to the package attributes, edit the configuration file, and then apply the
updated package configuration.
# cmapplyconf -P pkgname.config
3. Start the package with the appropriate Serviceguard command.
# cmmodpkg -e pkgname
Administering a Metrocluster using Continuous Access XP/P9000 replication 69