HP Serviceguard Metrocluster with EMC SRDF for Linux B.01.00.00

5 Administering Metrocluster
Adding a node to a Metrocluster
To add a node to Metrocluster with EMC SRDF for Linux:
1. Add the node in a cluster by editing the Serviceguard cluster configuration file and applying
the configuration:
# cmapplyconf -C cluster.config
2. Configure the device groups or consistency groups used by the Metrocluster packages on the
newly added node. For more information, see “Creating Symmetrix device groups” (page 12)or
“Creating the consistency groups” (page 20).
3. If the node_name is set to “*” in Metrocluster package configuration, perform the following
steps:
a. Create the Metrocluster package directory on the newly added node in the package
configuration
4. 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>
Maintaining a cluster
While the cluster is running, all EMC Symmetrix disk arrays that belong to the same Serviceguard
package, and are defined in a single SRDF group must be in the same state at the same time.
Manual changes of these states can cause the package to halt due to unexpected conditions. HP
recommends that you do not manually change the states while the package and the cluster are
running.
There might be situations when the package has to be brought down for maintenance purposes
without having the package move to another node.
The following procedure is for normal maintenance of Metrocluster EMC SRDF:
1. Stop the package with the appropriate Serviceguard command.
# cmhaltpkg pkgname
2. Split the logical SRDF links for the package.
symrdf -g <Device Group Name> split
3. Distribute the Metrocluster EMC SRDF configuration changes.
# cmapplyconf -P pkgconfig
4. Restore the logical SRDF links for the package.
symrdf -g <Device Group Name> establish
5. Start the package with the appropriate Serviceguard command.
# cmmodpkg -e pkgname
The status of the SA/FA ports is not verified.
Planned maintenance is treated the same as a failure by the cluster. If the node is brought down
for maintenance, package failover and quorum calculation is based on the remaining nodes.
Ensure that the nodes are brought down evenly at each site, and enough nodes remain on-line to
form a quorum if a failure occurs.
34 Administering Metrocluster