Using Serviceguard Extension for RAC, 9th Edition, September 2010

4 Maintenance and Troubleshooting
This chapter includes information about carrying out routine maintenance on a Real Application
Cluster configuration. Starting with version SGeRAC A.11.17, all log messages from cmgmsd
log to /var/adm/syslog/syslog.log by default. As presented here, these tasks differ in
some details from the similar tasks described in the Managing Serviceguard documentation.
Tasks include:
• “Reviewing Cluster and Package States with the cmviewcl Command”
• “Online Reconfiguration”
• “Managing the Shared Storage”
• “Removing Serviceguard Extension for RAC from a System”
• “Monitoring Hardware ”
• “Adding Disk Hardware ”
• “Replacing Disks”
• “Replacement of I/O Cards”
• “Replacement of LAN Cards”
Reviewing Cluster and Package States with the cmviewcl Command
A cluster or its component nodes may be in several different states at different points in time.
Status information for clusters, packages, and other cluster elements is shown in the output of
the cmviewcl command and in some displays in Serviceguard Manager. This section explains
the meaning of many of the common conditions the cluster or package may be in.
Information about cluster status is stored in the status database that is maintained on each
individual node in the cluster. You can display information contained in this database by issuing
the cmviewcl command:
# cmviewcl -v
The command when issued with the -v option displays information about the whole cluster.
See the man page for a detailed description of other cmviewcl options.
TIP: Some commands take longer to complete in large configurations. In particular, you can
expect Serviceguard’s CPU utilization to increase during cmviewcl -v as the number of packages
and services increases.
You can also specify that the output should be formatted as it was in a specific earlier release by
using the -r option indicating the release format you wish. Example:
# cmviewcl -r A.11.16
See the man page for a detailed description of other cmviewcl options.
Types of Cluster and Package States
A cluster or its component nodes may be in several different states at different points in time.
The following sections describe many of the common conditions the cluster or package may be
in.
Examples of Cluster and Package States
The following is an example of the output generated shown for the cmviewcl command:
CLUSTER STATUS
cluster_mo up
NODE STATUS STATE
Reviewing Cluster and Package States with the cmviewcl Command 109