HP Serviceguard Extension for RAC (SGeRAC) manual Types of Cluster and Package States

5 Maintenance

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” (page 113)

•“Checking the Cluster Configuration and Components” (page 122)

•“Online Reconfiguration” (page 126)

•“Managing the Shared Storage” (page 127)

•“Removing Serviceguard Extension for RAC from a System” (page 130)

•“Monitoring Hardware ” (page 131)

•“Adding Disk Hardware ” (page 131)

•“Replacing Disks” (page 132)

•“Replacement of I/O Cards” (page 136)

•“Replacement of LAN Cards” (page 136)

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 -voption 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 -vas 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 -roption 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:

Reviewing Cluster and Package States with the cmviewcl Command 113