IBM SG24-5131-00 manual Cluster Management and Administration, Monitoring the Cluster, 151

Chapter 8. Cluster Management and Administration

This chapter covers all aspects of monitoring and managing an existing HACMP cluster. This includes a description of the different monitoring methods and tools available, how to start and stop the cluster, changing cluster or resource configurations, applying software fixes, user management, and other things.

8.1 Monitoring the Cluster

By design, HACMP for AIX compensates for various failures that occur within a cluster. For example, HACMP for AIX compensates for a network adapter failure by swapping in a standby adapter. As a result, it is possible that a component in the cluster could have failed and that you would be unaware of the fact. The danger here is that, while HACMP for AIX can survive one or possibly several failures, a failure that escapes your notice threatens a cluster’s ability to maintain a highly available environment.

HACMP for AIX provides the following tools for monitoring an HACMP cluster:

•The /usr/sbin/cluster/clstat utility, which reports the status of key cluster components—the cluster itself, the nodes in the cluster, and the network adapters connected to the nodes.

•The HAView utility, which monitors HACMP clusters through the NetView for AIX graphical network management interface. It lets users monitor multiple HACMP clusters and cluster components across a network from a single node.

•The SMIT Show Cluster Services screen, which shows the status of the HACMP for AIX daemons

•The following log files: the /var/adm/cluster.log file, which tracks cluster events, the /tmp/hacmp.out file, which records the output generated by configuration scripts as they execute, the /usr/sbin/cluster/history/cluster.mmdd log file, which logs the daily cluster history, and the /tmp/cspoc.log file, which logs the status of C-SPOC commands executed on cluster nodes.

When you monitor a cluster, use the clstat utility to examine the cluster and its components. Also, constantly monitor the /tmp/hacmp.out file. Use the SMIT Show Cluster Services screen to make sure that the necessary HACMP for AIX daemons are running on each node. Finally, if necessary, examine the other cluster log files to get a more in-depth view of the cluster status.

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