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© Copyright IBM Corp. 1999 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.