IBM SG24-5131-00 manual Cluster Troubleshooting, Cluster Log Files, 143

Chapter 7. Cluster Troubleshooting

Typically, a functioning HACMP cluster requires minimal intervention. If a problem occurs, however, diagnostic and recovery skills are essential. Thus, troubleshooting requires that you identify the problem quickly and apply your understanding of the HACMP for AIX software to restore the cluster to full operation.

In general, troubleshooting an HACMP cluster involves:

•Becoming aware that a problem exists

•Determining the source of the problem

•Correcting the problem

Becoming aware of a problem is often through system messages on the console, end-users complaining about slow or unavailable services or through some sort of monitoring of your cluster. When an HACMP for AIX script or daemon generates a message, the message is written to the system console and to one or more cluster log files. Messages written to the system console may scroll off screen before you notice them. The following paragraphs provide an overview of the log files, which are to be consulted for cluster troubleshooting, as well as some information on specific cluster states you may find there.

7.1 Cluster Log Files

HACMP for AIX scripts, daemons, and utilities write messages to the following log files:

Table 21. HACMP Log Files

	Log File Name	Description
	/var/adm/cluster.log	Contains time-stamped, formatted messages generated by
		HACMP for AIX scripts and daemons. In this log file, there
		is one line written for the start of each event, and one line
		written for the completion.
	/tmp/hacmp.out	Contains time-stamped, formatted messages generated by
		the HACMP for AIX scripts. In verbose mode, this log file
		contains a line-by-line record of each command executed
		in the scripts, including the values of the arguments passed
		to the commands. By default, the HACMP for AIX software
		writes verbose information to this log file; however, you can
		change this default. Verbose mode is recommended.
© Copyright IBM Corp. 1999		143