InterSystems IRIS reports a variety of messages to the messages log file (messages.log), including: general messages; startup/shutdown, license, and network errors; certain operating system errors; and the success or failure of jobs started remotely from other systems. System Monitor also writes notifications to the messages log. The directory for messages.log can be configured (see console), but the default location is install-dir\mgr.
On Windows-based platforms, all console messages are sent to the messages log file, messages.log. On UNIX®/Linux platforms, you can configure console messages to be sent to the messages log file, the console terminal, or both.
The size of the messages.log file is monitored by System Monitor. The file grows until it reaches the configured maximum size, at which point InterSystems IRIS saves the file and starts a new one. See MaxConsoleLogSize for information about configuring the maximum messages log size.
You can view the messages log from the View Messages Log page of the Management Portal (System Operation > System Logs > Messages Log). If the messages log is larger than 1 MB, only the most recent 1 MB portion is displayed by the Management Portal. Click the Show entire file link to display the entire file, which may require some time if the file is very large.
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If you have trouble starting InterSystems IRIS, use any text editor or text viewer to view the messages log.