This documentation space contains information about PATROL Agents when deployed in a BMC Helix Operations Management environment. If you are a TrueSight Operations Management user, see PATROL Agent 22.1. Open link

PATROL event log

The PATROL Agent records events in a proprietary format. The latest events are stored in memory for quick access. This memory space is an array of structures that is called the PEM cache. As new events are created, older events are written to a log file called the PEM log. PATROL provides a utility that enables you to extract information about events from the log file. This topic details the following information:

Events stored

In the Standard Event Catalog, which is accessible through the console, you can determine whether an event is stored in the PEM log by setting the event's Life Expectancy. Storage options include delete if closed, delete if information, do not store, and store.

Contents of PATROL event log

The PATROL Agent Event log records the information shown in the following table for each event:

Information stored in event log

Information type


event ID

The order in which the event occurred


The event's current status


The type of event


The host from which the event originated


The monitored object that triggered the event

time and date

The time and date that the event occurred

event description

A brief description of the nature of the event

event diary

Comments about what triggered this event or what type of actions were taken in response to this event

Users add these comments and the event manager time-stamps each entry.

Location of PATROL event log files

The following table indicates the file name and path of the event log files:

Location of event log files

File description File and path for UNIX
File name and path for Windows
event log file PATROL_HOME/log/PEM_<host>_<port>.log
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