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IBM System Logger Requirements

To define a Log Stream, the IBM System Logger must be active. The IBM manual MVS Setting up a Sysplex provides all the necessary information required to setup the System Logger facility.

This document assumes that:

• A System Logger is active in a SYSPLEX (MONO, LOCAL, or Full SYSPLEX).
• The IXGLOGR started task is active.
• Logger policies are defined.

If these requirements are not met, the Internal Logger will write until the Logger dataspace is full, reset to the start, and overwrite the dataspace. The amount of logging data available will be limited to the size of the Logger dataspace. The size of the Logger dataspace is controlled by the LogDataspaceSize attribute in the Parmlib Startup Options Section.

To determine if the IBM System Logger is active, issue the IBM D LOGGER console command. An active logger will display as follows:

IXG601I   09.36.12  LOGGER DISPLAY
SYSTEM LOGGER STATUS              
 SYSTEM   SYSTEM LOGGER STATUS    
 ------   --------------------    
 XE61     ACTIVE