The LOGR couple data set (LOGR policy)

The system logger component manages log streams based on the policy information that installations place in the LOGR couple data set. The LOGR couple data set must:

Be accessible by all the systems in the sysplex.
Be formatted using the IXCL1DSU utility.
Contain policy information, which is defined using the IXCMIAPU utility or the IXGINVNT service. (See z/OS MVS Programming: Assembler Services Guide for information about the IXGINVNT service.)

You can have only one LOGR policy for the sysplex, even if you have primary and alternate LOGR couple data sets. System logger will only use the policy information contained in the primary LOGR couple data set. Because there is only one LOGR policy allowed for a sysplex, you cannot specify the DEFINE POLICY NAME parameter in the LOGR policy, nor can you issue the SETXCF START,POLICY command to activate a policy. Updates made to the LOGR policy are made in the primary LOGR couple data set. If you switch to your alternate LOGR couple data set (making it now the primary LOGR couple data set), XCF had already copied and maintained the contents of the LOGR policy from the old primary couple data set into the new one.

The LOGR policy includes the following:

Log stream definitions.
Coupling facility list structure definitions, if applicable.
Data containing the current state of a log stream (for example, whether a log stream is currently connected to the coupling facility structure).

Formatting a LOGR couple data set and defining the LOGR policy are steps an installation must take to prepare for using a system logger application. See Preparing to use system logger applications.