Understanding MVS log streams

Coupling facility log streams reside in the coupling facility and in either a data space in the IXGLOGR address space or in staging data sets. DASD-only log streams reside in a data space in the IXGLOGR address space and in staging data sets.

All log streams that are needed by CICS® must be defined to the MVS™ system logger before CICS can use them. You can either define log streams explicitly, or you can let CICS create them dynamically when they are first used. To enable CICS to create log streams dynamically, you first define model log streams to the MVS system logger. To define explicit log streams and model log streams, use the MVS IXCMIAPU utility.

For information about the coupling facility and defining log structures, see z/OS® MVS Setting Up a Sysplex. For information about defining coupling facility log structures and MVS log streams for use by CICS Transaction Server, see CICS System Definition Guide.


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Timestamp icon Last updated: Friday, 7 February 2014


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