WebSphere Application Server for z/OS uses a number of z/OS sysplex services. Therefore, each target system used to run WebSphere Application Server for z/OS must be either a monoplex (single system sysplex) or a member of a sysplex. For more information, see z/OS MVS Setting Up a Sysplex (SA22-7625).
Connect systems in a sysplex with channel-to-channel (CTC) communications or through a coupling facility, which is a special logical partition used to share data between sysplex members. Couple data sets on DASD are also used for sysplex coordination.
WebSphere Application Server for z/OS uses the System Logger, an MVS component that allows applications to log data in a sysplex, to log error and trace information and provide XA transaction logging. The System logger creates and manages log streams, which are written first to a coupling facility or local in-memory buffer, then transferred to log data sets on DASD for longer term access. Log streams that are written to local buffers rather than to a coupling facility are called DASD-only log streams.
Follow these steps to prepare your system for a sysplex.