Subsystems

A subsystem is a single, predefined operating environment through which the system coordinates work flow and resource usage. i5/OS™ can contain several that are independent operating subsystems. The run-time characteristics of a subsystem are defined in an object that is called a subsystem description. IBM® supplies several subsystem descriptions that can be used with or without modification:

QINTER

Used for interactive jobs

QBATCH

Used for batch jobs

QBASE

Used for both interactive and communications batch jobs

QCMN

Used for communications batch jobs

QSERVER

File server system

QSYSWRK

Used for general system work

QUSRWRK

Used to run TCP/IP server jobs that do work on behalf of a specific user.

A new subsystem can also be defined with the Create Subsystem Description (CRTSBSD) command.

For more information about creating subsystems, see the Work Management book.