IBM zEnterprise EC12 Technical Guide

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Central processor complex channel subsystem

This chapter addresses the concepts of the IBM zEnterprise EC12 (zEC12) channel subsystem, including multiple channel subsystems. Also described are the technology, terminology, and implementation aspects of the channel subsystem.

This chapter includes the following sections:

•Channel subsystem

•I/O configuration management

•Channel subsystem summary

•System-initiated CHPID reconfiguration

•Multipath initial program load (IPL)

5.1 Channel subsystem

The role of the channel subsystem (CSS) is to control ...

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