Channel subsystem overview
This chapter describes the zEC12 channel subsystem (CSS) which handles all the system input/output (I/O) operations for System z systems. The role of CSS is to control communication between internal or external channels and control units and devices.
The following topics are discussed:
CSS overview
Multiple CSS concept
I/O configuration management
I/O configuration planning
2.1 CSS description
CSS enables communication from system memory to peripherals via channel connections. The channels in the CSS permit transfer ...

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