IBM z13 Configuration Setup

Channel subsystem

This chapter presents an overview of the channel subsystem and includes these topics:

•Channel subsystem (CSS)

•Logical partitions (LPARs)

•Subchannel sets

•Channels

•Defining multiple CSSs and the fourth subchannel set

•Channel activation

•CPC drawer: Fanout cards and adapters

2.1 Channel subsystem (CSS)

The channels in the CSS allow the transfer of data between main memory and I/O devices or other platforms under the control of a channel program. Through these channel connections the CSS enables communication from main memory ...