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Channel subsystem - Coggle Diagram
Channel subsystem
Multiple CSS structure
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For easier management, consider using the Hardware Configuration Definitions (HCD) tool to
build and control the IBM Z input/output configuration definitions
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Logical partitions are
defined for a CSS, not for a system
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CHPID numbers are unique within a CSS, but the same CHPID number can be reused within
all CSSes
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The role of the CSS is to control
communication between internal or external channels and control units and devices
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The channels in the CSS allow transfer of data between memory and I/O
devices or other servers under the control of a channel program
The CSS allows channel I/O operations to continue independently of other operations in the system, which allows other functions to resume after an I/O operation is initiated
The CSS also provides internal
channels for communication between logical partitions in a physical system