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Disclosed is a software algorithm that commences an optimally effective and timely S/370 I/O device configuration process.
English (United States)
This text was extracted from a PDF file.
This is the abbreviated version, containing approximately
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IPLable S/370 I/O CONFIGURATOR
Disclosed is a software algorithm that commences an optimally effective and
timely S/370 I/O device configuration process.
The term, 'I/O configuration', is used here to mean the process of deriving a
map of occupied device addresses and attached device types in an automatic
The S/370 architecture provides for matching I/O device rates (comparatively
slow) with CPU rates (comparatively fast) via I/O channels. I/O channels operate
independently of the CPU and independently of one another, thus allowing
parallel (simultaneous) activities to go on in the CPU and I/O subsystem.
Additionally, I/O channels may attach one or more control units to a system
where the control units have independent processing capabilities, thus allowing
parallel (simultaneous) activities to go on outboard of the channel.
To optimize the effectiveness and timeliness of the I/O
configuration process, the algorithm commencing the process takes
advantage of the parallelism implemented within the S/370
architecture. The algorithm is structured in the following manner: 1. Start 1st device on 1st control unit on 1st channel 2. Start 1st device on 1st control unit on 2nd channel 3. ...and so on for rest of channels on system 4. Start 1st device on 2nd control unit on 1st channel 5. Start 1st device on 2nd control unit on 2nd channel 6. ...and so on for rest of channels, and rest of control
units on channel 7. Start 2nd device on 1st control unit on 1st chann...