Input/Output Configuration Program: Difference between revisions

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In the original [[IBM System/360|S/360]] and [[IBM System/370|S/370]] architectures, each processor had its own set of I/O channels and addressed I/O device were addressesdevices with a 12-bit ''cuu'' address, containing a 4-bit channel number and an 8-bit unit (device) number to be sent on the channel bus in order to select the device; the operating system had to be configured to reflect the processor and ''cuu'' address for each device. Initiating an I/O to a channel on a different processor required causing a [[shoulder tap]] interrupt on the other processor so that it could initiate the I/O.

Starting with the [[IBM 3081]] and [[IBM 4381]] in [[S/370 Extended Architecture]]<ref name=SA22-708>{{cite manual

Starting with the [[IBM 3081]] and [[IBM 4381]] in [[S/370 Extended Architecture]] mode, IBM introduced software configurable [[Channel Subsystem]]s, and allowed the operator to select an [[Input/Output Configuration Data Set]] (IOCDS) as part of of a [[Power On Reset]] (POR). Input/Output Configuration Program (IOCP)<ref name=GC38-0401/><ref name=GC38-0456/> is a program for IBM mainframes that compiles a description of the [[Channel Subsystem]] and [[LPAR]] configuration, optionally loading it into an [[Input/Output Configuration Data Set]] (IOCDS); it recognizes the syntax of [[MVS Configuration Program]] (MVSCP)<ref name=GC28-1615/> input, and there is no need to maintain separate input files.

| author = IBM

| title = IBM System/370 Extended Architecture Principles of Operation

| id = SA22-7085-1

| version = Second Edition

| date = January 1987

| separator = ,

| postscript =

Starting }}</ref> withmode, the [[IBM 3081]]changed andthe [[IBMI/O 4381]]architecture into [[S/370use Extendeda Architecture]]16-bit mode,'''Channel IBMPath introducedId''' software('''CHPID'''); configurablethe [[Channel Subsystem]]s, andwas allowedresponsible for mapping the operator'''CHPID''' to selectthe anchannel and device numbers. The installation was responsible for defining the [[Input/Output Configuration Data Set]]s ('''IOCDS''''s), and the operator could select a specific '''IOCDS''' as part of of a [[Power On Reset]] (POR). Input/Output Configuration Program (IOCP)<ref name=GC38-0097/><ref name=GC38-0401/><ref name=GC38-0456/> is a program for IBM mainframes that compiles a description of the [[Channel Subsystem]] and [[LPAR]]<ref name=GA22-7123/> configuration, optionally loading it into an [[Input/Output Configuration Data Set]] (IOCDS); it recognizes the syntax of [[MVS Configuration Program]] (MVSCP)<ref name=GC28-1615/> input, and there is no need to maintain separate input files.

The direct use of IOCP and [[MVS Configuration Program | MVSCP]] has been mostly supplanted by [[Hardware Configuration Definition | Hardware Configuration Definition (HCD)]]<ref name=GA22-7525/>

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<!--- See http://en.wikipedia.org/wiki/Wikipedia:Footnotes on how to create references using <ref></ref> tags which will then appear here automatically -->

{{Reflist | refs=

<ref name=GA22-7123>

{{cite manual

| author = IBM

| title = Enterprise System/9000 Enterprise System/3090: Processor Resource/Systems Manager Planning Guide

| id = GA22-7123-10

| version = Eleventh Edition

| date = August 1993

| url = http://publibfp.dhe.ibm.com/cgi-bin/bookmgr/FRAMESET/DA3A6010/CCONTENTS?DT=19930813120744

| separator = ,

}}

</ref>

<ref name=GA22-7525>

{{cite manual

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{{cite manual

| author = IBM

| title = MVS/ESA: MVS Configuration Program MVS/ESA System Product: JES2 Version 4 JES3 Version 4

| id = GC28-1615-04

| url = http://publibfp.dhe.ibm.com/cgi-bin/bookmgr/BOOKS/IEA4G702/CCONTENTS?DT=19930625065231

| version = Fifth Edition

| date = March 1993

| separator = ,

}}

</ref>

<ref name=GC38-0097>

{{cite manual

| author = IBM

| id = GC38-0097-05

| title = Enterprise System/9000 Enterprise System/3090: Input/Output Configuration Program User's Guide and ESCON Channel-to-Channel Reference

| date = Febuary 1993

| version = Sixth Edition

| url = http://publibfp.dhe.ibm.com/cgi-bin/bookmgr/FRAMESET/DA0A4005/CCONTENTS?DT=19930212144028

| separator = , }}

</ref>

<ref name=GC38-0401>