Input/Output Configuration Program: Difference between revisions

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{{about|Input/Output Configuration Program|the IOCP API|Input/output completion port}}

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{{Technical|date=August 2010}}

{{Lead too short|date=December 2021}}

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{{Infobox software

| name = Input/Output Configuration Program

| title = Input/Output Configuration Program

| logo = <!-- [[File: ]] -->

| screenshot = <!-- [[File: ]] -->

| caption =

| collapsible =

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The '''Input/Output Configuration Program''' is a program on [[IBM mainframe]]s.{{When|date=December 2021}}

==History==

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| id = SA22-7085-1

| version = Second Edition

| date = January 1987}}</ref> mode, IBM changed the I/O architecture to allow the [[Channel Subsystem]] to handle the channel scheduling that the operating system handled in S/370 mode. The new I/O architecture used a 16-bit '''subchannel number''', a 16-bit '''device number''' and an 8-bit '''Channel Path Identifier''' ('''Channel Path Id''' or '''CHPID'''); the [[Channel Subsystem]] was responsible for mapping the '''subchannel number''' to the channel and device numbers, for queuing I/O requests and for selecting from the available paths.

| date = January 1987| postscript =

}}</ref> mode, IBM changed the I/O architecture to allow the [[Channel Subsystem]] to handle the channel scheduling that the operating system had to handle in S/370 mode. The new I/O architecture used a 16-bit '''Channel Path Id''' ('''CHPID'''); the [[Channel Subsystem]] was responsible for mapping the '''CHPID''' to the channel and device numbers, for queuing I/O requests and for selecting from the available paths. 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 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.

Starting with [[IBM Z#IBM zSeries family|z990]], IBM introduced the concept of a '''Logical Channel Subsystem'''<ref>{{cite manual

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/>

| title = IBM IBM eServer zSeries 990 Technical Guide

| id id = GA22SG24-71236947-1001

| date id = GC38-0401May 2004

| edition = Second

| section = 4.1 Multiple Logical Channel Subsystem (LCSS)

| section-url = https://www.redbooks.ibm.com/redbooks/pdfs/sg246947.pdf#page=122

| pages = 110–115

| url = https://www.redbooks.ibm.com/redbooks/pdfs/sg246947.pdf

| access-date = May 29, 2023

}}

</ref> ('''LCSS'''); each physical channel (of 1024) has a unique '''Physical Channel Path Identifier''' ('''PCHPID'''), each LCSS has a CHPID to PCHPID mapping and each LPAR is assigned to one LCSS.

Starting with [[System z9]] running [[z/OS]] 1.7, IBM offered the multiple-subchannel set facility, which allowed up to four independent sets of 64 Ki subchannels.<ref>{{cite manual

<!-- Note - standard section headins are as below. We do not have External References: -->

| title = Multiple Subchannel Sets: An Implementation View

| url = https://www.redbooks.ibm.com/redpapers/pdfs/redp4387.pdf

| publisher = [[IBM]]

| work = Redpapers

| access-date = May 28, 2023

}}

</ref>

}}</ref> mode, IBM changed the I/O architecture to allow the [[Channel Subsystem]] to handle the channel scheduling that the operating system had to handle in S/370 mode. The new I/O architecture used a 16-bit '''Channel Path Id''' ('''CHPID'''); the [[Channel Subsystem]]installation was responsible for mappingdefining the '''CHPID''' to the channel and device numbers, for queuing I/O requests and for selecting from the available paths. 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 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/>(HCD).

==See also==

* [[Channel I/O]]

* [[Computer types]]

* [[History of computing]]

* [[Mainframe computer]]

* [[Timeline of computing]]

==References==

<!--- 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 author = IBM

{{cite manual

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

| author = IBM

|id id = GC38GA22-00977123-05 10

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

| version = SixthEleventh Edition

| id = GA22-7123-10

|date version = EleventhAugust Edition1993

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

| date = August 1993

}}{{Dead link|date=September 2024 |bot=InternetArchiveBot |fix-attempted=yes }}</ref>

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

</ref>

<ref name=GA22-7525>

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| url=http://publibz.boulder.ibm.com/epubs/pdf/iea2g890.pdf}}

</ref>

<ref name=GC28-1615>{{cite manual

|author = IBM

{{cite manual

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

|id = GC28-1615-04

|url url = http://publibfp.dhe.ibm.com/cgi-bin/bookmgr/BOOKS/da4a4001IEA4G702/CCONTENTS}}?DT=19930625065231

| version = Fifth Edition

|date date = AugustMarch 1993

}}{{Dead link|date=September 2024 |bot=InternetArchiveBot |fix-attempted=yes }}</ref>

<ref name=GC38-0097>{{cite manual

|author = IBM

|id = GC38-0097-05

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

|date date = February 1993

|version = Sixth Edition

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

}}{{Dead link|date=September 2024 |bot=InternetArchiveBot |fix-attempted=yes }}</ref>

<ref name=GC38-0401>{{cite manual

| author = IBM

| title = MVSInput/ESA: MVSOutput Configuration Program MVS/ESA System Product: JES2User's VersionGuide 4and JES3ESCON VersionChannel-to-Channel 4Reference

| id = GC28-1615GC38-040401

| url = http://publibfp.dhe.ibm.com/cgi-bin/bookmgr/BOOKS/IEA4G702da4a4001/CCONTENTS?DT=19930625065231

}}{{Dead link|date=March 2023 |bot=InternetArchiveBot |fix-attempted=yes }}</ref>

| version = Fifth Edition

| date = March 1993}}

</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 = February 1993

| version = Sixth Edition

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

</ref>

<ref name=GC38-0401>

{{cite manual

| author = IBM

| title = Input/Output Configuration Program User's Guide and ESCON Channel-to-Channel Reference

| id = GC38-0401

| url = http://publibfp.dhe.ibm.com/cgi-bin/bookmgr/BOOKS/da4a4001/CCONTENTS}}

</ref>

<ref name=GC38-0456>

{{cite manual

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== External links ==

*[https://archive.today/20121209075134/http://publibfp.dhe.ibm.com/cgi-bin/bookmgr/BOOKS/da4a4001/CCONTENTS Input/Output Configuration Program User's Guide and ESCON Channel-to-Channel Reference, GC38-0401-00]

*[https://archive.today/20121208184433/http://publibfp.dhe.ibm.com/cgi-bin/bookmgr/BOOKS/iea2g800/CCONTENTS z/OS V1R1.0 HCD Planning, GA22-7525-00]

{{DEFAULTSORT:Input Output Configuration Program}}