Group Control System: Difference between revisions

Group Control System (GCS)
Developer	IBM
Marketing target	IBM mainframe computers
License	Proprietary

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Group Control System (GCS) is an operating system made by IBM, meant to run as a guest of VM.^[1] GCS is an integral component of the discontinued VM/SP (since VM/SP 4), VM/XA SP, VM/ESA and current z/VM IBM System product offerings.

Overview

GCS's purpose is to provide an environment to run some specific OS/MVS-based applications and networking middleware under VM. To this end, GCS provides a limited simulation of the OS/MVS APIs. While CMS, the usual VM guest, already has OS simulation, it is not extensive enough to run some applications such as VTAM.

Specifically, GCS provides OS multitasking support. In order to be able to spread the load over several virtual machines, GCS also implements a notion of group where each group member virtual machine can interact with one another.

To implement this, GCS uses several techniques:

A writable shared segment
IUCV communications between virtual machines
A recovery virtual machine, designed to clean up locks in the shared segments when virtual machines unexpectedly leave the group

GCS is not designed to be a multi-purpose user operating system such as CMS. For example, it does not allow for file editing.

Examples of programs designed to run under GCS are:

VM/VTAM : The VM implementation of the VTAM stack
RSCS : The Remote Spooling Communication Subsystem, which, when associated with an instance of VM/VTAM, can use SNA resources to communicate with other SNA/NJE hosts
NETVIEW : A networking monitoring service

References

^ "What GCS Is". IBM.

External links

z/VM 5.3 Group Control System

This operating-system-related article is a stub. You can help Wikipedia by expanding it.

This mainframe computer-related article is a stub. You can help Wikipedia by expanding it.

[1] "What GCS Is". IBM.

[1]

@@ Line 1: / Line 1: @@
+{{Short description|IBM operating system}}
-{{References}}
+{{More citations needed|date=November 2024}}
-'''Group Control System''' ('''GCS''') is an [[operating system]] made by [[IBM]], meant to run as a guest of [[VM (operating system)|VM]]. GCS is an integral component of the discontinued [[VM/SP]] (since VM/SP 4), VM/XA SP, [[VM/ESA]] and current [[z/VM]] IBM System product offerings.
+{{Infobox OS
+| name                   = Group Control System (GCS)<!-- Name of program or distribution -->
+| logo                   = <!-- filename only (no wikilink, no Image:/File:) -->
+| logo caption           =
+| logo size              =
+| logo alt               =
+| screenshot             = <!-- filename only (no wikilink, no Image:/File:) -->
+| caption                =
+| screenshot_size        =
+| screenshot_alt         =
+| collapsible            =
+| version of             = <!-- For articles about releases of operating systems ONLY -->
+| developer              = [[IBM]]<!-- Name of main developer or sponsor-->
+| family                 = <!-- "Unix-like" or "Microsoft Windows" -->
+| working state          = <!-- "Current", "Discontinued" (operating systems), or "No longer supported" (releases) -->
+| source model           = <!-- "Open source", "Closed source", or "Shared source" -->
+| released               =
+| discontinued           = <!-- DON'T use this for articles about releases of operating systems -->
+| RTM date               = <!-- {{Start date and age|YYYY|MM|DD|df=yes/no}} ONLY for articles about OS releases -->
+| GA date                = <!-- {{Start date and age|YYYY|MM|DD|df=yes/no}} ONLY for articles about OS releases -->
+| latest release version =
+| latest release date    =
+| latest preview version =
+| latest preview date    = <!-- {{Start date and age|YYYY|MM|DD|df=yes/no}} -->
+| marketing target       = [[IBM mainframes|IBM mainframe computers]]
+| programmed in          =
+| language               = <!-- Supported human languages (English, French, Italian, Arabic, ...) -->
+| update model           = <!-- APT, Windows Update, etc. -->
+| package manager        = <!-- dpkg, rpm, Windows installer, etc. -->
+| supported platforms    = <!-- IA-32, x64, Itanium, ARM, etc. -->
+| kernel type            = <!-- Hybrid, Monolithic, Microkernel, Exokernel, Nanokernel, etc. -->
+| userland               =
+| ui                     =
+| license                = [[Proprietary software|Proprietary]]
+| preceded by            =
+| succeeded by           =
+| website                = <!-- {{URL|www.example.org}} -->
+| support status         = <!-- For articles about releases of operating systems ONLY -->
+| other articles         =
+| prog_language          =
+}}
+{{History of IBM mainframe operating systems}}
+'''Group Control System''' ('''GCS''') is an [[operating system]] made by [[IBM]], meant to run as a guest of [[VM (operating system)|VM]].<ref>{{Cite web |title=What GCS Is | website=[[IBM]] |url=https://www.ibm.com/docs/en/zvm/7.2?topic=overview-what-gcs-is}}</ref> GCS is an integral component of the discontinued [[VM/SP]] (since VM/SP 4), VM/XA SP, [[VM/ESA]] and current [[z/VM]] IBM System product offerings.
+==Overview==
 GCS's purpose is to provide an environment to run some specific [[MVS|OS/MVS]]-based applications and networking [[middleware]] under VM. To this end, GCS provides a limited simulation of the OS/MVS APIs. While [[Conversational Monitor System|CMS]], the usual VM guest, already has OS simulation, it is not extensive enough to run some applications such as [[VTAM]].
@@ Line 18: / Line 62: @@
 * [[NETVIEW]] : A networking monitoring service
-==External references==
+== References ==
+{{reflist}}
-* [http://publibz.boulder.ibm.com/cgi-bin/bookmgr_OS390/BOOKS/HCSF5B20/CCONTENTS?SHELF=EZ2ZVM01&DN=SC24-6098-02&DT=20070419173550 z/VM 5.3 Group Control System]
+== External links ==
+* [https://archive.today/20121210084740/http://publibz.boulder.ibm.com/cgi-bin/bookmgr_OS390/BOOKS/HCSF5B20/CCONTENTS?SHELF=EZ2ZVM01&DN=SC24-6098-02&DT=20070419173550 z/VM 5.3 Group Control System]
+{{IBM operating systems}}
 {{DEFAULTSORT:Group Control System(Vm)}}
 [[Category:IBM mainframe operating systems]]
+[[Category:VM (operating system)]]
 {{operating-system-stub}}

v t e Operating systems by IBM
Supercomputer	INK CNK Red Hat Enterprise Linux
Server, mainframe	IBSYS BOS/360 TOS/360 TSS/360 RAX DOS/360 and successors VSE OS/360 and successors OS/VS1 SVS MVS OS/390 z/OS VM line ACP TPF CPF System/88 OS IBM i AIX zLinux DPCX DPPX SSP SRTOS Red Hat Enterprise Linux
Desktop, workstation	Textpack PC DOS DOS/V PC/IX AIX OS/2 AOS Red Hat Enterprise Linux
Point of sale	4680 OS 4690 OS
Projects	Taligent Workplace OS Monterey Trillian K42
Related	Fedora Linux
Category

History of IBM mainframe operating systems
Early mainframe computer OSes GM OS & GM-NAA I/O (1955) BESYS (1957) UMES (1958) SOS (1959) IBSYS (1960) MIT CTSS (1961) 7040/7044 Operating System (16/32K) (7040-PR-150) 1410/7010 Operating System (1410-PR-155)
Miscellaneous S/360 line OSes BOS/360 (1965) TOS/360 (1965) TSS/360 (1967) MTS (1967) ORVYL (1967) RACS (1965) RAX (1966) MUSIC (1972) MUSIC/SP (1985)
DOS/360 and successors (1966) DOS/360 (1965) DOS/VS (1972) DOS/VSE (1979) VSE/AF (1979) VSE/SP (1983, 1985) VSE/ESA (1991) z/VSE (2005) VSEⁿ (2021)
OS/360 and successors (1966) MFT (1966) MFT II (1968) OS/VS1 (1972) OS/VS1 BPE MVT (1967) 65MP OS/VS2R1 (SVS) (1972) MVS (OS/VS2R2 and later) (1974) MVS/SE (1978) MVS/SE 2 (1979) MVS/SP Version 1 (1980) MVS/XA (1983) MVS/ESA (1988) OS/390 (1995) z/OS (2000)
VM line CP-40 /CMS (1967) CP-67 /CMS (1967) VP/CSS (1968) VM/370 (1972) VM/BSE (BSEPP) VM/SE (SEPP) VM/SP (1980) VM/XA MA (1984) VM/XA SF (1985) VM/XA SP (1988) VM/ESA (1990) z/VM (2000)
TPF line ACP (1967) TPF (1979) z/TPF (2005)
UNIX and Unix-like UTS (1981) AIX/370 (1990) AIX/ESA (1991) MVS/ESA OpenEdition (1993) VM/ESA OpenEdition (1995) OS/390 UNIX System Services (1996) Linux (1999) z/VM OpenExtensions (2000) z/OS UNIX System Services (2001) OpenSolaris (2008)
v t e