Editing Z/VM

{{Short description|Computer operating system}}
{{Use dmy dates|date=December 2022}}
{{main article|VM (operating system)}}{{lowercase}}
{{Infobox OS
| name                   = z/VM
| logo                   = IBM logo.svg
| logo caption           = 
| logo size              = 120px
| screenshot             =
| caption                = z/VM running CMS fullscreen
| developer              = [[IBM]]
| family                 = VM family
| source_model           = [[Closed source]]
| working_state          = Current
| latest_release_version = 7.4 <!-- If you update this, don't forget to update [[Comparison of operating systems]]-->
| latest_release_date    = 20 September 2024<ref>{{Cite web |title=Introducing IBM z/VM 7.4 |date=6 August 2024 |url=https://www.vm.ibm.com/zvm740/}}</ref>
| kernel_type            =
| license                = [[Proprietary software|Proprietary]]
| website                = {{URL|www.ibm.com/products/zvm}}
}}
{{History of IBM mainframe operating systems|vm}}
'''z/VM''' is the current version in IBM's [[VM (operating system)|VM family]] of [[virtual machine]] [[operating systems]]. First released in October 2000,<ref>{{Cite web |title=IBM: VM 50th Anniversary |date=2 August 2022 |url=https://www.vm.ibm.com/history/50th/index.html}}</ref> z/VM remains in active use and development {{As of|2024|lc=on}}.<ref>{{cite book|url=https://www.vm.ibm.com/library/740pdfs/74628600.pdf|title=z/VM 7.4, General Information|publisher=IBM|date=2024}}</ref> It is directly based on technology and concepts dating back to the 1960s, particularly IBM's [[CP/CMS]] on the [[IBM System/360-67]] (see article [[History of CP/CMS]] for historical details). z/VM runs on IBM's [[IBM Z]] family of computers and can support large numbers (thousands) of Linux virtual machines. (See [[Linux on IBM Z]].)

On 16 September 2022, IBM released z/VM Version 7.3 which requires [[z/Architecture]], implemented in IBM's [[IBM zEnterprise System#zEnterprise EC12|EC12]], [[IBM zEnterprise System#zEnterprise BC12|BC12]] and later models.<ref>{{Cite web |title=Announcement |date=13 September 2022 |url=https://www.vm.ibm.com/zvm730/announce.html}}</ref>

==See also==
* [[OpenSolaris for System z]]
* [[PR/SM]]
* [[Time-sharing system evolution]]
* [[z/OS]]
* [[z/TPF]]
* [[z/VSE]]

==References==
{{FamilyTree CP/CMS|float=right}}

===Citations===
{{Reflist}}
; Primary CP/CMS sources:
{{Refbegin}}
* R. J. Creasy, "[http://pages.cs.wisc.edu/~stjones/proj/vm_reading/ibmrd2505M.pdf The origin of the VM/370 time-sharing system]", ''IBM Journal of Research &amp; Development'', Vol. 25, No. 5 (September 1981), ''pp.'' 483–90, [[PDF]]<br/>― perspective on [[CP/CMS]] and [[VM (operating system)|VM]] history by the [[IBM CP-40|CP-40]] project lead, also a [[Compatible Time-Sharing System|CTSS]] author
* E.W. Pugh, L.R. Johnson, and John H. Palmer, ''IBM's 360 and early 370 systems,'' MIT Press, Cambridge MA and London, {{ISBN|0-262-16123-0}}<br/>― extensive (819&nbsp;''pp.'') treatment of IBM's offerings during this period; the limited coverage of [[CP/CMS]] in such a definitive work is telling
* Melinda Varian, ''[http://www.leeandmelindavarian.com/Melinda/25paper.pdf  VM and the VM community, past present, and future]'', SHARE 89 Sessions 9059–61, 1997;<br/>― an outstanding source for [[CP/CMS]] and [[VM (operating system)|VM]] history
* Bitsavers, ''[http://bitsavers.org/pdf/ibm/360/cp67/ Index of /pdf/ibm/360/cp67]''
{{Refend}}

; Additional CP/CMS sources:
{{Refbegin}}
* R. J. Adair, R. U. Bayles, L. W. Comeau and R. J. Creasy, ''A Virtual Machine System for the 360/40,'' IBM Corporation, Cambridge Scientific Center Report No. 320‐2007 (May 1966)<br/>― a seminal paper describing implementation of the virtual machine concept, with descriptions of the customized CSC S/360-40 and the [[IBM CP-40|CP-40]] design
* International Business Machines Corporation, ''CP-67/CMS'', Program 360D-05.2.005, IBM Program Information Department (June 1969)<br/>― IBM's reference manual
* R. A. Meyer and L. H. Seawright, "A virtual machine time-sharing system," ''IBM Systems Journal,'' Vol. 9, No. 3, pp. 199–218 (September 1970)<br/>― describes the CP-67/CMS system, outlining features and applications
* R. P. Parmelee, T. I. Peterson, C. C. Tillman, and D. J. Hatfield, "Virtual storage and virtual machine concepts," ''IBM Systems Journal,'' Vol. 11, No. 2 (June 1972)
{{Refend}}

; Background CP/CMS sources:
{{Refbegin}}
* F. J. Corbató, et al., ''The Compatible Time-Sharing System, A Programmer’s Guide,'' M.I.T. Press, 1963
* F. J. Corbató, M. Merwin-Daggett, and R. C. Daley, "An Experimental Time-sharing System," ''Proc. Spring Joint Computer Conference (AFIPS) 21, pp.'' 335–44 (1962) — description of CTSS
* F. J. Corbató and V. A. Vyssotsky, "Introduction and Overview of the MULTICS System", ''Proc. Fall Joint Computer Conference (AFIPS) 27, pp.'' 185–96 (1965)
* P. J. Denning, "Virtual Memory", ''Computing Surveys'' Vol. 2, ''pp. '' 153–89 (1970)
* J. B. Dennis, "Segmentation and the Design of Multi-Programmed Computer Systems," ''JACM'' Vol. 12, ''pp.'' 589–602 (1965)<br/>― virtual memory requirements for Project MAC, destined for [[GE 645]]
* C. A. R. Hoare and R. H. Perrott, Eds., ''Operating Systems Techniques'', Academic Press, Inc., New York (1972)
* T. Kilburn, D. B. G. Edwards, M. J. Lanigan, and F. H. Sumner, "One-Level Storage System", ''IRE Trans. Electron. Computers EC-11, pp.'' 223–35 (1962)<br/>― Manchester/Ferranti [[Atlas Computer (Manchester)|Atlas]]
* R. A. Nelson, "Mapping Devices and the M44 Data Processing System," ''Research Report RC 1303'', IBM [[Thomas J. Watson Research Center]] (1964)<br/>― about the [[IBM M44/44X]]
* R. P. Parmelee, T. I. Peterson, C. C. Tillman, and D. J. Hatfield, "Virtual Storage and Virtual Machine Concepts", ''IBM Systems Journal'', Vol. 11, ''pp.'' 99–130 (1972)
{{Refend}}

; Additional on-line CP/CMS resources:
{{Refbegin}}
* febcm.club.fr — ''[http://febcm.club.fr/english/information_technology/information_technology_3.htm  Information Technology Timeline], 1964–74''
* www.multicians.org — Tom Van Vleck's short essay ''[http://www.multicians.org/thvv/360-67.html  The IBM 360/67 and CP/CMS]''
*  www.cap-lore.com — Norman Hardy's ''[http://cap-lore.com/Software/CP.html  Short history of IBM's virtual machines]''
*  www.cap-lore.com — Norman Hardy's [http://www.cap-lore.com/Hardware/Blaauw.html  short description of the "Blaauw Box"]
{{Refend}}

==External links==
* {{Official website|https://www.ibm.com/products/zvm}}
* [http://www.vm.ibm.com/eval/ IBM z/VM Evaluation Edition] (free download)

{{Virtualization products}}

{{DEFAULTSORT:Z Vm}}
[[Category:Virtualization software]]
[[Category:IBM mainframe operating systems]]


{{operating-system-stub}}
{{mainframe-compu-stub}}