Logical partition: Difference between revisions

Revision as of 19:36, 27 December 2024

Latest revision as of 07:30, 23 April 2025

(4 intermediate revisions by 4 users not shown)

Line 7:

== History ==

{{section rewrite|date=December 2024}}

[[IBM]] developed the concept of [[hypervisor]]s ([[virtual machine]]s in [[IBM CP-40|CP-40]] and [[CP-67]]) and in 1972 provided it for the [[IBM System/370|S/370]] as [[VM (operating system)|Virtual Machine Facility/370]].<ref>{{

cite book |url=http://www.vm.ibm.com/pubs/HCSF8A50.PDF |title=z/VMbuilt on IBM Virtualization Technology General Information Version 4 Release 3.0 |id=GC24-5991-04 |date=2002-04-12 |publisher=[[IBM]]}}</ref> IBM introduced the Start Interpretive Execution (SIE) instruction (designed specifically for the execution of virtual machines) in 1983 as part of [[IBM System/370-XA|370-XA]] architecture on the [[IBM 3081]], as well as VM/XA versions of VM to exploit it.

[[Amdahl Corporation]]'s Multiple Domain Facility (MDF) was introduced in 1982.<ref>{{cite journal |last1=Doran |first1=R.W. |title=Amdahl multiple-___domain architecture |journal=Computer |date=October 1988 |volume=21 |issue=10 |pages=20–28 |doi=10.1109/2.7054 |s2cid=1738798 |url=http://www-ti.informatik.uni-tuebingen.de/~spruth/edumirror/xx067.pdf |archive-url=https://web.archive.org/web/20170829211626/http://www-ti.informatik.uni-tuebingen.de/~spruth/edumirror/xx067.pdf |archive-date=2017-08-29}}</ref> IBM introduced its functionally similar PR/SM in 1988, implemented on its [[ESA/370]] architecture released that year with the [[IBM 3090]] processors.<ref>{{cite web|url=http://www.redbooks.ibm.com/redpapers/pdfs/redp5157.pdf|title=IBM Z Functional Matrix|author1=Frank Packheiser|author2=Octavian Lascu|author3=Bill White|page=18|publisher=[[IBM]]|date=2018}}</ref> PR/SM (Processor Resource/System Manager) is a type-1 [[Hypervisor]] (a [[virtual machine]] monitor) that allows multiple logical partitions to share physical resources such as [[Central processing unit|CPU]]s, memory, [[Channel I/O|I/O channels]] and LAN interfaces; the LPARs can share I/O devices such as [[direct access storage device]]s (DASD). Initially, the operator could select either basic mode or logical partition mode. PR/SM is integrated with all [[IBM System z]] machines. Formally, LPAR designates the mode of operation or an individual logical partition, whereas PR/SM is the commercial designation of the feature.<ref name="Singh"/>{{rp|83}}

MDF-based LPAR technology continued to be developed separately by Amdahl, and [[Hitachi Data Systems]] in part for their implementations of the new ESA/370 architecture, which featured the introduction of [[access registers]] that allowed use of multiple [[data space]]s addressable by a single [[address space]].

Line 58:

* [https://web.archive.org/web/20110617113238/http://www.redbooks.ibm.com/redpieces/pdfs/sg247803.pdf Security on the Mainframe], December 2009, by Karan Singh, Chapter 4. Virtualization, page 24 and page 83.

* [https://www-01.ibmtechknowledgedb.com/serverssystem-i-and-system-p/resourcelink/lib03030.nsf/web+search/0E6125F89F8B8EF6852572E6007E884D/$file/sa76-0098.pdf System i and System p: Logical Partitioning Guide]{{dead link|date=January 2018 |bot=InternetArchiveBot |fix-attempted=yes }}

* [httphttps://www-01.ibm.com/commondocs/ssien/cgi-binannouncements/ssialias?infotype=an&subtype=ca&appname=Demo&htmlfid=897archive/ENUS207-269 IBM System p Virtualization — The most complete virtualization offering for UNIX and Linux]

* [https://public.dhe.ibm.com/systems/power/docs/hw/p9/p9hat.pdf Power Systems Logical partitioning]

* [https://web.archive.org/web/20120304165859/http://www.hds.com/assets/pdf/hitachi-datasheet-compute-blade-logical-partitioning-lpar.pdf Hitachi Compute Blade LPARs]

* [http://www.fujitsu.com/downloads/PRMPWR/wp-xpar.pdf Fujitsu XPARs (SPARC)] and [http://www.fujitsu.com/global/services/computing/server/primequest/technology/io-partitioning.html "Flexible I/O and Partitioning" (x86_64)]