Logical partition: Difference between revisions

Revision as of 08:07, 23 July 2020

Revision as of 08:25, 24 September 2020

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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 |firstpublisher=Copyright [[IBM Corp. |last=1990, 2002]]}}</ref> IBM introduced the Start Interpretive Execution (SIE) instruction (designed specifically for the execution of virtual machines) as part of 370-XA architecture on the 3081, as well as VM/XA versions of VM to exploit it. [[PR/SM]] is a type-1 Hypervisor based on the CP component of VM/XA that runs directly on the machine level and allocates system resources across LPARs to share physical resources. It is a standard feature on [[IBM System z]] only. An IBM POWER system uses PHYP (the POWER Hypervisor) to enable its LPAR functionalities for System p and System i since approximately 2000 in POWER4 systems.

The terms ''PR/SM'' and ''LPAR'' are often used interchangeably in IBM Z, including in IBM documentation. Formally, LPAR designates the logical partitioning function and mode of operation, whereas PR/SM is the commercial designation of the feature.<ref>{{cite web |url=http://www.redbooks.ibm.com/redpieces/pdfs/sg247803.pdf |title=Security on the Mainframe |date=2009-12-02 |accessdate=2010-04-06 |first=Karan |last=Singh |url-status=dead |archiveurl=https://web.archive.org/web/20110617113238/http://www.redbooks.ibm.com/redpieces/pdfs/sg247803.pdf |archivedate=2011-06-17 }}, page 83</ref>