Play Video
1
Hitachi Compute Blade 500 Online Product Overview (OPO)
Hitachi Compute Blade 500 Online Product Overview (OPO)
::2014/09/12::
Play Video
2
Windows 8 Computer running low on Virtual Memory
Windows 8 Computer running low on Virtual Memory
::2012/10/19::
Play Video
3
VirtualBox - How to Resize a Partition Using Gparted in Knoppix
VirtualBox - How to Resize a Partition Using Gparted in Knoppix
::2014/05/01::
Play Video
4
CPU Management on HCB 2000 LPAR
CPU Management on HCB 2000 LPAR
::2012/09/18::
Play Video
5
PowerVM Live Partition Mobility
PowerVM Live Partition Mobility
::2010/07/23::
Play Video
6
Private Cloud Jump Start (02): Configure & Deploy Infrastructure Components
Private Cloud Jump Start (02): Configure & Deploy Infrastructure Components
::2013/06/03::
Play Video
7
Partitioning and formatting an external hdd for Xbox 360
Partitioning and formatting an external hdd for Xbox 360
::2013/01/05::
Play Video
8
Dual Boot Mac OSX and Windows 7 with Bootcamp
Dual Boot Mac OSX and Windows 7 with Bootcamp
::2012/01/02::
Play Video
9
create partitions for Mac OS X in windows 7
create partitions for Mac OS X in windows 7
::2012/05/08::
Play Video
10
Cassandra: Consistency & Tolerance (A Morality Guide for Databases)
Cassandra: Consistency & Tolerance (A Morality Guide for Databases)
::2014/07/11::
Play Video
11
AMD & Red Hat Demo Live Migration Across Vendor Platforms
AMD & Red Hat Demo Live Migration Across Vendor Platforms
::2008/11/05::
Play Video
12
(HOW-TO) LVM Virtual Server Host in Linux (CentOS 6.2)
(HOW-TO) LVM Virtual Server Host in Linux (CentOS 6.2)
::2012/01/08::
Play Video
13
Mainframe computer
Mainframe computer
::2014/07/20::
Play Video
14
Centos 6.4 installation full
Centos 6.4 installation full
::2013/04/12::
Play Video
15
Quick Guide: Installing MS-DOS 6.X on Virtual PC 2007
Quick Guide: Installing MS-DOS 6.X on Virtual PC 2007
::2014/11/14::
Play Video
16
Quick Guide: Installing MS-DOS 5.X on Virtual PC 2007
Quick Guide: Installing MS-DOS 5.X on Virtual PC 2007
::2014/11/04::
Play Video
17
Virtual PC 2007 - Windows 2000 Server SP4
Virtual PC 2007 - Windows 2000 Server SP4
::2014/06/30::
Play Video
18
isTek Virtualizzazione
isTek Virtualizzazione
::2011/11/21::
Play Video
19
Installing Linux On an External Hard Drive with VirtualBox
Installing Linux On an External Hard Drive with VirtualBox
::2014/02/16::
Play Video
20
CentOS 6.3 installation demo, Part 2 of 2
CentOS 6.3 installation demo, Part 2 of 2
::2012/11/07::
Play Video
21
IBM AIX
IBM AIX
::2014/08/25::
Play Video
22
IBM Data Set Commander for z/OS Overview
IBM Data Set Commander for z/OS Overview
::2014/04/07::
Play Video
23
Hypervisor
Hypervisor
::2014/07/23::
Play Video
24
Award Winning Microscope PC Hardware Diagnostics From Micro2000
Award Winning Microscope PC Hardware Diagnostics From Micro2000
::2013/02/22::
Play Video
25
LVM Configuration in Linux GUI - LVM RHEL 6 Video 6
LVM Configuration in Linux GUI - LVM RHEL 6 Video 6
::2011/11/23::
Play Video
26
Configuring the test environment for Solaris Volume Manager
Configuring the test environment for Solaris Volume Manager
::2014/07/19::
Play Video
27
Why 4K?
Why 4K?
::2012/10/30::
Play Video
28
Solución error ( initramfs ) al iniciar Linux Ubuntu 12.04 - 14.04 etc, LinuxMint.
Solución error ( initramfs ) al iniciar Linux Ubuntu 12.04 - 14.04 etc, LinuxMint.
::2011/12/13::
Play Video
29
Acer Aspire E 11 Review - Compared to HP Stream 11 - Under $200 Windows 8 Notebook Laptop PC
Acer Aspire E 11 Review - Compared to HP Stream 11 - Under $200 Windows 8 Notebook Laptop PC
::2014/11/01::
Play Video
30
How to Automatically Silence Your Android Phone While You
How to Automatically Silence Your Android Phone While You're Using?
::2014/01/28::
Play Video
31
Installing Mac OSX 10.6.1-10.6.2 on Intel and AMD.flv
Installing Mac OSX 10.6.1-10.6.2 on Intel and AMD.flv
::2011/09/23::
Play Video
32
High Performance I/O Virtualization for All Workloads on Exalogic
High Performance I/O Virtualization for All Workloads on Exalogic
::2012/09/24::
Play Video
33
Managing SAP on Power Systems with Cloud technologies delivers superior IT economics
Managing SAP on Power Systems with Cloud technologies delivers superior IT economics
::2012/02/08::
Play Video
34
Cloudslam09.com - Rob Gingell
Cloudslam09.com - Rob Gingell
::2009/05/26::
Play Video
35
Windows Server 2012 Network Virtualization
Windows Server 2012 Network Virtualization
::2013/07/29::
Play Video
36
Oracle 11g R2 database installation
Oracle 11g R2 database installation
::2013/10/09::
Play Video
37
What do the new IBM Power 7+ servers bring to the table for IBM Power Systems users?
What do the new IBM Power 7+ servers bring to the table for IBM Power Systems users?
::2013/02/08::
Play Video
38
2014 03 27 AIX Perf Tuning Part 2
2014 03 27 AIX Perf Tuning Part 2
::2014/03/27::
Play Video
39
Core / MicroCore / TinyCore - Linux manual command line install
Core / MicroCore / TinyCore - Linux manual command line install
::2014/03/27::
Play Video
40
Command line verification of a PowerHA SystemMirror Cluster - IBM Training
Command line verification of a PowerHA SystemMirror Cluster - IBM Training
::2013/09/25::
Play Video
41
Tips to Install CUCM 8/8.5 on VMWare ESXi 4.1; when getting "Estimated Time Exceeded"
Tips to Install CUCM 8/8.5 on VMWare ESXi 4.1; when getting "Estimated Time Exceeded"
::2011/04/27::
Play Video
42
DCIM: An Operator
DCIM: An Operator's Perspective, Digital Realty
::2013/06/07::
Play Video
43
A new open source strategy for Citrix XenServer
A new open source strategy for Citrix XenServer
::2013/06/25::
Play Video
44
Hard drive
Hard drive 'click of death' -- see it in action
::2007/03/15::
Play Video
45
QNX_6.3.0NC
QNX_6.3.0NC
::2009/06/04::
Play Video
46
Red Hat readies virtualization for RHEL 5
Red Hat readies virtualization for RHEL 5
::2007/11/01::
Play Video
47
Server Virtualization for Solaris 10
Server Virtualization for Solaris 10
::2009/03/23::
Play Video
48
Changing and Checking Your Queue Depth
Changing and Checking Your Queue Depth
::2013/12/27::
Play Video
49
Redhat Enterprise linux 5 File System-Part1
Redhat Enterprise linux 5 File System-Part1
::2011/09/03::
Play Video
50
Solaris 10 / OpenCSW packaging tutorial
Solaris 10 / OpenCSW packaging tutorial
::2012/12/16::
NEXT >>
RESULTS [51 .. 101]
From Wikipedia, the free encyclopedia
  (Redirected from LPAR)
Jump to: navigation, search
"LPAR" redirects here. For the theoretical computer science conference, see International Conference on Logic for Programming, Artificial Intelligence and Reasoning.

A logical partition, commonly called an LPAR, is a subset of computer's hardware resources, virtualized as a separate computer. In effect, a physical machine can be partitioned into multiple logical partitions, each hosting a separate operating system.[1]

History[edit]

IBM have developed the concept of hypervisors (virtual machines in CP-40 and CP-67) and in 1972 provided it for the S/370 as Virtual Machine Facility/370.[2] 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, System p, and System i machines.

The terms PR/SM and LPAR are often used interchangeably, 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.[3]

This technology was later developed separately by Amdahl, and Hitachi Data Systems for their implementations of the ESA/390 architecture in the mid 1980s; and continued by IBM for the System z and System i architectures. LPAR and PR/SM reconfigurations can be made without rebooting the computer, i.e., while some LPARs remain active. Reconfigurations can include changing channel path definitions and device definitions.

z/VM supports the z/Architecture HiperSockets function for high-speed TCP/IP communication among virtual machines and logical partitions (LPARs) within the same IBM zSeries server. This function uses an adaptation of the Queued-Direct Input/Output (QDIO) high-speed I/O protocol.

IBM later introduced LPARs to their midrange iSeries and pSeries servers in 1999 and 2001, respectively,[4] albeit with varying technical specifications. Multiple operating systems are compatible with LPARs, including z/OS, z/VM, z/VSE, z/TPF, AIX, Linux, and i/OS. In storage systems, such as the IBM TotalStorage DS8000, LPARs allow for multiple virtual instances of a storage array to exist within a single physical array.

In first part of 2010 year, Fujitsu announced availability of its x86 64 PRIMEQUEST line of servers,[5] which support LPARs.

In second part of 2011 year, Hitachi has announced availability of CB2000 and CB320 blade systems,[6] which support LPAR on x86 64 hardware.

Hardware partitioning[edit]

Logical partitioning divides hardware resources. Two LPARs may access memory from a common memory chip, provided that the ranges of addresses directly accessible to each do not overlap. One partition may indirectly control memory controlled by a second partition, but only by commanding a process in that partition. CPUs may be dedicated to a single LPAR or shared. While on Amdahl's MDF(Multiple Domain Feature) it was possible to configure an LPAR with both shared and dedicated CPUs. This is no longer possible with any mainframes flavours currently in the market.

On IBM mainframes, LPARs are managed by the PR/SM facility. IBM mainframes operate exclusively in LPAR mode, even when there is only one partition on a machine. Multiple LPARs running z/OS can form a Sysplex or Parallel Sysplex, whether on one machine or spread across multiple machines.[7]

On IBM System P Power hardware, LPARs are managed by the Power Hypervisor. The Hypervisor or PowerVM (formerly known as Advanced POWER Virtualization or APV) acts as a virtual switch between the LPARs and also handles the virtual SCSI traffic between LPARs. Micro-Partitioning supports 10 times as many LPARs as processors with fractional allocations. It was introduced with the POWER5 processor. All IBM POWER5 and POWER6 systems may be partitioned. Note that a full system partition may be defined where all resources are consumed by a single partition. System P servers with PowerVM enabled allow LPARs with shared CPUs to delegate their unused cycles into the shared pool. Dedicated processors are not available for sharing. Unused cycles become available for other partitions and are governed by the parameters specified when the LPAR is defined. Changes to a running partition can be made dynamically up to the maximum value set, and down to the minimum value set in the active profile. The changing of resource allocations without restart of the logical partition is called dynamic logical partitioning. IBM PowerVM is the licensed/purchased feature that enables the virtualization features on p4,5,6,7 series servers.[8][9]

LPARs safely allow combining multiple test, development, quality assurance, and production work on the same server, offering advantages such as lower costs, faster deployment, and more convenience. IBM mainframe LPARs are Common Criteria EAL5 certifiable, equivalent to physically unconnected servers, so they support the highest security requirements, including military use. Nearly all IBM mainframes run with multiple LPARs with the IBM System z9 and IBM System z10 supporting up to 60 LPARs.[7]

See also[edit]

References[edit]

  1. ^ Singh, Karan (2009-12-02). "Security on the Mainframe". Retrieved 2010-04-06. 
  2. ^ 1990, 2002, Copyright IBM Corp. (2002-04-12). z/VMbuilt on IBM Virtualization Technology General Information Version 4 Release 3.0. GC24-5991-04. 
  3. ^ Singh, Karan (2009-12-02). "Security on the Mainframe". Retrieved 2010-04-06. , page 83
  4. ^ Griffiths, Nigel (2005-06-29). "POWER5 Virtualization: How to set up the Virtual I/O Server". Retrieved 2008-09-25. 
  5. ^ Fujitsu Upgrades Lineup of PRIMEQUEST Mission-Critical Servers
  6. ^ Logical Partitioning Feature of CB Series Xeon servers Suitable for Robust and Reliable Cloud by H. Ueno at hds.com
  7. ^ a b Singh, Karan (2009-12-02). "Security on the Mainframe". Retrieved 2010-01-14. 
  8. ^ System p Virtualization
  9. ^ 207-269, IBM Announcement (2007-11-06). "IBM System p Virtualization — The most complete virtualization offering for UNIX and Linux". Retrieved 2010-04-06. 

External links[edit]

Wikipedia content is licensed under the GFDL License
Powered by YouTube
LEGAL
  • Mashpedia © 2014