Dynamic Logical Partitioning

Dynamic Logical Partitioning (DLPAR), is the capability of a logical partition (LPAR) to be reconfigured dynamically, without having to shut down the operating system that runs in the LPAR. DLPAR enables memory, CPU capacity, and I/O interfaces to be moved nondisruptively between LPARs within the same server.

DLPAR has been supported by the operating systems AIX and i5/OS on almost all POWER4 and follow-on POWER systems since then. The Linux kernel for POWER also supported DLPAR, but its dynamic reconfiguration capabilities were limited to CPU capacity and PCI devices, but not memory. In October 2009, seven years after the AIX announcement of DLPAR of memory, CPU and IO slots, Linux finally added the capability to DLPAR memory on POWER systems. The fundamentals of DLPAR are described in the IBM Systems Journal paper titled: "Dynamic reconfiguration: Basic building blocks for autonomic computing on IBM pSeries Servers.

Later on, the POWER5 processor added enhanced DLPAR capabilities, including micro-partitioning: up to 10 LPARs can be configured per processor, with a single multiprocessor server supporting a maximum of 254 LPARs (and thus up to 254 independent operating system instances).

There are many interesting applications of DLPAR capabilities. Primarily, it is used to build agile infrastructures, or to automate hardware system resource allocation, planning, and provisioning. This in turn results in increased system utilization. For example, memory, processor or I/O slots can be added, removed or moved to another LPAR, without rebooting the operating system or the application running in an LPAR. IBM DB2 is such application (http://www.ibm.com/developerworks/eserver/articles/db2_dlpar.html), it is aware of the DLPAR events and automatically tunes itself to changing LPAR resources.

The System z9 and zSeries mainframes and their operating systems, including Linux on zSeries, support even more sophisticated forms of dynamic LPARs. Relevant LPAR-related features on those mainframe platforms include Intelligent Resource Director, Sysplex, Parallel Sysplex, Geographically Dispersed Parallel Sysplex, and Hipersockets. The System z9 supports up to 60 LPARs on a single server, but mainframes also support an additional level of virtualization using z/VM with the ability to support thousands of operating system instances on a single server.

See also

• Virtualization
  • OS-Level Virtualization
  • Hypervisor
  • Hipersockets
• Logical Partitioning
  • Micro-Partitioning

This operating system-related article is a stub. You can help Wikipedia by expanding it.v · Categories: AS/400 IBM storage devices Power Architecture Virtualization software IBM mainframe technology IBM Mainframe computer operating systems Operating system stubs Wikimedia Foundation. 2010. Игры ⚽ Поможем написать курсовую Hyundai FB Red flag (signal) Look at other dictionaries: Logical Disk Manager — The Logical Disk Manager (diskmgmt.msc) is an implementation of a logical volume manager for Microsoft Windows NT, developed by Microsoft and Veritas Software. It was introduced with the Windows 2000 operating system, and is supported in Windows… …   Wikipedia Micro-Partitioning — is a form of logical partitioning which was introduced by IBM on systems using the POWER5 processor, and is also referred to as a shared processor partition, and only differs from a dedicated processor partition in the way CPU utilization is… …   Wikipedia IBM BladeCenter — IBM BladeCenter  это архитектура блэйд серверов IBM. BladeCenter E front side: 8 blade servers (HS20) followed by 6 empty slots …   Википедия IBM BladeCenter — The IBM BladeCenter is IBM s blade server architecture.HistoryOriginally introduced in 2002, based on engineering work started in 1999, the IBM BladeCenter was a relative late comer to the blade market. But, it differed from prior offerings in… …   Wikipedia LPAR — In computing, 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 LPARs, each housing a separate operating… …   Wikipedia IBM System p — The System p, formerly known as RS/6000, was IBM s RISC/UNIX based server and workstation product line. In April 2008, IBM announced a rebranding of the System p and its unification with the System i platform. The resulting product line is called …   Wikipedia System p — линейка серверов и рабочих станций компании IBM, ранее известна как RS/6000. В Апреле 2008 года компания IBM заявила о слиянии платформ System p и System i. Объединенный продукт носит название IBM Power Systems. Содержание 1 История 2 Процессоры …   Википедия Workload Partitions — (WPARs) are a software implementation of operating system level virtualization technology introduced in the IBM s AIX 6.1 operating system that provides application environment isolation and resource control.WPARs are software partitions that are …   Wikipedia Linux on Power — Linux is a computer operating system that runs on Power Architecture technology, a microprocessor architecture. Introduction Linux on e Server p5 series, formerly called RS/6000 (for RISC System/6000 ), is a ppc64 Linux port running on IBM POWER… …   Wikipedia Windows Server 2008 — Part of the Microsoft Windows family …   Wikipedia 18+ © Academic, 2000-2024 Contact us: Technical Support, Advertising Dictionaries export, created on PHP, Joomla, Drupal, WordPress, MODx. Mark and share Search through all dictionaries Translate… Search Internet Share the article and excerpts Direct link … Do a right-click on the link above and select “Copy Link”