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LPAR
(redirected from Logical partition)

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LPAR
(Logical PARtition) A logical segmentation of a mainframe's memory and other resources that allows it to run its own copy of the operating system and associated applications. LPARs are caused by special hardware circuits and allow multiple system images to run in one machine. This can be multiple instances of the same operating system or different operating systems. In the IBM world, this is known as a "virtualized processor complex."

IBM's PR/SM ("prism"), Hitachi's MLPF and Amdahl's MDF are examples of LPARs. MDF was the first to provide in hardware the equivalent of IBM's VM operating system, which supports multiple system images in software. Interestingly, an LPAR can host VM, which itself can host multiple operating systems. See PR/SM and virtual machine.
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Most of the computer users create two or more logical partitions to distinguish and store their data in their hard drive.
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Virtual server technology has been a feature of IT systems for a very long time, having started in the mainframe datacenter as a way to create logical partitions within a large computing resource so that each partition could run a specific workload without interfering with the others.
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