June 2003
Intermediate to advanced
464 pages
10h 33m
English
Once VM was generally available in 1972, some companies used it to partition machines in order to run different workloads in different partitions. It turned out that for some companies, a simpler partitioning scheme would be just as useful. As a result, some fundamental virtualization concepts were included into the architecture. These concepts became the hardware hypervisor Processor Resource/Systems Manager (PR/SM) and the logical partitions (LPARs) into which PR/SM could divide a machine. A zSeries 900 or 800 mainframe can run in one of two modes: basic mode or LPAR mode. In basic mode, the entire machine is under the control of a single operating system. In LPAR mode, you can logically divide the machine ...