PR/SM

In mainframe computing a PR/SM (Processor Resource/System Manager) is a type-1 Hypervisor (a virtual machine) that allows multiple logical partitions to share physical resources such as CPUs, I/O channels and direct access storage devices (DASD). It is integrated with all IBM System z machines.

IBM introduced PR/SM in 1985 with the IBM 3090-E processors.

IBM developed the concept of hypervisors in their CP-40 and CP-67, and in 1972 provided it for the S/370 as Virtual Machine Facility/370. IBM introduced the Start Interpretive Execution (SIE) instruction as part of 370-XA on the 3081, and 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 LPAR's to share physical resources. It is a standard feature on IBM System z machines.

Read more about PR/SMReferences

Other related articles:


... Date Place Dist ... Winner Time Second Time Third Time November 10, 2006 Heerenveen, Netherlands 500 m Lee Sang-Hwa 38.23 Jenny Wolf 38.60 Wang Beixing 38.70 The opening race of the World Cup season was won by a 17-year-old Korean, her first win in an Olympic distance ...