DPM provides Web-based user interfaces for many LPAR-related configuration and monitoring tasks. IBM introduced a related, simplified, optional feature called Dynamic Partition Manager (DPM) on its IBM z13 and first generation IBM LinuxONE machines. It is a standard feature on IBM Z and IBM LinuxONE machines. 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. 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. 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 PR/SM in 1988 with the IBM 3090 processors.

Similar facilities exist on the IBM Power Systems family, and its predecessors. PR/SM is integrated with all IBM System z machines. : 83 In mainframe computing PR/SM ( Processor Resource/System Manager) is a type-1 Hypervisor (a virtual machine monitor) that allows multiple logical partitions to share physical resources such as CPUs, I/O channels and LAN interfaces when sharing channels, the LPARs can share I/O devices such as direct access storage devices (DASD). Formally, LPAR designates the mode of operation or an individual logical partition, whereas PR/SM is the commercial designation of the feature.

PR/SM Īlthough the terms PR/SM and LPAR are often used interchangeably in IBM Z, including in IBM documentation, PR/SM was not present in the IBM System/370 Model 168's Virtual Machine Facility/370 it came in with the IBM 3090, years later. In effect, a physical machine can be partitioned into multiple logical partitions, each hosting a separate instance of an operating system. Subset of a computer's hardware resources, virtualized as a separate computerĪ logical partition ( LPAR) is a subset of a computer's hardware resources, virtualized as a separate computer.

Windows partition manager