the pseries 655 model 651 (processor subsystem) is a processor node installed in a frame-mounted cage. the equipment rack holds a maximum of 16 processor subsystems.

1 frame cage (shown with two processor subsystems and front cover removed)
2 first pseries 655 processor subsystem
3 second pseries 655 processor subsystem
the hardware management console for pseries (hmc) is used to manage the resources in the system.
the system can be configured as a full system partition, which means that all resources of the system are used as a single system.
the system can also be configured into multiple (or logical) partitioned systems. with a logically partitioned system, system resources can be divided into a number of systems each running in its own partition. numerous configurations of pseries 655 systems can be managed from one hardware management console. a second hardware management console can be used for redundancy.