An IBM System 390 consists of hardware and software products. The hardware has a central processor complex (CPC) that includes the central processor, storage, channels etc. The Software consists of system application programs, end-user application tools etc. The primary program executing on the system is an operating system is an operating system such as OS/390.
The OS/390 operating system manages the instructions to be processed and the resources required to process them. A single copy of OS/390 running on a single processor system is called a uni-processor.
By adding more processors to a CPC, multiple program instructions can be processed simultaneously. A multiprocessor system running under a single OS/390 image is referred to as non-partitionable multiprocessor.
That PR/SM feature allows multiple logical partitions such as:
* processor
* storage
* channel paths
A symplex (Systems complex) consists of two or more MVS systems residing on one or more CPCs. It is the basis for a simplified multi-system management. In a sysplex, an installation can view multiple MVS systems as a single entity. The enhanced parallel-sysplex supports communication and data sharing among more systems, thus dynamically balancing workloads.
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