(1) The process of forming multiple physical partitions from one processor complex.
(2) Dividing the resources in a tape library (tape drives and tape volumes) among multiple systems, sysplexes, or both, for their exclusive use. Each partition can be viewed as a logical library with each logical library (TCDBplex) represented by one tape configuration database (TCDB).
(3) The division of a machine's computing resources into independent subsystems with processor, memory, and I/O resources dedicated to the exclusive use of a subsystem. This division allows multiple operating systems to run concurrently in the subsystems.