486 Introduction to the New Mainframe: z/VSE Basics
logical partitioning. A function of an operating
system that enables the creation of logical partitions.
logical record. A user record, normally pertaining to
a single subject and processed by data
management as a unit. Contrast with physical
record, which may be larger or smaller.
logical subsystem. The logical functions of a
storage controller that allow one or more host I/O
interfaces to access a set of devices. The controller
aggregates the devices according to the addressing
mechanisms of the associated I/O interfaces. One or
more logical subsystems exist on a storage
controller. In general, the controller associates a
given set of devices with only one logical subsystem.
logical unit ...