Description of IBM Enterprise Concepts

IBM Enterprise Concepts

Concept

Description

JES

JES manages the priority of the set of jobs and their associated input data and output results. The initiator uses the statements on the JCL,Job control language(language of z/OS) cards to specify the resources required of each individual job once it has been released (dispatched) by JES.

LPAR

A logical partition (LPAR) is the division of a computer's processor s, memory , and storageinto multiple sets of resources so that each set of resources can be operated independently with its own operating system instance and application s. The number of logical partitions that can be created depends on the system's processor model and resources available.

VTOC

z/OS® uses a catalog and a volume table of contents (VTOC) on each DASD to manage the storage and placement of data sets.

z/OS requires a particular format for disks, which is shown in Figure 1. Record 1 on the first track of the first cylinder provides the label for the disk. It contains the 6-character volume serial (volser) number and a pointer to the volume table of contents (VTOC), which can be located anywhere on the disk.

DASD

A direct-access storage device (DASD) pronounced /ˈdæzdiː/) is a secondary storage device in which "each physical record has a discrete location and a unique address."^[1]IBM developed DASDs for use with mainframe computers and some minicomputers. Disk drives, magnetic drums, data cells and optical disc drives are all classified as DASDs

Data Set

JCL

Sysplex

Catalog

CICS

REXX

ISPF

TSO

3270 Terminal