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Defining the BIM-EPIC Resource Dataset (ERD) Introduction
Chapter 2. Installing the Basic System 2-25
Defining the BIM-EPIC Resource Dataset (ERD)
Introduction
An ERD file is required when utilizing an ACL or for sharing tape devices among multiple
VSE machines (physical or virtual).
When utilizing ACL’s or sharing tape device among multiple VSE machines (physical or
virtual), a Unit Control Block (UCB) must be created for each tape device (reel or cartridge
type) that is accessible by BIM-EPIC. UCBs contain device number and attribute information
that BIM-EPIC needs for device allocation and deallocation. They are located in the BIM-
EPIC Resource Dataset (ERD).
An ERD should not be defined for a single-image system without an ACL device.
The ERD provides a single repository of tape characteristics and ownership information. Only
one ERD is used in a tape-sharing environment. For example, if CPU A, CPU B, and CPU C
are sharing a group of tape devices, only one ERD needs to be created. BIM-EPIC programs
running on these CPUs will all use this ERD.
The file can reside on CKD or FBA devices. The size requirements for the ERD are:
Device Type Size
FBA 224 blocks
CKD 7 tracks
The ERDFILE configuration option must be used to identify the DTF name for the ERD.
The ERD is formatted and maintained using the TSIDSMNT program.
Description
Space
Requirements
Configuration
Options
Formatting the
ERD
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