Memorex LOCK - VERSION 2-24 Technical Information Seite 330

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Choosing the Device Type
7-62 User Reference
Connectivity Systems, Inc.—Copyright © 2006
Use Pursuant to Company Instructions
No ASSGN statement or CLOSE statement is needed. GDIUR ensures
that system logical units can never be left assigned to disk.
Programs that use GDIUR can also take advantage of the BIM-EPIC
reblocking facility to save disk space and improve performance.
Eligibility You can use GDI or GDIUR for uncontrolled and controlled datasets.
However, the following issues must be considered.
A dataset normally processed as a Start Track 1 disk dataset will
become uncontrolled if processed on a tape with GDI.
GDI applies to tape and disk sequential datasets DTFMT or
DTFSD. VSAM, direct access, and ISAM datasets are not
eligible.
GDI and GDIUR datasets must be processed with logical IOCS.
GDIUR does not support RPG-II SYSLST processing.
GDIUR datasets cannot have secondary extents.
Configuration
Options
The configuration options GDI and GDIUR control the generic device
independence.
Invoking Device
Independence
You can invoke device independence using any of the following methods:
In response to a message. A response of TAPE or DISK can be
used for an insufficient space message or a request for a scratch
tape to force the use of a different device type. (GDI only)
Automatically for input datasets. BIM-EPIC allocates the correct
device type when controlled datasets are processed as input. (GDI
only)
Using JCL. Your job control statements indicate the desired
device. For example, use TLBL instead of DLBL to specify that
the dataset is to be on tape instead of disk. On a DD statement,
specify UNIT=DISK instead of UNIT=TAPE to specify the
dataset is to be on disk instead of tape. (Both GDI and GDIUR)
DSN Catalog Required information for tape and disk must be supplied in the dataset
definition for controlled datasets. This includes pooling and allocation
information. If the required information is not included, BIM-EPIC
prompts the operator for the necessary input.
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