
Using BIM-EPIC's JCL Features Choosing the Device Type
Chapter 7. Running Jobs With BIM-EPIC 7-57
You can use GDI or GDIUR for uncontrolled and controlled datasets. A dataset normally
processed as a Start Track 1 disk dataset would become uncontrolled if processed on tape with
GDI.
GDIUR does not support RPG-II SYSLST processing.
GDIUR datasets cannot have secondary extents.
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.
Generic device independence is controlled by the configuration options GDI and GDIUR.
Device independence can be invoked in any of the following ways:
• In response to a message. An insufficient space message or a request for a scratch tape
can be answered with TAPE or DISK 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. The desired device type is indicated by your job control statements. For
example, use a TLBL instead of a 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 that the dataset is to be on disk instead of tape. (Both GDI and GDIUR)
Required information for tape and disk must be supplied in the dataset definition for
controlled datasets. This includes pooling and allocation information. If it is not included,
BIM-EPIC prompts the operator for the necessary input.
For uncontrolled tape or disk datasets, use the proper label (TLBL, DLBL, or a DD statement
with the UNIT parameter).
For controlled datasets, no JCL changes are required for input (GDI only). For output GDI,
and GDIUR input and output, invoke GDI by changing the label type (TLBL or DLBL) or
device type (UNIT=type). No volume or allocation information needs to be supplied in the
JCL.
When using GDIUR, it may be necessary to insert the OPTION=RESET parameter on the DD
statement after the step to terminate GDIUR processing if subsequent steps reference the same
system dataset DTF name and you don't need to control it further using GDIUR. See 6-27 in
this manual for more information.
Eligibility
Configuration
Options
Processing
DSN Catalog
JCL Requirements
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