Memorex LOCK - VERSION 2-24 Spezifikationen PDF herunterladen (Seite 187)

DD Statements for Tape and Disk Datasets What to do for Different Types of Datasets

Chapter 6. BIM-EPIC DD Statements 6-9

What to do for Different Types of Datasets

This section describes the particular DD parameters to use when you are processing different

kinds of datasets.

For tape processing, pay particular attention to the VOLUME, FREE, and DISP parameters.

VOLUME has several uses for tape. FREE holds and releases tape drive assignments.

DISP=(x,KEEP) unloads tapes at close.

By default a tape is rewound at close, but left mounted. If you specify DISP=(x,KEEP),

VOL=PRIVATE, or VOL=(,RETAIN) the rewind default is overridden.

For multi-dataset requirements, see "Multi-Dataset Processing,".

The SPACE parameter plays a particularly important role in disk processing. Use it to

determine the extent allocations for datasets not yet entered in the DSN Catalog. SPACE is

always required for Start Track 1 and uncontrolled datasets. Reuse the same extent with

DISP=MOD. UNIT is required for disk output.

If the dataset is already defined in the catalog, specify DISP=(x,KEEP) for both input and

output. You can override dataset defaults for the version by specifying the equivalent

parameter. For instance, you can override period retention by specifying LABEL=RETPD=n.

Otherwise, parameters do not have to be specified if that information is already in the dataset

definition. If you want to modify the current dataset definition, specifye DISP=(x,CATLG).

You must also set the JCLOVRDE configuration option to YES.

To autocatalog a new output dataset, specify DISP=(NEW,CATLG). It is cataloged using the

data in the DD statement. DD statement parameters cover most of the dataset definition, so

you can do a thorough job of defining the dataset in your JCL. You cannot use DD statements

to autocatalog an input dataset.

Please note: If a dataset qualifies for autocataloging according to the configuration options

you have specified, it will be cataloged automatically even if you don't specify

DISP=(x,CATLG). See "Automatic Cataloging" in Chapter 1 for more information on

autocataloging with configuration options. The recommended method is to use the

DISP=(x,CATLG) parameter to autocatalog all datasets defined with DD statements.

The following example shows a new, cataloged dataset. Its default block size is overridden:

its actual block size is 4080.

* //TAPEOUT DD DSN=SARS.BACKUP,DISP=(NEW,KEEP),

* // DCB=BLKSIZE=4080

Tape

Disk

Cataloged

Example

1 2 ... 182 183 184 185 186 187 188 189 190 191 192 ... 488 489

Keine Kommentare

Memorex LOCK - VERSION 2-24 Spezifikationen Seite 187