Memorex LOCK - VERSION 2-24 Informações Técnicas descarregar pdf (Página 351)

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Copying and Merging Datasets (TSIDDTD)

User Reference

Use Pursuant to Company Instructions

8-13

Tape Formats

Supported

Because TSIDDTD uses standard LIOCS access methods, TSIDDTD can

only process tapes which follow standard LIOCS format conventions.

For a labeled tape, the format is:

VOL and HDR labels, tapemark, data, tapemark, EOV or EOF

labels, tapemark[tapemark]

An unlabeled tape, the format is:

[tapemark], data, tapemark

Some utility programs, which appear to use LIOCS when writing

standard label tapes, actually use PIOCS and imbed additional tape marks

in the data area. Utilities known to imbed additional tape marks are

IDCAMS BACKUP and LIBR BACKUP. There may be others. When

LIOCS encounters one of these additional tape marks on input, it issues

the message “4130D EOF OR EOV INQUIRY?” because no EOV/EOF

label was found immediately following that tape mark. Therefore, if the

4130D message occurs while copying a file, the message indicates that

the tape format does not follow standard LIOCS conventions and cannot

be copied successfully using TSIDDTD.

Unfortunately, there is no method currently available to copy tapes which

use non-standard formats. Using DITTO is not recommended because it

will result in two or more volumes that have the same volume serial

number. The best solution is to execute the program which created the

original volume(s) a second time to create a second version.

Control

Statements

Control statements are used to define dataset characteristics and to specify

TSIDDTD processing options.

For controlled datasets, control statements are not necessary under normal

conditions. TSIDDTD will get the record type, record size, and block size

from the version record in the DSN Catalog.

For uncontrolled and Start Track 1 datasets, control statements specifying

the record type, record size, and block size are required.

The TSIDDTD maximum block size for tape is 32K on VSE releases

prior to ESA 2.5 and 64K for ESA 2.5 and above. A block size greater

than 32K is supported for disk. For uncontrolled labeled input tapes,

TSIDDTD uses HDR2 information. If record type, record size, and block

size are not specified and cannot be obtained from the DSN Catalog,

TSIDDTD defaults to an undefined record format with a block size of

32767. Record type, record size, and block size may not be in the catalog

for some controlled datasets that were created by programs that use

PIOCS.

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