Memorex LOCK - VERSION 2-24 Informacje Techniczne Pobierz pdf (Strona 428)

Managing Tape Volumes

12-4 User Reference

Use Pursuant to Company Instructions

Small tapes are distinguished by their volume serial numbers which must

end with the character S. Large tapes have no restrictions to their volume

serial numbers. You can designate that a dataset should be written to

small tapes with online or manual catalog maintenance using the Tape

Size field.

Revolving Tape

Datasets

In some cases, you may want to use a specific set of tapes for a dataset to

ensure all versions of that dataset are contained on that specific set of

tapes only. This grouping is referred to as a revolving tape dataset.

The TSIDMNT CATALOG function or Online Manager CATALOG

function contains the parameter REV that allows you to define revolving

datasets.

Specifying REV=YES for a dataset establishes an exclusive relationship

between the dataset and the tapes used by the dataset. A revolving tape

can be used only to write its own dataset. A revolving tape dataset can be

written only on its own tapes.

If the dataset is new or does not have enough volumes in its revolving set,

you can use the Online Manager or TSIDMNT ADD function to add new

tapes and then use SCRATCH to scratch the tapes. These volume serial

numbers are now part of the datasets revolving set. Revolving tape

datasets cannot be used for ACL-resident tapes.

Multi-Dataset/

Multi-Volume

Processing

BIM-EPIC supports multi-dataset, multi-volume, and

multi-dataset/multi-volume processing. A tape volume that contains a

dataset that is a member of a multi-dataset group cannot be scratched until

all datasets in the group have been scratched.

Work Tape

Datasets

A work tape dataset has been cataloged with the attribute WRK=YES or

defined with DISP=(NEW,DELETE) on a DD statement. A work tape

dataset can be written on any available scratch tape. The data on a work

tape is not usually saved after the end of the job in which the tape was

created. Under normal conditions, there is no need to place an external

dataset label on a work tape. For this reason, the EP005 message,

**LABEL**, is not issued for work tapes unless configuration option

EPS043=YES is used.

Assigning Tape

Drives

BIM-EPIC uses Automatic Volume Recognition (AVR) to automatically

search available tape drives for a required output or input tape volume

whenever a program issues an OPEN request. When AVR locates the

required volume, BIM-EPIC makes the necessary VSE assignment. When

the program issues a CLOSE request, BIM-EPIC releases the assignment

and makes the drive available to other programs unless directed otherwise

by a parameter on the TLBL statement or DD statement.

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