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Introduction
12-4 User Reference
If the dataset is new or it does not own enough tapes, new tapes can be added with the ADD
command and then scratched with the SCRATCH command (using Online Manager or the
TSIDMNT program).
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.
A work tape dataset is one that 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 it was created, so there is usually 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
special option EPS043=YES.
BIM-EPIC uses a process called Automatic Volume Recognition (AVR) to automatically
search available tape drives for a required tape volume whenever a program issues an OPEN
request. When AVR locates the required volume, BIM-EPIC makes the necessary
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 or DD statement.
It is the operator's job to ensure that tape drives are available to BIM-EPIC when it is
searching for a tape. A tape drive is available if it:
Contains a valid tape (the volume serial number is in the DSN Catalog, or the tape has
been initialized by the TSIDINIT or DITTO program)
Is not in the “device down” status
Is not attached to any virtual machine (if Autoattach is on), or is attached to the machine
running the job (if Autoattach is off)
Is not assigned to any partition
Is ready and at load point
Supports the mode setting selected for the dataset
Under most circumstances, you do not have to make drive assignments with the VSE ASSGN
statement. If Autoattach is on, you should avoid using the VM/CP ATTACH or DETACH
commands to control the tape drives. Instead, DETACH every tape drive and let BIM-EPIC
do the work for you.
If Autoattach is on and you do use the ATTACH command, remember to issue the VM/CP
DETACH command for the tape drive when you are finished, so that BIM-EPIC can use the
drive in another virtual machine.
BIM-EPIC only uses AVR for controlled tapes. If the required tape is not a BIM-EPIC-
controlled tape, the operator will be asked to specify the address of the tape drive to be used.
Multi-Dataset/Multi-
Volume Processing
Work Tapes
Assigning Tape
Drives
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