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Introduction
12-2 User Reference
Introduction
Every tape volume used to write a BIM-EPIC-controlled dataset must have a unique volume
serial number. Even unlabeled tapes must be identified with their own volume serial numbers.
This strict identification is essential to tape volume control.
Volume serial numbers can be any six-character combination of alphanumeric characters.
Groups of volume serial numbers do not need to be consecutive; any unique volume serial
number is valid. Tape pools are defined within volume serial number ranges, so it can be
helpful to initialize pooled tapes with consecutive volume serial numbers.
When a tape volume is brought under BIM-EPIC control, BIM-EPIC gives it a special VOL1
label which identifies the volume as controlled and protects it against accidental overwrites.
BIM-EPIC looks for a controlled tape volume when it performs AVR processing. First, it
looks for the special VOL1 label. If it does not find that label, it checks the DSN Catalog to
see if the tape was created by CA-EPIC for CMS; if it was, the volume is accepted. If the
volume fails these tests, BIM-EPIC asks the operator to specify a tape drive and to verify the
volume serial number of the tape on that drive.
Unlabeled tapes do not have this special VOL1 label, so BIM-EPIC requires the operator to
specify the drive that contains the volume, and to verify the volume serial number every time
unlabeled processing is requested.
If an uncontrolled tape volume has a label that has expired, BIM-EPIC can use the tape, but
again the operator is asked to verify the volume serial number. If that volume serial number
duplicates one already in the DSN Catalog, the operator is asked to enter a new volume serial
number.
BIM-EPIC writes an expiration date of 99365 (permanent retention) on every HDR1 label
created under its control. This helps to protect the tape from being overwritten outside BIM-
EPIC's control (for example, when BIM-EPIC has not been started or has been deactivated).
BIM-EPIC uses the DSN Catalog, not the HDR1 label, to determine each tape volume's status
as active or scratch.
Scratch tapes are produced by the SCRATCH functions of TSIDUTL, TSIDMNT, and Online
Manager. The TSIDUTL "DSPLY SCRATCH" function produces a report listing all
available scratch tapes. The TSIDUTL "PSCRATCH" function creates a report projecting
which tapes will be eligible to be scratched on a certain date.
See the BIM-EPIC Installation and System Guide for information about TSIDUTL's JCL
requirements. Also see the TSIDMNT SCRATCH function.
Tape Volume Serial
Numbers
Recognizing and
Controlling Tape
Volumes
HDR1 Labels and
Retention
Scratch Tapes
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