
Using Tape Processing
1-42 User Reference
Connectivity Systems, Inc.—Copyright © 2006
Use Pursuant to Company Instructions
BIM-EPIC Tape Processing
Using Tape Processing
Description Open processing, end-of-volume processing, and close processing are the
most significant BIM-EPIC processing periods. In each case, processing
is different for tape than for disk.
Open
Processing
Open processing is the most important processing period. When a tape
dataset is opened, BIM-EPIC carries out the following tasks:
BIM-EPIC checks the JCL and DSN Catalog to determine if the
dataset is tape or disk.
BIM-EPIC determines whether the dataset is controlled. If the
dataset is controlled, BIM-EPIC reads the catalog entry to
determine how to process the version. If the dataset is not
controlled, BIM-EPIC passes control to VSE immediately.
BIM-EPIC performs Automatic Volume Recognition (AVR)
processing by searching available drives for the correct input tape
or for a BIM-EPIC scratch tape for output.
If BIM-EPIC does not find an appropriate tape, BIM-EPIC issues
a message to the operator and waits for an operator response.
When the tape is found, BIM-EPIC assigns the drive to the
requesting partition. If Autoattach is active, BIM-EPIC attaches
the drive to the VSE Guest.
BIM-EPIC updates the DSN Catalog, creating a dataset definition
if automatic cataloging is required and records information about
the version being created. If OPEN is for Output, the version is
placed in open status.
BIM-EPIC updates the VSE Label Area. On input, BIM-EPIC
clears the dataset name from the label and substitutes the correct
volume serial number. On output, BIM-EPIC adds a period (.) in
the VOL1 Label Area to mark the tape as a BIM-EPIC tape.
BIM-EPIC then writes a 99365 expiration value in the HDR1
label to protect the tape against accidental overwrites.
BIM-EPIC passes control to VSE before the dataset is
written. VSE then uses the information in the VSE Label
Area to process the dataset.
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