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Additional BIM-EPIC Features and Functions Managing Tape Devices
Chapter 1. Introduction 1-29
Managing Tape Devices
BIM-EPIC makes and releases drive assignments automatically with the Automatic Volume
Recognition (AVR), Autoattach, and Early Drive Release features. With these functions, tape
drives are assigned to a partition or virtual machine only between open and close. They aren’t
tied up between job start and open time or between close time and EOJ, so tape drive
availability is increased.
Tape drive assignments are affected by the SHARE and AUTOATT configuration options.
Early Drive Release is activated for uncontrolled tapes if the configuration option
UNCTAP=YES is specified.
BIM-EPIC does Automatic Volume Recognition (AVR) processing for both tape and disk.
When necessary, it searches available drives for the correct volume and assign that drive to the
partition running the job.
A tape drive is considered available for output if it:
contains a valid tape, that is, the tape volume serial number is in the DSN Catalog in
scratch status, or it has been initialized by DITTO
is ready and at load point
supports the mode setting selected for the dataset
is not in “device down” status
is not assigned to any partition
is not attached to any VM machine if Autoattach is on, or is attached to your machine if
Autoattach is off
When AVR finds the tape, BIM-EPIC assigns the drive to the partition running the job. To
function at its best, AVR requires you to delete your ASSGN statements from your JCL. For
more information about assignments and JCL, please see “ASSGN Statements and LUB
Allocation”.
If AVR cannot find an appropriate tape, BIM-EPIC pauses the partition and waits for the
interval specified by the AUTOSTP configuration option, then AVR scans the drives again.
This process repeats at the interval specified by the AUTOSTP configuration option. If AVR
still cannot find the appropriate tape after this process has completed, then it sends a mount
message to the operator and puts the partition in a wait state until the operator responds.
Autoattach attaches tape drives to virtual machines. Autoattach works with AVR to attach a
tape drive to the virtual machine while AVR assigns it to the partition.
Autoattach adds two new commands to VM: VATTACH and VDETACH. VATTACH
corresponds to the IBM ATTACH command. VDETACH corresponds to the IBM DETACH
command.
Drive Assignments
Automatic Volume
Recognition
Auto Stop
Autoattach
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