
Managing Tape Devices
User Reference
Connectivity Systems, Inc.—Copyright © 2006
Use Pursuant to Company Instructions
1-31
Managing Tape Devices
Drive
Assignments
BIM-EPIC makes and releases drive assignments automatically using the
Automatic Volume Recognition (AVR), Autoattach, and Early Drive
Release features. Using these features, tape drives are assigned to a
partition or virtual machine between open and close only. Performing the
assignments in this manner frees up the tape drives between job start and
open time or between close time and end-of-job, increasing the
availability of the tape drives.
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.
Automatic
Volume
Recognition
BIM-EPIC does AVR processing for both tape and disk. When necessary,
BIM-EPIC searches available drives for the correct volume and assigns
that drive to the partition running the job.
A tape drive is considered available for output if it:
Contains a valid tape with a tape volume serial number located 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 another LPAR or Guest Virtual Machine if
Autoattach is on or is attached to your LPAR or Guest Virtual
Machine if Autoattach is off
Note:Note:
When AVR finds the tape, BIM-EPIC assigns the drive to the partition
running the job. To maximize performance, you must remove ASSGN
statements from your JCL. See “
Using LUB Allocation and the ASSGN
Statement” for additional information on assignments and JCL.
Auto Stop While scanning the drive, if AVR cannot find an appropriate tape,
BIM-EPIC pauses the partition and waits for the interval specified by the
AUTOSTP configuration option and then rescans the drive. This process
is repeated at the interval specified by the AUTOSTP configuration
option. If AVR still cannot find the appropriate tape after this process has
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