CA Dynam for VSE User Guide

Tape Drives
LABELMSG=
Determines whether the CADC950I message will appear for TLBL statements
containing CA Dynam option codes. This message displays the original file ID
information before processing options are removed by the CA Dynam common
Job Exit.
The CADC950I message will appear on SYSLST if '// OPTION LOG' is coded, on
SYSLOG if LOG is coded and on both SYSLST and SYSLOG if both options are
coded.
Note: The SET LABELMSG command affects all partitions.
Tape Drives
Pooling Tape Drives (DTPOOL Option Record)
The DTPOOL option record provides tape drive pooling support for CA
Dynam/T. The available tape drives are defined into pools for the installation
as a whole, by both the CPU ID and the partition, or by either the CPU ID or
the partition. When CA Dynam/T AVR is attempting to locate a tape, only the
drives in the pool are searched (in the desired order). If there is no DTPOOL
option record, AVR searches all available drives in the order in which they
were defined in the PUB table by ADD statements at IPL. You can thus exclude
certain tape units from AVR, such as dummy tape units or tape units with
limited speed or mode capability.
Tape drive pooling also facilitates the mounting of tapes because you can
change the sequence in which tapes are searched for. For instance, you can
search the drives nearest the tape library first.
Note that DTPOOL only affects CA Dynam/T during AVR scans; you can select
any drive defined in the PUB table in a cuu response to the MOUNT message.
For more information, see the DTPOOL option record in the Programming
Guide.
Locking Tape Drives (DTLOCK Option Record)
A multi-CPU installation that is sharing tape drives can use tape drive locking
(DTLOCK) if both of the following conditions are satisfied:
• AVRLCK(YES) is specified in the DYNAM/T option record.
• The DTLOCK option record is coded to define a common LOCK name which
can be referenced by all CPUs for a specific tape unit.
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