CA Dynam for VSE User Guide

Using CA Dynam/T
An output tape file, ARMTAP, is to be created on SYS006, under the data set
name AR MSTR OUT. When the CADT008D MOUNT message is issued, STATUS
shows no tape drives available. The operator could reply STOP and allow the
job in F2 to complete; then, he could restart BG. Instead, he chooses to
respond DISK, requesting CA Dynam to change the device type from tape to
disk and use the disk allocation characteristics stored in the Catalog to control
the allocation of the file. CA Dynam/FI is invoked to modify the file type, and
CA Dynam/D to locate the space; the file is successfully created on DASD
volume SYSWK1.
Note that another logical unit is used by CA Dynam/D for the file. When the
file is called for as input, CA Dynam/FI intervenes to locate the file on disk and
allow it to be inputted from there automatically, even though JCL can call for
the file on tape.
In order for processing such as this to take place, all of the following must be
true:
• The complete CA Dynam system must be installed.
• FISWTCH must be active.
• The file must be defined in the Catalog as eligible for switching.
For more information, see Operator Device Switching Facility in the chapter
"Controlling File Independence."
Attention Routine (AR) Commands
Tape Drive Status and Control Commands
These commands can be issued from the operator console to position tapes or
display status without issuing DITTO or MTC commands.
DT BSF cuu,nnn
DT BSR cuu,nnn
DT FSF cuu,nnn
DT FSR cuu,nnn
Backspace a tape drive nnn files.
Backspace a tape drive nnn records.
Forward space a tape drive nnn files.
Forward space a tape drive nnn records.
DT LOCK cuu|TAPES nnn|ALL
Issue lock for specified tape drives.
DT READY cuu|ALL
DT REW cuu|ALL
Ready a tape that is left in NOT AVRABLE status.**
Rewind the named tape drives.
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