CA Dynam for VSE User Guide

Automatic Volume Assignment and Recognition (AVR)
Automatic Volume Assignment and Recognition (AVR)
Using AVR Processing
The Automatic Volume Recognition (AVR) facility of CA Dynam/D makes logical
unit assignments by analyzing the volume serial number of the EXTENT
statement for a given SYS number. In this way, an ASSGN statement is not
needed and the user need not know the physical device address in advance.
You can regulate the scope of AVR by specifying the following parameters in
the DYNAM/D option record:
• To provide AVR for all files, specify AVR(ALL).
• To provide AVR for CA Dynam/D-controlled files only, specify
AVR(DYNAMIC).
Whenever there is a missing ASSGN statement for a given logical unit, CA
Dynam/D (at OPEN time) automatically searches for a volume serial number
which matches the serial number requested. When a match is encountered, a
temporary assignment is made to the appropriate device address. In the event
that a matching serial number cannot be found, a mount message requiring a
response appears on the console.
However, if you included an ASSGN specifying the wrong device, CA Dynam/D
AVR will either correct the assignment or choose another LUB with which to
make the assignment.
At the end of the job, the AVR assignment is cleared.
Bypassing AVR Processing
You can temporarily bypass CA Dynam AVR processing by specifying option B
on the DLBL statement, for example:
// DLBL DISKOUT,'FILE.OUT(B)'
Note: Programs such as IBM Sort/Merge and the IBM compilers check the
device type assigned to each file before opening any files. Therefore, these
files should be assigned to some DASD device. Thus, at OPEN, CA Dynam/D
AVR will change the assignments to the correct DASD devices.
The assignment should be to a device of the same type as one of the devices
to which CA Dynam/D will change the assignment, because the device type is
determined prior to OPEN, in mixed DASD installations.
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