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CA Dynam for VSE User Guide

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IBM Virtual Tape Facility (VTAPE) Support<br />

<strong>CA</strong> <strong>Dynam</strong>/T Enhanced Support <strong>for</strong> Virtual Tapes<br />

<strong>CA</strong> <strong>Dynam</strong>/T automatically mounts both input and output virtual tapes.<br />

Currently IBM’s VTAPE and Fundamental Software’s FakeTape virtual tapes are<br />

supported. <strong>CA</strong> <strong>Dynam</strong>/T VTAPE support requires z/<strong>VSE</strong> 3.1 or higher. The<br />

FakeTape support requires both <strong>CA</strong> <strong>Dynam</strong>/T and FakeTape to be running on a<br />

Flex-ES system.<br />

If a <strong>CA</strong> <strong>Dynam</strong>/T controlled data set is written to a VTAPE, <strong>CA</strong> <strong>Dynam</strong>/T<br />

automatically issues the required VTAPE START command when the file is<br />

opened and issues a VTAPE STOP command when the file is closed. If the<br />

data set is written to a FakeTape, <strong>CA</strong> <strong>Dynam</strong>/T issues a special mount CCW<br />

that invokes FakeTape to mount the requested tape.<br />

Define Virtual CUUs<br />

To use the automatic virtual tape support, a list of virtual CUUs must be<br />

defined to <strong>CA</strong> <strong>Dynam</strong>/T <strong>for</strong> use when mounting virtual volumes. The system<br />

option record DTVIRT was created <strong>for</strong> this purpose. It can be defined and<br />

maintained online using CUI, or in batch using program <strong>CA</strong>CCDBU0. The CUUs<br />

defined must be added as cartridge devices in the <strong>VSE</strong> IPL procedures.<br />

An example ADD statement would be: ADD <strong>CA</strong>2:<strong>CA</strong>4,3480<br />

The CUUs must be in a DVCUP status. No real devices can use any of the<br />

defined virtual CUU addresses.<br />

Define Default File Name and Location<br />

A default VTAPE file name and location also can be defined in the DTVIRT<br />

system option record. This default is the file name and location passed on the<br />

VTAPE START command if no virtual tape in<strong>for</strong>mation is defined <strong>for</strong> the<br />

selected virtual scratch tape. For instructions on defining virtual scratch tapes,<br />

see the DYN<strong>CA</strong>T SCRPOOL command.<br />

A default FakeTape file name also can be defined in the DTVIRT option record.<br />

All VTAPE and FakeTape file names must contain the volser somewhere within<br />

the file name, thus ensuring all virtual file names are unique. The default<br />

VTAPE/FakeTape file name must contain the literal VOLSER. When using the<br />

default file name, <strong>CA</strong> <strong>Dynam</strong>/T substitutes the actual volser in place of the<br />

literal VOLSER. For example, if the default file name chosen is<br />

<strong>CA</strong> DYNAM/T.VOLSER, when volume <strong>CA</strong>0001 is written <strong>for</strong> output, and no<br />

overriding file name is defined <strong>for</strong> the volume, the file name passed on the<br />

VTAPE START command or in the FakeTape CCW would be<br />

<strong>CA</strong> DYNAM/T.<strong>CA</strong>0001.<br />

Chapter 3: Supporting Tape File Management 3–57

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