The OAM CBRUXVNL exit is invoked when a requested tape is not found in the ATL, providing an opportunity to insert the tape into the ATL and retry allocation without canceling the job. Use of this exit is strictly optional. If you select to use this exit, you should be aware that OAM also calls this exit for DASD that is offline and for all tapes (even round reels) not in an SMS managed IBM robot.
There are no CA 1 OAM updates performed based on this exit.
This exit is only installed and used to allow operations an opportunity to insert a cartridge (or import a virtual volume) back into the ATL/VTS and re-drive the allocation rather than simply allowing a JCL error or abend to occur during the job. If you have a VTS without the IMPORT/EXPORT feature this exit is not necessary (all virtual volumes are always inside the robot.)
This exit must be customized for your environment. You must also determine what processing needs to be done if the tape you are requesting is not in the library. For example, if you have 3490 drives outside the ATL and have only 3590 drives inside the ATL, un-comment out two lines that compare the CA 1 returned density with the value "3590". If you do not un-comment out these two lines, then ALL allocations for the ATL are driven through the CBRUXVNL exit.
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