The OAM CBRUXVNL exit is invoked when a requested tape is not found in the ATL, providing you an opportunity to insert the tape into the ATL and retry allocation without cancelling the job. Use of this exit is strictly optional. If you choose 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.
No updates to CA TLMS or OAM are performed based on this exit. The only time you would need to install and use this exit is if you wanted to allow operations the chance to insert a cartridge back into the 3494 and re-drive the allocation instead of simply allowing the job to have a JCL error or abend. If you have a 3494 ATL with similar devices both inside and outside the robot (so any tape can be mounted either inside or outside the 3494), then there is no need to use this exit.
This exit must be customized for your environment. You must determine what processing is to be done if the tape you are requesting is not in the library. For example, if you have 3490 drives outside the 3494 and have only 3590 drives inside the 3494, you would want to un-comment out two lines that compare the CA TLMS returned density with the value "3590." If you do not un-comment out these two line, then ALL allocations for the 3494 would be driven through the CBRUXVNL exit.
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