The OAM CBRUXEJC exit is invoked when a requested tape is not found in the ATL. This provides you with 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, 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 1 or OAM are performed based on this exit. The only time to install and use this exit is to allow operations to insert a cartridge back into the IBM ATL and re-drive the allocation instead of simply allowing the job to have a JCL error or abend. If you have an IBM ATL with similar devices both inside and outside the robot (so any tape can be mounted either inside or outside the ATL) then there is no need to use this exit.
This exit must be customized for your environment. You must 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 IBM ATL and have only 3590 drives inside the IBM 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 IBM ATL are driven through the CBRUXVNL exit.
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