The following scenario:
VTS shared among several z/OS monoplex systems. Each system has it's own set of tape categories in DEVSUPxx.
I had to read multiple tape volumes from other system.
So I temporarily added the volumes to the VOLCAT, disabled "REJECT ANYUSE(*)" in EDGRMMxx and I read the tapes successfully.

However I noticed every tape volume I read was automatically added to RMM database, which I don't want.
Q: How to prevent it?

The only method I'm aware now is to stop RMM and reset the subsystem, but it is not good idea, because some other users should be able to access the tapes under RMM control.

BTW: a tape must be read to be added to RMM db. I did not read few tapes previously added to the VOLCAT and those tapes were not added to RMM.

BTW2: I deleted the volumes automatically added to RMM.


--
Radoslaw Skorupka
Lodz, Poland

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