>  If:   DMSSTT253E WHEN TRYING TO USE PERFKIT BATCH ON LARGE FILES happened to be the result of trying to read the file, then APAR VM63609  (PTF  
>  UM31452) should address it.  If that does not help, please open a PMR and we'll go from there.  Thanks, 
 
Nope, no error -- it's just that I need to use files that are larger than a single disk or tape volume can hold. With PRF, I could use concatenated FILEDEFs to stack input files; can't do that with CMS file I/O. Ditto with using tape as input -- PerfKit doesn't seem to allow for multivolume datasets as input (not that I'm a huge fan of OS sim, but this is one case where it came in very handy).
 
I'll have the customer call in the PMR and see what can be done.  

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