> -----Original Message-----
> From: IBM Mainframe Discussion List On Behalf Of Hank Oerlemans
> 
> The behavior can be demonstrated with the PDS utility and leaving off the SHR 
> parameter when
> specifying COMPRESS.
> 
> 
> Don't blame ISPF. The critical thing is DISP=OLD allocation occurring
> after a DISP=SHR.

Right; that part we understand.  We've also learned from our scheduler vendor 
that it attempts to obtain exclusive control of the library MEMBER, rather than 
the whole library, at job submission time.  We're still trying to figure out 
how one user was able to allocate that library with DISP=OLD.  Never observed 
here before; might never happen again.

    -jc-

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