No, those DCB parameters are not supported.  I don't have immediate access
to the open processing at the moment, so I can't say how the error
condition would currently be handled.  I believe that the code that opens
SYSMDUMP uses a DCB with RECFM=FBS,LRECL=4160 supplied.  The DCB wins when
logical conflicts occur, so the DCB OPEN exit receives control with
BLKSIZE=3120 still incorrectly shown.  Then the DCB exit will either fix
the mismatched LRECL and BLKSIZE or will suffer an ABEND when OPEN is asked
to continue.  A successful repair of BLKSIZE would cause that data set to
be overwritten and DCB attributes set to RECFM=FBS, LRECL=4140, and
BLKSIZE=4160.

R.L. (Bob) Wright, z/OS MVS Service Aids, R4GA, 708-1F30, [EMAIL PROTECTED]
Robert Wright/Poughkeepsie/IBM @ IBMUS (notes to notes)
IBMUS(RLW) (host to notes), PLPSC.RLW (MVS) or S390VM.RLW (VM)

Jerry Ragland wrote on 10/24/2005 01:30:55:

> Is it possible to have a valid SYSMDUMP withe the following properties -
> RECFM=VB
> LRECL=139
> BLOCKSIZE=3120

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