On Monday, 01/26/2009 at 07:41 EST, Tony Thigpen <[email protected]> wrote: > On a CPVOL, what is stored in the VTOC address field +x'0B'? > > The question started on VSE-L due to a "what's on this volume" question. > The ownerid is CP370. The VTOC address field is there but is past the > end of the volume.
I meant to say, too, that CPVOLs do include a VTOC pointed to by VOL1(+11) as it is a required element of a VOL1 label. - The VTOC is non-indexed - The first free extent begins on track 1 and extends to the end of the volume - There are no unused cylinders in the extent - There are no unused tracks in the extent Those last two items are what tell MVS and VSE to not allocate datasets on the volume. "KEEP OFF." The VTOC you're seeing could have been the result of a DDR of a larger disk to a smaller one. DDR does not rewrite the VTOC (but DSF can). Alan Altmark z/VM Development IBM Endicott
