Spool records (and page records and warm start and checkpoint) are addressed
as CCPV:
CC - cylinder number on the volume (2 bytes)
P - page number within cylinder (1 byte)
V - volume number - index number into the CPOWN list (1 byte)
The last one is why you can't move a volume's position in the CPOWN list.
If you do, you invalidate the index number and make its contents
inaccessible.
Marty
____________________
Martin Zimelis
Principal
maz/Consultancy
> -----Original Message-----
> From: The IBM z/VM Operating System
> [mailto:[EMAIL PROTECTED] On Behalf Of Tom Duerbusch
> Sent: Wednesday, September 19, 2007 4:59 PM
> To: [email protected]
> Subject: Re: Extending the 5.3 install page and spool
>
> The question I was trying to bring up, as modified by your comments:
>
> "Spool files are addressed as volume_number, cyl, track, record."
>
> Is the "volume_number" always the cpowned number, or is it based on
> type, in this case "spool type"?
>
> Since we haven't come up with a definitive answer, and I guess you
> can't easily test this, then the SPXTAPE is the only way to
> be sure you
> don't loose your spool.
>
> BTW, I take it that you don't normally backup spool or this
> wouldn't be
> a problem at your installation.
>
> Tom Duerbusch
> THD Consulting
>
> FELINE PHYSICS:
> Law of Cat Motion
>
> A cat will move in a straight line, unless there is a really good
> reason to change direction.
>
>
> >>> Jim Bohnsack <[EMAIL PROTECTED]> 9/19/2007 3:04 PM >>>
> I can't really address Robert Nix's question. I'd be leery of trying
> it
> without doing a SPXTAPE dump, however.
>
> The question that Tom raised however referring to changing
> the order in
>
> the CP owned list of a spool volume cannot be done without dumping and
>
> reloading the spool. This is because each CP owned volume
> has a number
>
> in the CP owned list and if the "n'th" volume, which happens
> to contain
>
> SPOOL space all of a sudden becomes "n'th+1" volume, you've just lost
> what "was" on the volume.
>
> Spool files are addressed as volume_number, cyl, track, record.
>
> Jim
>
>
> Tom Duerbusch wrote:
> > The thing I would be concerned about, is changing the order of the
> > CPOWNED volumes.
> >
> > In this case, you are not.
> > But, is there some requirement of keeping the spool volumes in the
> same
> > order?
> > In other words, if PACK03 will now contain spool files, what would
> > happen if the cpowned list shows:
> > PACK01, PACK02, PACK03, PACK04, PACK05.
> > But your spool files were on:
> > PACK02, PACK04, PACK05.
> >
> > Would inserting the spool volume happen at the end of the
> spool list?
>
> > In middle of the spool list? Or who cares?
> >
> > And which would end up cold starting the spool areas?
> >
> > I think you have a right to be concerned. I would offload my spool
> > before doing such a thing. But I have good access to tape.
> >
> > Tom Duerbusch
> > THD Consulting
> >
> > FELINE PHYSICS:
> > Law of Cat Motion
> >
> > A cat will move in a straight line, unless there is a really good
> > reason to change direction.
> >
> >
> >
> >>>> RPN01 <[EMAIL PROTECTED]> 9/19/2007 1:29 PM >>>
> >>>>
> > I think I asked this once, but didn¹t get an answer....
> >
> > The 5.3 install allowed me to format page and spool as 3390 mod 9
> > devices
> > (10017 cylinders). But in fact, I was using 3390 mod 27 disks (32760
> > cylinders). If I go into the devices with ICKDSF and change the
> > remaining
> > cylinders to PAGE and SPOL, I¹m fairly sure nothing bad will happen
> to
> > the
> > page volume, but will the spool volume remain intact? Or will I be
> > cold-starting and rebuilding my SDF files?
> >
> > Do I need to back everything up (requiring tape, which is scarce
> here),
> > or
> > can I get away with just doing it?
> >
> >
>
>
> --
> Jim Bohnsack
> Cornell University
> (607) 255-1760
> [EMAIL PROTECTED]
>
