If the VTOC is in the wrong place, I wonder what is wrong with the rest
of the disk. That sounds like it was formatted for OS or VSE. I don't
know if there is any value in locating the VTOC in the middle for those
systems any more. That was done to help lessen the seek time back in the
day when a disk was a coherent unit instead of a collection of scattered
sectors.
If you ipl to free this disk, you can include it as a drained device in
your system config. Then you can fix or replace it and add it back in
the configuration via commands. Do not forget to take it out of the
drained devices list.
Regards,
Richard Schuh
________________________________
From: The IBM z/VM Operating System
[mailto:[EMAIL PROTECTED] On Behalf Of Howard Rifkind
Sent: Wednesday, November 05, 2008 2:35 PM
To: [email protected]
Subject: Re: Removing a Paging Volume
Thanks all for the info, much appreciated.
>>> Alan Altmark <[EMAIL PROTECTED]> 11/5/2008 4:39 PM >>>
On Wednesday, 11/05/2008 at 04:04 EST, Bob Bates
<[EMAIL PROTECTED]> wrote:
> Well you can drain (CP DRAIN DASD rdev PAGE) it, but it might
never
come
> completely clean. And since it is running at 71%, I'd wonder
about the
ability
> of the other pack(s) to take up its load. You might want to
consider
adding
> some more page packs to the system if you can.
>
> Why is there a VTOC on a paging volume?
There's always a VTOC - it tell other systems that the disk has
no
available extents for allocation. I'm trying to figure out how
the VTOC
got somewhere other than cyl 0! If it's laying in the middle of
the pack
somewhere (result of mdisk) and that record isn't formatted as a
4K record
(labels are 80 bytes), there's going to be trouble if CP chooses
that
record to page to! Though thinking about it some more, I think
CP will
simply mark that record as "in error" and skip it.
Alan Altmark
z/VM Development
IBM Endicott
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