Many years ago, when I allocated cyl 0 as "page"
(on a real paging "drum" with fixed heads)
it caused an I/O error but no problems
(CP just saved the page to another slot)
but at the next IPL the VTOC & dummy DSCB
were lost and the pack had to be reformatted
at each IPL before it would mount.
----- Original Message -----
From: "Alan Altmark" <[EMAIL PROTECTED]>
To: <LINUX-390@VM.MARIST.EDU>
Sent: Wednesday, January 23, 2008 2:44 PM
Subject: Re: z/VM 5.2 Absurd System shutdown - PJBR
On Wednesday, 01/23/2008 at 11:14 EST, Coffin Michael C
<[EMAIL PROTECTED]> wrote:
I'm a bit late in responding to this, but 2D5 (520PG1) has PAGE
allocated on
cylinder 0. You need to change this extent to start on cylinder 1, not
0 (0
contains the VTOC and has to be allocated as PERM). Update your SYSTEM
CONFIG
(MAINT CF1) and run ICKDSF on the pack to make sure 0 is allocated as
PERM (you
probably ought to reformat cylinder 0 while you are in there, who knows
what CP
might have been written on cylinder 0 that corrupted the VTOC).
Technically, it is ok to mark cyl 0 as PAGE. The paging subsystem knows
to avoid the tracks that have "important stuff" on them.
Administratively, I wouldn't. It's just too confusing.
Alan Altmark
z/VM Development
IBM Endicott
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