I discovered a "gotcha" related to this thread a few days ago. We have 4
lpars sharing 3480's and 3590's. On my VM Test lpar, I run a couple of 2nd
level VM maintenance or installation guests. I discovered that if I attach
an address to a 2nd level VM guest, that ATTACH will turn on the assignment
bit. On the 2nd level guest, when I attach the tape address to an id. It
gets the address as expected. When the 2nd level MAINT id finishes with
the address and detaches it, that resets the assignment bit for that
address in the control unit, yet the VM Test lpar still thinks that the
address is attached to the 2nd level guest. It is, but the assignment bit
isn't set. It's like doing an ATTACH (NOASSIGN.
That's what I classify as another nick in the slide down the razor blade of
life.
Jim
At 01:06 PM 8/8/2006, you wrote:
It's not really a joke ...
To be clearer ... you want to issue a MIM GLOBAL VARY OFF so the drive
is set OFFLINE on *every* system ... then a MIM GLOBAL VARY ON. =20
The act of VARY OFF/ON will reset the ASSIGN bit on whichever system is
the offending one.
This doesn't tell you which system was the culprit ... it's the "sledge
hammer" approach to getting the problem corrected as quickly as
possible.
JR
JR (Steven) Imler
CA
Senior Software Engineer
Tel: +1 703 708 3479
Fax: +1 703 708 3267
[EMAIL PROTECTED]
=20
-----Original Message-----
From: The IBM z/VM Operating System [mailto:[EMAIL PROTECTED] On
Behalf Of Alan Ackerman
Sent: Tuesday, August 08, 2006 12:59 PM
To: IBMVM@LISTSERV.UARK.EDU
Subject: Re: Who has the tape drive ASSIGNed?
That's a joke, right? MIM thought the drive was free, or it would not
hav=3D
e=20
assigned it to VMDEV2.
Jim Bohnsack
Cornell Univ.
(607) 255-1760
