Thank all of you for your input. I have tested the "CP SIGNAL SHUTDOWN
guest WITHIN xx" and it does exactly what I want. I am writing an exec
to shutdown each guest individually and in phases. I think that I have
run into a problem in the past due to the fact that twenty minutes is in
sufficent. I currently have about 35 linux guests on this lpar. Two are
very large Oracle databases (20tb and 40tb). I intend to stagger the
shutdown over perhaps a 45min-1 hour timeframe. I will be testing this
out this weekend, since I am upgrading the lpar from 5.3 to 5.4.
Thanks, Bob
-----Original Message-----
From: The IBM z/VM Operating System [mailto:ib...@listserv.uark.edu] On
Behalf Of Martin, Terry R. (CMS/CTR) (CTR)
Sent: Wednesday, June 03, 2009 8:12 PM
To: IBMVM@LISTSERV.UARK.EDU
Subject: Re: Clean Linux Guest Shutdown
I have also written a shutdown exec to cleanly shutdown all of my
z/Linux guests and log them off once they are logged off a send a
message to the console stating this. This works well and I have not had
any problems.
The one thing I would mention is that we have some large Oracle guests
with large (5TB) data bases. To ensure that the Oracle shutdown script
has time to complete cleanly I make sure that my time out value is very
large at least 30 minutes. Now it normally does not take nearly that
long but if you add in the possibility of paging as Rob mentioned you
could be pushing the envelope and if the Oracle shutdown scripts do not
complete cleanly you run the very real risk of corrupting ASM and
believe me that is no fun. I have been there!
So if you are running these types of workloads make sure you give the
shutdown process plenty of time to complete cleanly.
Thank You,
Terry Martin
Lockheed Martin - Information Technology z/OS & z/VM Systems -
Performance and Tuning Cell - 443 632-4191 Work - 410 786-0386
terry.mar...@cms.hhs.gov -----Original Message-----
From: The IBM z/VM Operating System [mailto:ib...@listserv.uark.edu] On
Behalf Of Schuh, Richard
Sent: Wednesday, June 03, 2009 5:54 PM
To: IBMVM@LISTSERV.UARK.EDU
Subject: Re: Clean Linux Guest Shutdown
That makes sense ... if it doesn't just seem longer (remember, pacing
takes time, too - it is just spent waiting idly instead of waiting for
the work to be done) and paging during SHUTDOWN is something you really
have to worry about.
Regards,
Richard Schuh
> -----Original Message-----
> From: The IBM z/VM Operating System
> [mailto:ib...@listserv.uark.edu] On Behalf Of Rob van der Heij
> Sent: Wednesday, June 03, 2009 2:21 PM
> To: IBMVM@LISTSERV.UARK.EDU
> Subject: Re: Clean Linux Guest Shutdown
>
> On Wed, Jun 3, 2009 at 8:00 PM, Schuh, Richard <rsc...@visa.com>
> wrote:
>
> > Why not CP SIGNAL SHUTDOWN ALL instead of the table.
>
> From the peanut - uh performance gallery... If you have a lot of
> Linux servers, the orderly shutdown may actually take quite some
> paging resources to complete. When the shutdown is making them all do
> this at once, it may take much longer than when you pace it a bit.
> Seen with those who set LDUBUFF wrong.
>
> Rob
> --
> Rob van der Heij
> Velocity Software
> http://www.velocitysoftware.com/
>
