Xen users - Oct 2008 - Shutdown of dom0 with running DomUs cannot deactivate volume group

Hi all,

I have a little server with some Debian DomUs that are automatically 
started at system boot. Each DomU uses LVM Volumes for root and swap 
area. When I now shutdown the whole machine using the shutdown -h 
command in the dom0 I always get an error message that LVM cannot be 
shutdown properly because there are still some active volumes. These are 
the volumes used by the domUs. When I manually shutdown the domUs using 
xm shutdown, I do not get the error message.

My question now is: is there something similar to the autostart of domUs 
for shutdown? Do I have to write a special script that calls "xm 
shutdown -a w"? If yes where do I have to place it.


Regards

    Martin

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On Mon, Oct 20, 2008 at 6:12 AM, Martin Lang <mlg-hessigheim@gmx.de>
wrote:
> Hi all,
>
> I have a little server with some Debian DomUs that are automatically
started
> at system boot. Each DomU uses LVM Volumes for root and swap area. When I
> now shutdown the whole machine using the shutdown -h command in the dom0 I
> always get an error message that LVM cannot be shutdown properly because
> there are still some active volumes. These are the volumes used by the
> domUs. When I manually shutdown the domUs using xm shutdown, I do not get
> the error message.
>
> My question now is: is there something similar to the autostart of domUs
for
> shutdown? Do I have to write a special script that calls "xm shutdown
-a w"?
> If yes where do I have to place it.
>
You should be able to use the domU config option:
on_xend_stop

cheers,
Todd


-- 
Todd Deshane
http://todddeshane.net
http://runningxen.com

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I put

on_xend_stop = "shutdown"

in my domU config files without any result. I still get the error 
message that lvm volumes are used and cannot be shutdown. Does setting 
on_xend_stop = "shutdown" wait until all domUs are shutdown, or does
the
normal shutdown process go on in parallel.

Todd Deshane wrote:
> On Mon, Oct 20, 2008 at 6:12 AM, Martin Lang <mlg-hessigheim@gmx.de>
wrote:
>   
>> Hi all,
>>
>> I have a little server with some Debian DomUs that are automatically
started
>> at system boot. Each DomU uses LVM Volumes for root and swap area. When
I
>> now shutdown the whole machine using the shutdown -h command in the
dom0 I
>> always get an error message that LVM cannot be shutdown properly
because
>> there are still some active volumes. These are the volumes used by the
>> domUs. When I manually shutdown the domUs using xm shutdown, I do not
get
>> the error message.
>>
>> My question now is: is there something similar to the autostart of
domUs for
>> shutdown? Do I have to write a special script that calls "xm
shutdown -a w"?
>> If yes where do I have to place it.
>>
>>     
>
> You should be able to use the domU config option:
> on_xend_stop
>
> cheers,
> Todd
>
>
>   

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On Fri, Oct 24, 2008 at 11:05 AM, Martin Lang <mlg-hessigheim@gmx.de>
wrote:
> I put
>
> on_xend_stop = "shutdown"
>
> in my domU config files without any result. I still get the error message
> that lvm volumes are used and cannot be shutdown. Does setting on_xend_stop
> = "shutdown" wait until all domUs are shutdown, or does the
normal shutdown
> process go on in parallel.
You just need to make sure that the xend script is finished before the
script that
is stopping the LVM volumes. Once you know the lvm script, you could put a
while loop in that script that watches for a xend process, and once xend is
down, then it should be fine to bring down the LVs. Does that make sense?

Cheers,
Todd

-- 
Todd Deshane
http://todddeshane.net
http://runningxen.com

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Doesn''t xenddomains do this during shutdown?  I mean, it should wait
so long and then forcefully terminate the domain if it won''t shut down.
The
time to wait prior to kill can be configured, but the forceful termination
as part of the xenddomains shutdown, or is xenddomains part of Fedora and
not native to xend?
	Dustin

-----Original Message-----
From: xen-users-bounces@lists.xensource.com
[mailto:xen-users-bounces@lists.xensource.com] On Behalf Of Todd Deshane
Sent: Friday, October 24, 2008 11:26
To: mlg-hessigheim@gmx.de
Cc: xen-users@lists.xensource.com
Subject: Re: [Xen-users] Shutdown of dom0 with running DomUs cannot
deactivate volume group

On Fri, Oct 24, 2008 at 11:05 AM, Martin Lang <mlg-hessigheim@gmx.de>
wrote:
> I put
>
> on_xend_stop = "shutdown"
>
> in my domU config files without any result. I still get the error message
> that lvm volumes are used and cannot be shutdown. Does setting
on_xend_stop
> = "shutdown" wait until all domUs are shutdown, or does the
normal
shutdown
> process go on in parallel.
You just need to make sure that the xend script is finished before the
script that
is stopping the LVM volumes. Once you know the lvm script, you could put a
while loop in that script that watches for a xend process, and once xend is
down, then it should be fine to bring down the LVs. Does that make sense?

Cheers,
Todd

-- 
Todd Deshane
http://todddeshane.net
http://runningxen.com

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On Fri, Oct 24, 2008 at 2:58 PM, Dustin Henning
<Dustin.Henning@prd-inc.com> wrote:
>        Doesn''t xenddomains do this during shutdown?  I mean, it
should wait
> so long and then forcefully terminate the domain if it won''t shut
down.  The
> time to wait prior to kill can be configured, but the forceful termination
> as part of the xenddomains shutdown, or is xenddomains part of Fedora and
> not native to xend?
The xendomains script is actually a good idea here and it comes standard
 with Xen.

The same basic idea should apply, but not tying the guest to xend has a lot
of advantages actually. For example when you just want to make a small
change and not bring all the guests down. Using the xendomains script
should be a better approach.

Cheers,
Todd

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