Xen users - Nov 2010 - Host machine shuts down instead of rebooting

Hi all

I recenty bought a dedicated server with the intention of configuring
Xen on it. However, I''ve run into a _really_ strange issue:

Whenever i reboot (run reboot or shutdown -r now) the physical host
it shuts down (powers off) instead.

The problems only seems to occur if I actually start a virtual machine.
If I simply reboot the physical machine without starting xend or any
virtual machines it will reboot fine.

So in summary
The following works:

Start physical machine -> reboot physical machine

Result: physical host reboots without a problem


The following doesn''t work:

Start physical machine -> reboot -> start xend + virtual machine ->
reboot physical machine

Result: physical host shuts down


I''m using Gentoo with Xen version 4.0.1. I''ve tried using both
Xenlinux
2.6.34-r4 and pvops kernel version 2.6.23.25 on the dom0. They both produce
similar results.

The physical machine is a Core i7 930 with an Intel x58 chipset. The VT
extension is enabled, VT-d is disabled.

Debugging the issue is made more difficult by the fact that I don''t
have
physical access to the host machine so I have to trouble an on site
technician every time it needs to be started again.

I''ve done several Xen setups in the past without running into severe
issues like this and i have no clue as to why this is happening. I 
don''t even know where to begin looking.

Any ideas or pointers are highly appreciated.

Kind regards.

Truls Asheim



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On Fri, 5 Nov 2010, Truls Asheim wrote:
> Whenever i reboot (run reboot or shutdown -r now) the physical host
> it shuts down (powers off) instead.
Hey, I have got a Dell PE2900 that always reboots when I shut it down :) I 
have several other ostensibly identical PE2900''s that shut down and
stay
down.

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Forgot to Cc the list :)

On 05/11/10 22:27, Truls Asheim wrote:
> On 05/11/10 17:10, Steve Thompson wrote:
> > On Fri, 5 Nov 2010, Truls Asheim wrote:
> > 
> > > Whenever i reboot (run reboot or shutdown -r now) the physical
host
> > > it shuts down (powers off) instead.
> > 
> > Hey, I have got a Dell PE2900 that always reboots when I shut it down
:) I
> > have several other ostensibly identical PE2900''s that shut
down and
> > stay down.
> 
> It seems like you are experiencing the oppistite of what I am.
> However, the root cause might be the same.
> 
> Have you ever gotten close to identifying the cause? Is the BIOS
> configuration of your machines also identical?
> 
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