ariel.atom2 at web2web
Aug 7, 2013, 6:38 AM
Post #4 of 4
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Hi Ian,
many thanks for your suggestions and for helping out in trying to get to
the roots of this issue. Sorry for my delay in responding - setting up a
serial console took a bit of time, but please see my inline comments below.
Thanks.
Am 07.08.13 10:39, schrieb Ian Campbell:
> On Mon, 2013-07-29 at 00:03 +0200, Atom2 wrote:
>> Hi guys,
>> I have a problem with powering down my system under the XEN hypervisor.
>> System details are as follows:
>>
>> gentoo linux, X86_64
>> XEN version 4.2.2
>> linux hardened kernel 3.9.5 as dom0
>> Xeon E3 1260L processor (vt-d capable)
>> 32GB ECC RAM which has been thoroughly tested - so should be o.k.
>>
>> when I issue "shutdown -h now" from dom0 the system usually reboots
>> instead of turning off power to the machine. There's the odd occassion
>> (probably 1 in every 10 to 20 shutdown attempts) when the system power
>> is actually turned off. There seems to be no rule to follow when this
>> happens.
>>
>> If I use the exact same kernel and start w/o the XEN hypervisor
>> powerdown *always* works as expected when I use "shutdown -h now". So on
>> the face of it, this seems to point to the XEN hypervisor as the culprit.
>>
>> Any idea/help on how to track down and solve the issue would be very
>> much appreciated. If you require any more information / log data, I'm
>> more than happy to provide that.
>
> You could try the Xen reboot= option, which controls which hardware
> mechanism tries to use to reboot. See
> http://xenbits.xen.org/docs/unstable/misc/xen-command-line.html for
> details.
>
None of the options listed in your link (reboot=b|t|k|n|w|c) managed to
turn off power to the system. All but reboot=n (and also noreboot=true)
did a reboot after requesting a powerdown with shutdown -h now.
reboot=n or noreboot=true just left the machine's power on with the last
message on the console (from the gentoo dom0 shutdown) reading
[ <no secs since start> ] Power Down.
>> Unfortuantely however, there seems to be no log / dmesg data available
>> during shutdown as syslog-ng is stopped. The only thing I can confirm
>> that there's no strange output on the console during either bootup or
>> shutdown: All services / daemons start up o.k. and also during shutdown
>> all services seem to come to a proper halt. The root filesystem is
>> re-mounted r/o and the last message reads "Power down" - only to then
>> reboot the system by going through a BIOS power-on sequence.
>
> I would expect you to see a message to the affect "dom0 has shutdown,
> rebooting" from the hypervisor at the very end. You may need a serial
> console to see this though I suppose.
> http://wiki.xen.org/wiki/Xen_Serial_Console
>
I have set up a serial console and the output is attached to this mail.
It did however not contain the message you expected, but that might be
due to the fact that I did not request a reboot but rather a powerdown.
At least that's my guess.
> In fact if the reboot= options don't help then setting up a serial
> console to get at Xen's logs during reboot is probably the next step.
>
> Alternatively I think "console=vga vga=current,keep" will keep the VGA
> for Xen so you can see what is happening, but at the expense of no VGA
> for dom0 (I've never actually tried this myself, but I think it should
> work). This might be OK if you can use ssh to initiate the reboot and
> then taker a photo of the resulting Xen logs.
This was my initial try, but I did not manage to get that working. I
guess, now having the serial console log available, might render this
useless anyways for my case ...
I hope the attached file helps in narrowing the powerdown problem down.
If you require any more informatio, I'd be more than happy to provide that.
Many thanks again ...
>
> Ian.
>
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XEN console
