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Re: [Xen-users] XEN 4.4 Freezes after long period of inactivity

  • To: xen-users@xxxxxxxxxxxxx
  • From: Niels Dettenbach <nd@xxxxxxxxxxxx>
  • Date: Mon, 14 Sep 2015 13:57:52 +0200
  • Delivery-date: Mon, 14 Sep 2015 11:58:17 +0000
  • List-id: Xen user discussion <xen-users.lists.xen.org>

Am Montag, 14. September 2015, 12:24:47 schrieb pietrop:
> Well .. I actually I have no idea about which files is the right file to
> look at for these king of issues in the /var/log/xen/ folder, I see a
> lot of files having the VMs' name and a couple of qemu-* and booloader*,
> which one should be report something ?

In /var/log/xen there are usually logs related to DomU work - i would check 
first Xen HV and Dom0 (kernel) related log output (like on any linux system). 

Depending from your setup they might be part of your system log files or to 
find under 

/var/log or 



Risk a look into the DomU logs might be help too...

But if your system "dies" directly before it can write anything about the 
error/problem onto a disk, a serial console is the only option i see...

> Nevertheless if you have a quick tip to give to me to DISABLE such
> optimization please let me know, I will give them a quick try this
> weekend.
This is part of your hardware and hardly depends on it. Look for something 
like "APM" (advanced power management"), "power management" or "eco mode" (go 
to "full performance" or "no power saving" or similiar in BIOS, iLo, iDRAC or 
whatever your hardware platform offers here.

if an apmd is running:

/etc/init.d/apmd stop

In your Dom0 make shure that there is nothing like a "suspend" or "hibernate" 
mode / service or similiar active (depends from your distribution). I can give 
you just some "words" here to possibly look for deeper...

If you have some service which plays around with CPU performance levels, 
disable it too (upower, cpupower and similiar) - make little sense on such a 

Personally i'm disable anything during my own kernel build for Dom0 and DomU 
which isn't required on that installation to be sure it isn't in the way. But 
this is not everybodies first option Ã)...

hth a bit,


 Niels Dettenbach
 Syndicat IT & Internet
 PGP: https://syndicat.com/pub_key.asc

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