Re: [Xen-users] Dom0 Crash - High Network Load - Debian Lenny Xen 3.2-1

[Pasi Kärkkäinen <pasik@xxxxxx>]

On Fri, Feb 12, 2010 at 11:06:59PM +0100, Andrea Janna wrote:
> -------- Original message --------
> From: Thaddeus Hogan <thaddeus@xxxxxxxxxx>
> Date: 05/11/2009 17.01
>> I'm looking for a place to start with a problem I am having where I think
>> high network load is crashing my Xen host. Any help you can offer is
>> greatly appreciated!
>>
>> I started having an issue with my dom0 crashing when under very high
>> network load. I discovered this when I ran a large backup (1.7 TB) on a
>> domU.
>>    
>
> I had a similar problem last month. I'm running a Debian Lenny dom0 with  
> 3 Lenny domUs. Kernel 2.6.26 and all software packages are Lenny 
> releases.
> I use Bacula for backups on a DAT 72 tape device. Dom0 is running Bacula  
> storage daemon, which manage the DAT device itself.
> If I run a domU backup (Bacula file daemon running in domU and sending  
> data to dom0 over IP, Xen bridged networking) the system becomes  
> unstable after several minutes of backup. Sometimes dom0 crashes and  
> reboots. Sometimes domUs IP network stops working.
> If I don't perform domU backup the system is stable.
> If I run a backup of another computer (Bacula file daemon running on a  
> Windows box), Lenny computer remains stable. So I suppose issue is  
> related to higher disk activity when Bacula file daemon is running in  
> domU. Dom0 and DomUs share the same physical disk, a SATA soft raid5  
> array. When I run a backup of a Windows computer data is sent to Bacula  
> storage daemon in dom0 via IP ethernet network and Bacula storage daemon  
> writes that data on tape.
> I didn't have time to investigate further, cause I needed the system  
> working for production.

Wondering if these would have helped:
http://wiki.xensource.com/xenwiki/XenBestPractices

> I solved this issue installing Xen 3.4 (back-ported from Debian Squeeze)  
> and Suse Linux Enterprise 11 kernel  
> (http://wiki.xensource.com/xenwiki/XenDom0Kernels) on dom0 only.
> Be aware that on Suse kernel some Xen networking features are compiled  
> as modules, so you need to load them before starting domUs.
>

Yeah, SLES11 Xen kernel should be much more stable than lenny's.

-- Pasi


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