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

[Pasi Kärkkäinen <pasik@xxxxxx>]

On Thu, Nov 05, 2009 at 10:01:37AM -0600, Thaddeus Hogan wrote:
> 
> 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 ran the backup with my Bacula setup that I have been using for over a
> year. The client is a domU. The dom0 on that host is running the Bacula
> storage daemon, which accepts data for backup over the network and writes
> it to some locally attached device. In my case the dom0 has two eSATA
> attached drives that are used for backups and all domUs on that host write
> their backups over the network to that storage. 
> 
> When I ran the backup I was sustaining about 500mbit from the domU to the
> dom0. After 4.5 hours Nagios reported that the whole host and all domUs had
> dropped off the network. When I looked at the console on the host it was
> hung, the screen was blank, and I couldn't backscroll or see any console
> messages. 
> 
> The next day I tried the backup again. I was sustaining about 500mbit of
> network traffic from the DomU to the dom0 again, and after 45 minutes the
> host crashed. I had the console already connected to a KVM and was able to
> look at it immediately. Again the screen was blank and there were no
> console messages accessible. 
> 

Set up a serial console so you can capture the (error/crash) messages..

-- Pasi



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