Re: [Xen-users] Xen DomU Communication Problems

[Stephan Seitz <s.seitz@xxxxxxxxxxxx>]

> Good Morning,
Depends ;)


> I have a Xen machine with a domU that provides backups for our 
> department. The domU is running Bacula. The dom0 hosts the bacula 
> storage daemon which communicates with the tape device connected to the 
> dom0.
> I recently moved our file server onto this machine under this dom0. 
> Prior to this move, backups worked fine on the file server as well as 
> everything else. However, post move, whenever I attempt to back up the 
> file server I lose network on both domUs (the backup server and the file 
> server) until I either kill the bacula storage daemon on the dom0 or 
> console in to the backup server and kill bacula from there. After that, 
> networking returns to both domUs immediately.
I've always noticed problems when using load-intensive apps directly on dom0.

If you're lucky, you've got enough cores and could try to cpu-pin dom0 and
domU's to different, dedicated cores. If your domU's are HVM, you should
check if the netfront modules are loaded and used.
Anyway, I would prefer to look on how to get the tape drive available in
your bacula domU and leave dom0 for managing stuff.


> These two domUs are the only domUs on this machine. Networking is never 
> affected on the dom0, just the domUs. Backing up all other servers still 
> works just fine.
> I am frankly stumped. I am running a debian distribution, and have tried 
> upgrading the kernel to version 2.6.18 and upgrading to the most recent 
> Xen hypervisor 3.0.3.1 revision, all without luck in solving the problem.
> If anyone has any ideas or has run into this problem and found a 
> solution, your advice would be greatly appreciated.
> Sincerely,
> Sarah
>
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--
Stephan Seitz
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