Re: [Xen-users] Xen DomU Communication Problems

Stephan Seitz
2008-02-15T16:40:09Z

> 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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