Re: [Xen-users] Xen DomU Communication Problems

Sarah Scheibe
2008-02-15T18:12:15Z

Stephan,

Thank you for your response.

I agree that the ideal solution is to get the tape drive to the domU.
However, I''ve tried pci passthrough in the past several times and so
far
have had absolutely no luck. I''m very open to suggestions as to how I
can
make this tape drive accessible to the domU.

~Sarah

Stephan Seitz wrote:
>> 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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