CentOS virt - Feb 2013 - CentOS 5.9 Xen DomU NFS Data Transfer to Dom0 kills network.

Greetings,

I have problem using Dom0 as NFS(v4)-server and DomU as client. When 
ever the client actually tries to copy data to nfs-server the virtual 
network (bridge) between the two hosts completely freezes and stops 
working. After this of course the client hangs waiting nfs-server to 
answer and server continues to try to contact nfslock daemon on the client.

Dom0 is still accessible from outside trough virbr0 which the client 
doesn't have access. The problems only come on data transfer as making 
directories and removing them and doind ls works fine before one tries 
to transfer data.

Anyone have suggestion what could fix this behavior.
Veli-Pekka

26.02.2013, 20:01, "Veli-Pekka Kestil?" <centos at
vpk.nu>:
> Greetings,
>
> I have problem using Dom0 as NFS(v4)-server and DomU as client. When
> ever the client actually tries to copy data to nfs-server the virtual
> network (bridge) between the two hosts completely freezes and stops
> working. After this of course the client hangs waiting nfs-server to
> answer and server continues to try to contact nfslock daemon on the client.
>
> Dom0 is still accessible from outside trough virbr0 which the client
> doesn't have access. The problems only come on data transfer as making
> directories and removing them and doind ls works fine before one tries
> to transfer data.
>
> Anyone have suggestion what could fix this behavior.
> Veli-Pekka
> _______________________________________________
> CentOS-virt mailing list
> CentOS-virt at centos.org
> http://lists.centos.org/mailman/listinfo/centos-virt
Did you system logs after data transfer and lock? Maybe you should see with
strace what happening in this time?
-- 
?????? ???? ?????? ?? ?????, ?? ?? ???????? ???????? ? ???????????.

<div> </div><div> </div><div>26.02.2013, 20:01,
"Veli-Pekka Kestilä"
<centos@vpk.nu>:</div><blockquote><p>Greetings,<br
/><br />I have problem using Dom0 as NFS(v4)-server and DomU as client.
When <br />ever the client actually tries to copy data to nfs-server the
virtual <br />network (bridge) between the two hosts completely freezes
and stops <br />working. After this of course the client hangs waiting
nfs-server to <br />answer and server continues to try to contact nfslock
daemon on the client.<br /><br />Dom0 is still accessible from
outside trough virbr0 which the client <br />doesn't have access. The
problems only come on data transfer as making <br />directories and
removing them and doind ls works fine before one tries <br />to transfer
data.<br /><br />Anyone have suggestion what could fix this
behavior.<br />Veli-Pekka<br
/>_______________________________________________<br />CentOS-virt
mailing list<br /><a
href="mailto:CentOS-virt@centos.org">CentOS-virt@centos.org</a><br
/><a
href="http://lists.centos.org/mailman/listinfo/centos-virt">http://lists.centos.org/mailman/listinfo/centos-virt</a></p></blockquote><div>What
size files are
copied?</div><div>http://ubuntuforums.org/archive/index.php/t-1478413.html</div><div> </div><div>--
<br />Трудно жить ничего не делая, но мы привыкли бороться с
трудностями.</div>

On 1.3.2013 13.22, Van wrote:
> 26.02.2013, 20:01, "Veli-Pekka Kestil?" <centos at vpk.nu>:
>
>     I have problem using Dom0 as NFS(v4)-server and DomU as client. When
>     ever the client actually tries to copy data to nfs-server the virtual
>     network (bridge) between the two hosts completely freezes and stops
>     working. After this of course the client hangs waiting nfs-server to
>     answer and server continues to try to contact nfslock daemon on
>     the client.
>
>     Dom0 is still accessible from outside trough virbr0 which the client
>     doesn't have access. The problems only come on data transfer as
>     making
>     directories and removing them and doind ls works fine before one
>     tries
>     to transfer data.
>     <http://lists.centos.org/mailman/listinfo/centos-virt>
>
> What size files are copied?
> http://ubuntuforums.org/archive/index.php/t-1478413.html
I found that thread also.

Size is smaller than that. After sending the e-mail I tested and if 
copying size was small enough it seemingly succeeded. I was planning to 
use strace, but the system was needed for use and I had to resort 
attaching direct disk on the system. This isn't optimal as it is a test 
system for bigger one. Another thing to try would be probably to tie the 
virtual bridge to physical interface on the computer.

Unfortunately I can't test the problem at the moment before I find 
another system to replicate the setup.

-vpk

01.03.2013, 15:22, "Van" <van-1 at
yandex.ru>:
> 26.02.2013, 20:01, "Veli-Pekka Kestil?" <centos at vpk.nu>:
>> Greetings,
>>
>> I have problem using Dom0 as NFS(v4)-server and DomU as client. When
>> ever the client actually tries to copy data to nfs-server the virtual
>> network (bridge) between the two hosts completely freezes and stops
>> working. After this of course the client hangs waiting nfs-server to
>> answer and server continues to try to contact nfslock daemon on the
client.
>>
>> Dom0 is still accessible from outside trough virbr0 which the client
>> doesn't have access. The problems only come on data transfer as
making
>> directories and removing them and doind ls works fine before one tries
>> to transfer data.
>>
>> Anyone have suggestion what could fix this behavior.
>> Veli-Pekka
>> _______________________________________________
>> CentOS-virt mailing list
>> CentOS-virt at centos.org
>> http://lists.centos.org/mailman/listinfo/centos-virt
> What size files are copied?
> http://ubuntuforums.org/archive/index.php/t-1478413.html
>
> --
> ?????? ???? ?????? ?? ?????, ?? ?? ???????? ???????? ? ???????????.
> ,
> _______________________________________________
> CentOS-virt mailing list
> CentOS-virt at centos.org
> http://lists.centos.org/mailman/listinfo/centos-virt
Show the command or line from /etc/fstab whitch you use for mounting NFS-volume.
I think rsize/wsize larger then MTU.
--  
?????? ???? ?????? ?? ?????, ?? ?? ???????? ???????? ? ???????????.