[CentOS-virt] CentOS 5.9 Xen DomU NFS Data Transfer to Dom0 kills network.

Veli-Pekka Kestilä centos at vpk.nu
Wed Mar 6 07:01:08 UTC 2013

On 1.3.2013 16.40, Van wrote:
> 01.03.2013, 15:22, "Van" <van-1 at yandex.ru>:
>> 26.02.2013, 20:01, "Veli-Pekka Kestilä" <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.
> Show the command or line from /etc/fstab whitch you use for mounting NFS-volume. I think rsize/wsize larger then MTU.
> --
> Трудно жить ничего не делая, но мы привыкли бороться с трудностями.
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Thank you for taking the time.

Yes. They are bigger,  rsize=32768, wsize=32768 and MTU:1500

So growing MTU or decreasing rsize and wsize could solve the problem? 
Need to create new test system to test this.


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