Re: [Xen-users] NFS between domU and dom0 causes the virtual network to freeze! Please help

[Martin Fernau <m.fernau@xxxxxxxxxx>]

I need to mention that I currently have xen 3.3 and xen-tools 3.3 installed 
with kernel 2.6.21-xen on gentoo (both dom0 and domU have gentoo installed 
and both use the same kernel version).

Am Donnerstag, 16. Oktober 2008 schrieb Martin Fernau:
> Hello,
>
> I'm a new user to Xen, so please be patient with me.
> I just installed a dom0 on my root-server and I also got a xenU to work
> with routed network. I can access from both sides and I can access both
> machines from any other computer too.
> So far - so good.. (gentoo on both ends by the way)
>
> My plan was to use a mounted NFS-directory from dom0 on my domU to place
> /home (and later other directories too) physically on the dom0 (for easy
> backups running from the dom0). I think this is a typically setup from a
> xen environment.
>
> Well, the mount of the exported nfs-directory on my domU works well. I can
> do a listing, I can touch a file and I even can copy a small testfile
> (several 100k) over the NFS. But when I try to copy a larger File (several
> MBs) the network to my domU freezes! The domU isn't reachable any more.
> Neither from dom0 nor from any other computer.
> The dom0 is working normal - I can reach all the places and can ping
> anywhere. Only domU is affected. It seems that the virtual network of xen
> is crashed. The OS itself of the domU isnt affected as I can just use the
> xen-console to attach to the domU. There I can't see any strange things -
> only the network isn't working any more.
> Furthermore I can't restart my domU. It seems that xen can't attach the
> vif1.0 Interface the the domU any more. My only chance is a complete reset
> of the whole dom0 (restarting)!
> It seems that this problem have something to do with NFS as I can copy
> larger files (several 100MBs) using netcat. This don't break anything. It
> must have something to do with nfs.
> Are there any information I can provide for more details about this
> problem? Are there any known bugs about nfs over xen? What can I do to
> collect more debugging informations to get ideas where the problem maybe
> resides? Can this have something to do with wsize or rsize of the nfs
> protocol?
>
> Any help would be really appreciated as I urgently need to get this machine
> to work with all its domUs!

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