RE: [Xen-users] Xen 3.0.0 - NFS Problems?

["Ian Pratt" <m+Ian.Pratt@xxxxxxxxxxxx>]

> I know that NFS was a problem with the older kernels, but we 
> are currently seeing a problem when a system is placed under 
> a high file transfer load that it crashes not only the domU 
> but the dom0 as well. I am using NFS on a central server that 
> handles transfers fine and when you give the dom0 a high 
> diskload or nfs load it is fine, but i a domU gets one it 
> will die. We aren't using a direct xen nfs mount, but the 
> file backed method. Also it gives 0 error logs 0 debug logs, 
> just a total freeze, processor load goes to 99.0% then to .2% 
> in xm top but the system is hung. Does anyone have any idea 
> of where to look or any suggestions as to how to solve this? 
> We like the file method for storage, because all of our 
> scripts are setup for this. Also rebuilding a 1.5TB NFS array 
> just doesn't sound pleasant right now.

This is a well-known issue with native linux -- heavy writes through a
loop device to an NFS filesystem will cause the kernel to run out of
memory and Oops. 

Ian 

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