[Xen-users] QOS for NFS backed disks / VM lags with high IO?

[Nathan March <nathan@xxxxxx>]

dm-ioband seems to be the generally accepted solution to implement disk 
bandwidth controls, but unless I'm misunderstanding it doesn't seem 
possible to use this for nfs backed disks (netapp filer). Can someone 
point me in the direction of what I'm looking for here? Haven't had any 
luck with google / lists to see what other people are using, is this 
even possible?
Currently I'm able to cause lag spikes on all the DomU's of a particular 
Dom0 by running bonnie++ inside one of them, I'd like to be able to put 
something in place that'll keep a single DomU from saturating the 
storage. Alternatively if anyone knows what I've failed to tune to avoid 
this happening at all, that would be appreciated =)
It doesn't affect other Dom0's and then netapp stats show low usage, so 
seems to be a nfs client issue.... nfsstat shows 0 retrans and I am 
using jumbo frames.
Mounting with: 
rw,nosuid,noatime,nfsvers=3,tcp,rsize=32768,wsize=32768,bg,hard,intr
Thanks,
Nathan

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