[Xen-users] DomU very slow over NFS

[Jude Pereira <judepereira@xxxxxxxxxxxxxx>]

Hi,

I'm having trouble setting up xen. Our VMs are on an NFS mount point.

/var/lib/nfs/xen_storage is mounted over NFS

If I cd to that directory, and I do a simple dd benchmark, it writes at 112 MB/s, The VM files are located here, they are preallocated from /dev/zero.

If I start one DomU, the write speed inside that VM is ~7 MB/s(measured via dd).

What could be the cause of this? If the VM is on local storage, then the write speeds are perfect(80 MB/s), but when they are over an NFS, they write very very slow.

It certainly is not a NFS issue, as I can write to it at 112 MB/s, in a mounted directory.

Any help is appreciated,

Thanks in Advance,

Jude

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