Considering that you are using PVM, try a benchmark with bonnie++ to check non
sequential read and write on your NFS partition.
----
Alison Barros da Silva
On May 23, 2012, at 5:49 AM, Jude Pereira wrote:
> 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
>
> _______________________________________________
> Xen-users mailing list
> Xen-users@lists.xen.org
> http://lists.xen.org/xen-users
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