[Xen-users] Xen 6.2 NFS performance issues

[Ivan Rodriguez <ivanoch@xxxxxxxxx>]

Hi Users, 

We are trying to use Xen 6 with NFS shared storage, so far the performance is really bad, I've been looking for information in the archive mailing list, I can see a few users with the same problem, but no solutions in the email thread.

Can anyone provide me with some clues ? 

When I do a dd test directly from one of the hosts on the NFS mount I get a
write speed of about 150MBps

 dd if=/dev/zero of=test.dmp bs=1M conv=fdatasync count=1000
1000+0 records in
1000+0 records out
1048576000 bytes (1.0 GB) copied, 6.99829 seconds, 150 MB/s

But when I do the same test on a Cloudstack VM running on the same host
(root disk on the same nfs mount ofcourse) I get a very low write speed.
20MBps.

 dd if=/dev/zero of=test.dmp bs=1M conv=fdatasync count=1000
1000+0 records in
1000+0 records out
1048576000 bytes (1.0 GB) copied, 44.6171 s, 23.5 MB/s

Any ideas how I can improve this ?

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