Are you duplicating the traffic over the same physical network by relaying through the VM, rather than writing directly to network storage, thereby halving the write performance?

Assuming you're on a GigE network, are all the network devices running in full duplex?

Just some guesses based on the fact that the throughput is almost exactly half.

SteveDainard
IT Infrastructure Manager
Miovision | Rethink Traffic
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On Thu, Sep 26, 2013 at 5:23 AM, Stefano Stagnaro <stefanos@prisma-eng.com> wrote:
Hello,

I'm testing oVirt 3.3 with GlusterFS libgfapi back-end. I'm using a node for engine and one for VDSM. From the VMs I'm mounting a second GlusterFS volume on a third storage server.

I'm experiencing very bad transfer rates (38MB/s) writing from a client to a VM on the mounted GlusterFS. On the other hand, from the VM itself I can move a big file from the root vda (libgfapi) to the mounted GlusterFS at 70MB/s.

I can't really figure out where the bottleneck could be. I'm using only the default ovirtmgmt network.

Thank you for your help, any hint will be appreciated.

Regards,
--
Stefano Stagnaro
IT Manager

Prisma Engineering S.r.l.
Via Petrocchi, 4
20127 Milano Italy

Tel. 02 26113507 int 339
e-mail: stefanos@prisma-eng.com
skype: stefano.stagnaro




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