<div dir="ltr">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?<div><br></div><div>Assuming you're on a GigE network, are all the network devices running in full duplex?</div>
<div><br></div><div>Just some guesses based on the fact that the throughput is almost exactly half.</div><div class="gmail_extra"><br clear="all"><div><div dir="ltr"><span style="font-family:arial,sans-serif;font-size:16px"><strong>Steve Dainard </strong></span><span style="font-size:12px"></span><br>
<span style="font-family:arial,sans-serif;font-size:12px">IT Infrastructure Manager<br>
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<br><br><div class="gmail_quote">On Thu, Sep 26, 2013 at 5:23 AM, Stefano Stagnaro <span dir="ltr"><<a href="mailto:stefanos@prisma-eng.com" target="_blank" onclick="window.open('https://mail.google.com/mail/?view=cm&tf=1&to=stefanos@prisma-eng.com&cc=&bcc=&su=&body=','_blank');return false;">stefanos@prisma-eng.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Hello,<br>
<br>
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.<br>
<br>
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.<br>
<br>
I can't really figure out where the bottleneck could be. I'm using only the default ovirtmgmt network.<br>
<br>
Thank you for your help, any hint will be appreciated.<br>
<br>
Regards,<br>
--<br>
Stefano Stagnaro<br>
IT Manager<br>
<br>
Prisma Engineering S.r.l.<br>
Via Petrocchi, 4<br>
20127 Milano – Italy<br>
<br>
Tel. 02 26113507 int 339<br>
e-mail: <a href="mailto:stefanos@prisma-eng.com" onclick="window.open('https://mail.google.com/mail/?view=cm&tf=1&to=stefanos@prisma-eng.com&cc=&bcc=&su=&body=','_blank');return false;">stefanos@prisma-eng.com</a><br>
skype: stefano.stagnaro<br>
<br>
<br>
<br>
<br>
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</blockquote></div><br></div></div>