12:23 p.m.
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(a)prisma-eng.com
skype: stefano.stagnaro
1:09 a.m.
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.
*Steve Dainard *
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On Thu, Sep 26, 2013 at 5:23 AM, Stefano Stagnaro
<stefanos(a)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(a)prisma-eng.com
skype: stefano.stagnaro
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Steve Dainard