Hi We saw something very similar to this a couple of years ago. In our case, it was caused by STP being enabled on our hypervisors.
HTH On 3 Oct. 2017 04:56, "Derek Atkins" <de...@ihtfp.com> wrote: > Hi, > > I'm at my wits end so I'm tossing this here in the hopes that SOMEONE > will be able to help me. > > tl;dr: Ovirt is doing something on my network that is causing my fiber > modem to go from 3-5ms to 300-1000+ms round trip times. I know it's > ovirt because when I unplug ovirt from my network the issue goes away; > when I plug it back in, the issue recurs. > > Long version: > > I've been running Ovirt 4.0.6 happily on CentOS 7.3 for several months > on a single host machine. Indeed, the host had an uptime of 200+ days > and was working great until approximately midnight, September 21/22 > (just over a week ago). I was on an airplane halfway across the > Atlantic at that time, so it wasn't anything I did. > > My network is configured as: > > fiber modem <-> edgerouter <-> switch <-> everything else > > ovirt is living in the "everything else" area. > > When I sit with a laptop connected to either the everything else range > or even directly connected to the fiber modem, I run 'mtr' and see > network times (starting at the fiber modem) that bounce all over the > place. When I unplug ovirt I see consistent 3-5ms times. Plug it back > in, voom, back up to badness. > > I've spent several hours plugging and unplugging different devices > trying to isolate the issue. The only "device" that has any effect is > my ovirt box. > > I have tried to debug this in several ways, but really the only thing > that seems to have helped at all is shutting down all the VMs and the > hosted engine. Once nothing else is running (but the host itself), only > then does the network seem to return to normal. > > I'm really at my wits end on this; I have no idea what is causing this > or what might have changed to cause the issue right at that time. I > also can't imagine what ovirt is doing over the network that could cause > the modem, two physical hops away, to lose its mind in this way. But my > experiementation is definitely showing a direct correlation. > > Help!! > > -derek > > -- > Derek Atkins 617-623-3745 <(617)%20623-3745> > de...@ihtfp.com www.ihtfp.com > Computer and Internet Security Consultant > _______________________________________________ > Users mailing list > Users@ovirt.org > http://lists.ovirt.org/mailman/listinfo/users >
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