6:39 a.m.
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A quick check of the host shows STP=off in ifcfg-ovirtmgmt. I see nothing
about STP elsewhere in the configuration on the host.
-derek
Sent using my mobile device. Please excuse any typos.
On October 3, 2017 7:15:35 AM Colin Coe <colin.coe(a)gmail.com> wrote:
Spanning Tree Protocol.
Make sure the /etc/sysconfig/network-scripts/ifcfg-eth0 (or whatever) does
not have an STP=yes line.
CC
On 3 Oct. 2017 19:11, "Derek Atkins" <derek(a)ihtfp.com> wrote:
> I'm sorry. What is STP?
> And how do I turn that off?
>
> -derek
> Sent using my mobile device. Please excuse any typos.
>
> On October 2, 2017 7:41:15 PM Colin Coe <colin.coe(a)gmail.com> wrote:
>
>> 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" <derek(a)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>
>>> derek(a)ihtfp.com www.ihtfp.com
>>> Computer and Internet Security Consultant
>>> _______________________________________________
>>> Users mailing list
>>> Users(a)ovirt.org
>>> http://lists.ovirt.org/mailman/listinfo/users
>>>
>>
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<div style="color: black;">
<p style="margin: 0 0 1em 0; color: black;">A quick check of the host
shows
STP=off in ifcfg-ovirtmgmt. I see nothing about STP elsewhere in the
configuration on the host. </p>
<p style="margin: 0 0 1em 0; color: black;">-derek<br>
Sent using my mobile device. Please excuse any typos. <br>
</p>
</div>
<div style="color: black;">
<p
style="color: black; font-size: 10pt; font-family: Arial, sans-serif; margin: 10pt
0;">On
October 3, 2017 7:15:35 AM Colin Coe &lt;colin.coe(a)gmail.com&gt; wrote:</p>
<blockquote type="cite" class="gmail_quote"
style="margin: 0 0 0 0.75ex; border-left: 1px solid #808080; padding-left:
0.75ex;">
<div dir="auto">Spanning Tree Protocol.<div
dir="auto"><br></div><div
dir="auto">Make sure the /etc/sysconfig/network-scripts/ifcfg-eth0 (or
whatever) does not have an STP=yes line.</div><div
dir="auto"><br></div><div
dir="auto">CC</div></div><div
class="gmail_extra"><br><div class="gmail_quote">On 3
Oct. 2017 19:11,
"Derek Atkins" <<a
href="mailto:derek@ihtfp.com">derek@ihtfp.com</a>> wrote:<br
type="attribution"><blockquote class="gmail_quote"
style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div>
<div style="color:black">
<div style="color:black">
<p style="margin:0 0 1em 0;color:black">I'm sorry. What is STP?
<br>
And how do I turn that off? </p>
<p style="margin:0 0 1em 0;color:black">-derek<br>
Sent using my mobile device. Please excuse any typos. <br>
</p>
</div>
<div style="color:black">
<p
style="color:black;font-size:10pt;font-family:Arial,sans-serif;margin:10pt
0">On
October 2, 2017 7:41:15 PM Colin Coe <<a
href="mailto:colin.coe@gmail.com"
target="_blank">colin.coe(a)gmail.com</a>&gt; wrote:</p>
<blockquote type="cite" class="gmail_quote"
style="margin:0 0 0 0.75ex;border-left:1px solid
#808080;padding-left:0.75ex">
<div dir="ltr"><div dir="auto"></div><div
class="gmail_extra">Hi</div><div
class="gmail_extra"><br></div><div
class="gmail_extra">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.</div><div
class="gmail_extra"><br></div><div
class="gmail_extra">HTH</div><div
class="gmail_extra"><br></div><div
class="gmail_extra"><br></div><div
class="gmail_extra"><br><div class="gmail_quote">On 3
Oct. 2017 04:56,
"Derek Atkins" <<a href="mailto:derek@ihtfp.com"
target="_blank">derek(a)ihtfp.com</a>&gt; wrote:<br
type="attribution"><blockquote class="gmail_quote"
style="margin:0 0 0 .8ex;border-left:1px #ccc
solid;padding-left:1ex">Hi,<br>
<br>
I'm at my wits end so I'm tossing this here in the hopes that
SOMEONE<br>
will be able to help me.<br>
<br>
tl;dr: Ovirt is doing something on my network that is causing my fiber<br>
modem to go from 3-5ms to 300-1000+ms round trip times. I know it's<br>
ovirt because when I unplug ovirt from my network the issue goes away;<br>
when I plug it back in, the issue recurs.<br>
<br>
Long version:<br>
<br>
I've been running Ovirt 4.0.6 happily on CentOS 7.3 for several months<br>
on a single host machine. Indeed, the host had an uptime of 200+ days<br>
and was working great until approximately midnight, September 21/22<br>
(just over a week ago). I was on an airplane halfway across the<br>
Atlantic at that time, so it wasn't anything I did.<br>
<br>
My network is configured as:<br>
<br>
fiber modem <-> edgerouter <-> switch <->
everything
else<br>
<br>
ovirt is living in the "everything else" area.<br>
<br>
When I sit with a laptop connected to either the everything else range<br>
or even directly connected to the fiber modem, I run 'mtr' and
see<br>
network times (starting at the fiber modem) that bounce all over the<br>
place. When I unplug ovirt I see consistent 3-5ms times. Plug it back<br>
in, voom, back up to badness.<br>
<br>
I've spent several hours plugging and unplugging different devices<br>
trying to isolate the issue. The only "device" that has any
effect is<br>
my ovirt box.<br>
<br>
I have tried to debug this in several ways, but really the only thing<br>
that seems to have helped at all is shutting down all the VMs and the<br>
hosted engine. Once nothing else is running (but the host itself), only<br>
then does the network seem to return to normal.<br>
<br>
I'm really at my wits end on this; I have no idea what is causing this<br>
or what might have changed to cause the issue right at that time. I<br>
also can't imagine what ovirt is doing over the network that could
cause<br>
the modem, two physical hops away, to lose its mind in this way. But my<br>
experiementation is definitely showing a direct correlation.<br>
<br>
Help!!<br>
<br>
-derek<br>
<br>
--<br>
Derek Atkins <a href="tel:(617)%20623-3745"
value="+16176233745"
target="_blank">617-623-3745</a><br>
<a href="mailto:derek@ihtfp.com"
target="_blank">derek(a)ihtfp.com</a> <a
href="http://www.ihtfp.com" rel="noreferrer"
target="_blank">www.ihtfp.com</a><br>
Computer and Internet Security Consultant<br>
______________________________<wbr>_________________<br>
Users mailing list<br>
<a href="mailto:Users@ovirt.org"
target="_blank">Users(a)ovirt.org</a><br>
<a href="http://lists.ovirt.org/mailman/listinfo/users"
rel="noreferrer"
target="_blank">http://lists.ovirt.org/mailman<wbr>/li...
</blockquote></div></div>
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