4:21 p.m.
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Hello.
I am facing a pretty bizzare problem in two of my Nodes running oVirt. A
given VM running a few hundred Mbps of traffic simply stops passing
traffic and only recovers after a reboot. Checking the bridge with
'brctl showmacs BRIDGE' I see the VM's MAC address missing during this
event.
It seems the bridge simply unlearn the VM's mac address which only
returns when the VM is rebooted.
This problems happened in two different Nodes running in different
hardware, in different datacenter, in different network architecture,
different switch vendors and different bonding modes.
The main differences these Nodes have compared to others I have and
which don't show this problem are:
- The CentOS 7 installed is a Minimal installation instead of oVirt-NG
- The Kernel used is 4.12 (elrepo) instead of the default 3.10
- The ovirtmgmt network is used also for the Virtual Machine
showing this problem.
Has anyone have any idea if it may have anything to do with oVirt (any
filters) or any of the components different from a oVirt-NG installation ?
Thanks
Fernando
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<font face="arial, helvetica, sans-serif">Hello.<br>
<br>
I am facing a pretty bizzare problem in two of my Nodes running
oVirt. A given VM running a few hundred Mbps of traffic simply
stops passing traffic and only recovers after a reboot. Checking
the bridge with 'brctl showmacs BRIDGE' I see the VM's MAC address
missing during this event.<br>
<br>
It seems the bridge simply unlearn the VM's mac address which only
returns when the VM is rebooted.<br>
This problems happened in two different Nodes running in different
hardware, in different datacenter, in different network
architecture, different switch vendors and different bonding
modes.<br>
<br>
The main differences these Nodes have compared to others I have
and which don't show this problem are:<br>
- The CentOS 7 installed is a Minimal installation instead of
oVirt-NG<br>
- The Kernel used is 4.12 (elrepo) instead of the default 3.10<br>
- The ovirtmgmt network is used also for the Virtual Machine
showing this problem.<br>
<br>
Has anyone have any idea if it may have anything to do with oVirt
(any filters) or any of the components different from a oVirt-NG
installation ?<br>
<br>
Thanks<br>
Fernando<br>
</font>
</body>
</html>
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Hello Pavel
What you mean by another oVirt instance ? In one Datacenter it has 2
different clusters (or Datacenter in oVirt way of orrganizing things),
but in the other Datacenter the oVirt Node is standlone.
Let me know.
Fernando
On 12/07/2017 16:49, Pavel Gashev wrote:
Fernando,
It looks like you have another oVirt instance in the same network
segment(s). Don’t you?
*From: *<users-bounces(a)ovirt.org> on behalf of FERNANDO FREDIANI
<fernando.frediani(a)upx.com>
*Date: *Wednesday, 12 July 2017 at 16:21
*To: *"users(a)ovirt.org" <users(a)ovirt.org>
*Subject: *[ovirt-users] Bizzare oVirt network problem
Hello.
I am facing a pretty bizzare problem in two of my Nodes running oVirt.
A given VM running a few hundred Mbps of traffic simply stops passing
traffic and only recovers after a reboot. Checking the bridge with
'brctl showmacs BRIDGE' I see the VM's MAC address missing during this
event.
It seems the bridge simply unlearn the VM's mac address which only
returns when the VM is rebooted.
This problems happened in two different Nodes running in different
hardware, in different datacenter, in different network architecture,
different switch vendors and different bonding modes.
The main differences these Nodes have compared to others I have and
which don't show this problem are:
- The CentOS 7 installed is a Minimal installation instead of oVirt-NG
- The Kernel used is 4.12 (elrepo) instead of the default 3.10
- The ovirtmgmt network is used also for the Virtual Machine
showing this problem.
Has anyone have any idea if it may have anything to do with oVirt (any
filters) or any of the components different from a oVirt-NG installation ?
Thanks
Fernando
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<p>Hello Pavel</p>
<p>What you mean by another oVirt instance ? In one Datacenter it
has 2 different clusters (or Datacenter in oVirt way of
orrganizing things), but in the other Datacenter the oVirt Node is
standlone.</p>
<p>Let me know.</p>
<p>Fernando<br>
</p>
<br>
<div class="moz-cite-prefix">On 12/07/2017 16:49, Pavel Gashev
wrote:<br>
</div>
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<div class="WordSection1">
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:Calibri;mso-fareast-language:EN-US">Fernando,<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:Calibri;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:Calibri;mso-fareast-language:EN-US">It
looks like you have another oVirt instance in the same
network segment(s). Don’t you?<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:Calibri;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:Calibri;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<div style="border:none;border-top:solid #B5C4DF
1.0pt;padding:3.0pt 0cm 0cm 0cm">
<p class="MsoNormal"><b><span
style="font-family:Calibri;color:black">From: </span>
</b><span style="font-family:Calibri;color:black"><a
class="moz-txt-link-rfc2396E"
href="mailto:users-bounces@ovirt.org"><users-bounces@ovirt.org></a>
on behalf of FERNANDO FREDIANI
<a class="moz-txt-link-rfc2396E"
href="mailto:fernando.frediani@upx.com"><fernando.frediani@upx.com></a><br>
<b>Date: </b>Wednesday, 12 July 2017 at 16:21<br>
<b>To: </b><a class="moz-txt-link-rfc2396E"
href="mailto:users@ovirt.org">"users@ovirt.org"</a> <a
class="moz-txt-link-rfc2396E"
href="mailto:users@ovirt.org"><users@ovirt.org></a><br>
<b>Subject: </b>[ovirt-users] Bizzare oVirt network
problem<o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<p class="MsoNormal"><span
style="font-family:Arial">Hello.<br>
<br>
I am facing a pretty bizzare problem in two of my Nodes
running oVirt. A given VM running a few hundred Mbps of
traffic simply stops passing traffic and only recovers after
a reboot. Checking the bridge with 'brctl showmacs BRIDGE' I
see the VM's MAC address missing during this event.<br>
<br>
It seems the bridge simply unlearn the VM's mac address
which only returns when the VM is rebooted.<br>
This problems happened in two different Nodes running in
different hardware, in different datacenter, in different
network architecture, different switch vendors and different
bonding modes.<br>
<br>
The main differences these Nodes have compared to others I
have and which don't show this problem are:<br>
- The CentOS 7 installed is a Minimal installation
instead of oVirt-NG<br>
- The Kernel used is 4.12 (elrepo) instead of the
default 3.10<br>
- The ovirtmgmt network is used also for the Virtual
Machine showing this problem.<br>
<br>
Has anyone have any idea if it may have anything to do with
oVirt (any filters) or any of the components different from
a oVirt-NG installation ?<br>
<br>
Thanks<br>
Fernando<br>
<br>
</span><o:p></o:p></p>
</div>
</blockquote>
<br>
</body>
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FERNANDO FREDIANI -
Pavel Gashev