<div dir="ltr">Hi Ido<div><br></div><div>I updated the database and all seemed to be OK.</div><div><br></div><div>Cheers</div><div class="gmail_extra"><br clear="all"><div><div class="gmail_signature"><div dir="ltr"><div><div dir="ltr"><i>Gary Lloyd</i><div><span style="color:rgb(136,136,136)">______________________________</span><span style="color:rgb(136,136,136)">__________________</span><br><div><span style="color:rgb(136,136,136)">I.T. Systems:Keele University</span><br style="color:rgb(136,136,136)"><span style="color:rgb(136,136,136)">Finance & IT Directorate</span></div><div><span style="color:rgb(136,136,136)">Keele:Staffs:IC1 Building:ST5 5NB:UK</span><br style="color:rgb(136,136,136)"><a href="tel:%2B44%201782%20733073" value="+441782733073" style="color:rgb(17,85,204)" target="_blank">+44 1782 733063</a><br style="color:rgb(136,136,136)"><span style="color:rgb(136,136,136)">______________________________</span><span style="color:rgb(136,136,136)">__________________</span></div></div></div></div></div></div></div>
<br><div class="gmail_quote">On 15 November 2015 at 13:08, Ido Barkan <span dir="ltr"><<a href="mailto:ibarkan@redhat.com" target="_blank">ibarkan@redhat.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Hi Gary.<br>
First, In oVirt 3.6 we will enable editing a few network attributes<br>
while there vms attached to it.<br>
The reason this is forbidden is that until v3.6, by default, vdsm will<br>
recreate the network for<br>
every network edition and this can seriously disturb the network for<br>
the running vms.<br>
Second, if you want to tweak the MTU you should use 'ip link set dev<br>
<dev-name> mtu 9000'<br>
for each device in the network (Bridge, Vlan device, Bond, physical<br>
NIC). Then, you should edit<br>
vdsm persistence json files under both /var/run/vdsm/netconf/<nets/bonds>/<br>
and /var/lib/vdsm/persistence/netconf/<nets/bonds>/. You should find a<br>
file for each network/bond<br>
under those paths.<br>
On the engine DB you should find the proper row in the 'network' table<br>
and update the 'mtu' attribute.<br>
Good luck,<br>
Ido<br>
<br>
On Thu, Nov 12, 2015 at 4:45 PM, Gary Lloyd <<a href="mailto:g.lloyd@keele.ac.uk">g.lloyd@keele.ac.uk</a>> wrote:<br>
> Hi we have upgraded to ovirt 3.5.5 and it seems to have gone well. However<br>
> when we initially configured one of our clusters (back in the day of ovirt<br>
> 3.2) we forgot to adjust two of our vm guest bridges that we use for iscsi<br>
> traffic to an mtu of 9000.<br>
><br>
> We have around 50 or so vms using these bridges and we cant change the mtu<br>
> on the data center screen due to the vms being attached to the bridges (This<br>
> message comes up trying to change it).<br>
><br>
> We were able to easily override the settings on the hosts in prior versions<br>
> of ovirt (but I don't remember where we did it). Our current 3.4 cluster is<br>
> fine, but I am now setting up a 3.5 cluster with new servers.<br>
> I don't see how changing it to 9000 will cause us any problems due to the<br>
> fact that our older clusters are running those bridges at 9000 anyway.<br>
><br>
> Also has anyone experienced the new ui not being as responsive when showing<br>
> the state of vm migrations (doesn't seem to refresh very well on the hosts<br>
> screen).<br>
><br>
> Does anyone know if there a way I can force the value to mtu 9000 in the<br>
> database somewhere without blowing it up ?<br>
><br>
> Cheers<br>
><br>
> Gary Lloyd<br>
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<span class="HOEnZb"><font color="#888888"><br>
<br>
<br>
--<br>
Thanks,<br>
Ido Barkan<br>
</font></span></blockquote></div><br></div></div>