Try changing that custom MTU and hitting OK. I get:

on 3.5 and 3.5.1. What version are you running?

> On Jan 27, 2015, at 2:04 PM, Donny Davis <[email protected]> wrote:
> 
> Maybe I missed your question, but I can change the MTU from the gui without 
> any problems. As long as you make sure there are not any vm's on the host you 
> are trying to sync, I have experienced no issues. 
> 
> Donny
> 
> -----Original Message-----
> From: Darrell Budic [mailto:[email protected]] 
> Sent: Tuesday, January 27, 2015 12:30 PM
> To: Donny Davis
> Cc: [email protected]
> Subject: Re: [ovirt-users] change network MTU settings without taking all the 
> VMs down?
> 
> Except you can’t change the network MTU setting in the first place on the 
> network in the GUI. I’ve thought about doing it in the database, with a 
> migration as you mention. Just checking first for better options :)
> 
> 
>> On Jan 27, 2015, at 12:08 PM, Donny Davis <[email protected]> wrote:
>> 
>> Migrate the vms between hosts, and when a host gets to no running VMS you 
>> can sync that network. 
>> 
>> Donny D
>> cloudspin.meOn Jan 27, 2015 10:43 AM, Darrell Budic <[email protected]> 
>> wrote:
>>> 
>>> I finally got a couple of networks our from behind a wan based layer 2 
>>> bridge that required me to run at MTU 1448, and would like to get back up 
>>> to MTU 1500. I see the GUI won’t let me do that while the network is in 
>>> use. Any way around this, clean or otherwise? Restarting VMs to update them 
>>> is ok, just trying to avoid having to take everything down at the same time.
>>> 
>>> -Darrell
>>> _______________________________________________
>>> Users mailing list
>>> [email protected]
>>> http://lists.ovirt.org/mailman/listinfo/users
> 
> <Capture.PNG>

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