[ovirt-users] Re: Infiniband Usage / Support

[Douglas Duckworth]

You can change the MTU in the network config in oVirt engine.  The management 
portal.   Go to clusters then networks or something like that.  You can then 
modify the MTU.

MTU can also be set manually in network scripts on the host but you need to 
define this in the engine.  At least this is how I got Infiniband working.  I 
can send screenshots on Monday.

On Fri, Mar 8, 2019, 6:20 AM Andrey Rusakov 
mailto:anrusa...@gmail.com>> wrote:
Some details, step by step.

Install OS, Install OFED,
Create Bond for ib0 and ib1 - bond0
Set IP to bond0, and MTU to 65520.
Add Host to oVirt Cluster
At this moment of time everything is Fine.

Next step.
Assign New network to bond0, oVirt set MTU to 1500, and ... That is all. No 
storage, No IP. I can't change MTU to 2044 or 65520 and can't assign IP to IB 
interface.

From system perspective i do understand why.
oVirt Creates new bridge using brctl - and brctl didn't support IPoIB, but how 
can i change it back to original config?
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[ovirt-users] Re: Infiniband Usage / Support

[Strahil]

When you create the new network, can't you set the MTU also?
I know that UI allows changing MTU, but never checked if it can be set during 
definition.

Best Regards,
Strahil Nikolov
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[ovirt-users] Re: Infiniband Usage / Support

[Andrey Rusakov]

Some details, step by step.

Install OS, Install OFED, 
Create Bond for ib0 and ib1 - bond0
Set IP to bond0, and MTU to 65520.
Add Host to oVirt Cluster 
At this moment of time everything is Fine.

Next step.
Assign New network to bond0, oVirt set MTU to 1500, and ... That is all. No 
storage, No IP. I can't change MTU to 2044 or 65520 and can't assign IP to IB 
interface.

From system perspective i do understand why.
oVirt Creates new bridge using brctl - and brctl didn't support IPoIB, but how 
can i change it back to original config?
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[ovirt-users] Re: Infiniband Usage / Support

[Андрей Русаков]

Hi,

Yes, OFED is installed.
The point is that IPoIB uses MTU 2044 or 65520.
When I assign New network to IB device / IB bond, oVirt set MTU to 1500,
and ... That is all. I can't change it to 2044 or 65520 and can't assign IP
to IB interface (i would like to use it as storage network as well)

чт, 7 мар. 2019 г. в 19:39, Douglas Duckworth :

> It works out of the box if you have OFED on hosts
>
> On Wed, Mar 6, 2019, 1:32 PM Andrey Rusakov  wrote:
>
>> Hi,
>>
>> looking for help...
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>

-- 
С Уважением.
Русаков Андрей.
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[ovirt-users] Re: Infiniband Usage / Support

[Douglas Duckworth]

It works out of the box if you have OFED on hosts

On Wed, Mar 6, 2019, 1:32 PM Andrey Rusakov 
mailto:anrusa...@gmail.com>> wrote:
Hi,

looking for help...
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[ovirt-users] Re: Infiniband Usage / Support

[Andrey Rusakov]

Hi,

looking for help...
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