[ovirt-users] used bandwidth when live migrating

[Michal Skrivanek]

> On 25 Nov 2016, at 11:08, Nathanaël Blanchet <blanchet at abes.fr> wrote:
> 
> 
> Le 25/11/2016 à 10:28, Nathanaël Blanchet a écrit :
>> Hi all,
>> 
>> We use in production a dedicated 10G vlan link for live migration. In the cluster option tab I put the migration bandwidth limit to 10000 Mbps. Everything work as expected and now 25 vms on a host migrate in a few seconds (excatly 13), but I'm not able to measure the real consumed bandwidth. I want to evaluate such a thing beacuse my goal is to dedicate a vlan for gluster ont the same 10G nic, and I don't want an overload issue with gluster when vms migrations happen.
>> 
>> So my questions are : how does live migration work? Is it a RAM to RAM transport between two hosts? Are migration bandwidth limited by I/O disk anywhere or by the nic capabilities? Could 10Gbps be fully used for such staff? What would you advice to make work gluster and migration on the same nic (QoS?)
> 
> Is this what I need ? https://www.ovirt.org/develop/release-management/features/network/detailed-host-network-qos/

even the existing QoS capabilities should be enough
Separating storage and migration traffic to different logical networks is indeed a good idea
You can limit the migration bandwidth if it’s not critical, do you have nay specific requirements there?

> 
> Cluster/DC (Data Center) - control the traffic related to a specific logical network throughout the entire cluster/DC, including through its infrastructure (e.g. L2 switches).
> 
> Cluster/DC-wide QoS remains to be handled in the future.
> 
> It seems not to be yet present in 4.0
> 
>> 
>> Thank you for help.
>> 
>> 
> 
> -- 
> Nathanaël Blanchet
> 
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> 
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