Re: [ovirt-users] used bandwidth when live migrating
On 25 Nov 2016, at 11:08, Nathanaël Blanchet <blanchet(a)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/detaile...
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
Supervision réseau
Pôle Infrastrutures Informatiques
227 avenue Professeur-Jean-Louis-Viala
34193 MONTPELLIER CEDEX 5
Tél. 33 (0)4 67 54 84 55
Fax 33 (0)4 67 54 84 14
blanchet(a)abes.fr
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