Le 25/11/2016 à 15:25, Michal Skrivanek a écrit :
On 25 Nov 2016, at 11:08, Nathanaël Blanchet <[email protected]> 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?
If I understand what is explained, host network QoS level is what I
need. To do that, it is enough to declare the predefined QoS in the
edition of the logical network, so that the traffic will be limited on
all the physical nics being used by this vlan. Tell me if I'm wrong.
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
[email protected]
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--
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
[email protected]
_______________________________________________
Users mailing list
[email protected]
http://lists.ovirt.org/mailman/listinfo/users
