[ovirt-users] used bandwidth when live migrating

[Nathanaël Blanchet]

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?)

Thank you for help.


-- 
Nathanaël Blanchet

Supervision réseau
Pôle Infrastrutures Informatiques
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blanchet at abes.fr