On Sun, Jan 06, 2013 at 10:08:48PM +0200, Yuval M wrote:
Hi, I'm running the following setup: 2 hosts, each has 2 physical NICs, the first NIC (which is bridged to ovirtmgmt) is a 100Mbps ethernet card connected to a switch (and to the internet) the 2nd NIC is a fast Infiniband card which is connected back-to-back to the other host.
both links are running fine, and I managed to have the 2nd host mount the storage via the fast link. The problem is that VM migration takes place over the slow link.
How do I configure the cluster so that the migration uses the fast link? I've already created a network using the web interface. the migration still uses the slow link.
Currently, oVirt always uses the ovirtmgmt network for migration data, even though libvirt already supports choosing a non-mananagement IP address for that. So I do not see how you could use the Infiniband card for migration without defining ovirtmgmt there, or with serious vdsm hacking. When I'm saying "serious", I mean something in the lines of (the untested!) http://gerrit.ovirt.org/10696 . To use this patch, you would first need to define a non-VM network over the Infiniband connection on both hosts, and provide them with IP address. Then, the name of this network should be passed as the value of a VM custom propery call 'mignet'. It would be great if you can try it out and debug it and/or comment on it. Dan