Re: [Users] Choosing which network to run VM migration on ovirt 3.1

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