after a bit of playing with the system, I found a nice workaround: I added a host route on each host:
# route add -host 10.100.101.101 gw 172.22.22.1 and on the other one: # route add -host 10.100.101.100 gw 172.22.22.2 where 10.100.101/24 is the slow network and 172.22.22/24 is the fast network. migration now works through the fast link, with nothing changed in ovirt's configuration. Yuval On Sun, Jan 6, 2013 at 11:49 PM, Dan Kenigsberg <dan...@redhat.com> wrote: > 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 > >
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