Re: [Users] Is it possible to limit migration speed and number of concurrent migrations?

On 11/29/2013 02:08 PM, Dan Kenigsberg wrote: >On Fri, Nov 29, 2013 at 11:49:05AM +0100, Ernest Beinrohr wrote: >>I want to put some of my hvs to maintenance, but that causes a >>migration storm, which causes an temporary unavailability of the hv >>and ovirt fences it, while migrations are still running. >> >>So I have to migrate one-by-one manually and then put the hv to maintenance. >> >>Is it possible to limit migration speed and number of concurrent migrations? > >You could set max_outgoing_migrations to 1 (in each >/etc/vdsm/vdsm.conf), but even a single VM migrating may choke your >connection (depends which wins, the CPU running qemu, or your >bandwidth). > >Currently, your only option is to define a migration network for your >cluster (say, over a different nic, or over a vlan), and use tools >external to ovirt to throtle the bandwidth on it (virsh net-edit ><network name> and http://libvirt.org/formatnetwork.html#elementQoS can >come up handy). ovirt-3.4 should expose the ability to set QoS limits on >migration networks. > I thought we can control both the number of concurrent migrations and the bandwidth per migration which defaults to 30MB/s?