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

[Itamar Heim]

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.
>
> Dan.
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I thought we can control both the number of concurrent migrations and 
the bandwidth per migration which defaults to 30MB/s?