Il 04/09/2013 17:24, Alex Bligh ha scritto: > We have seen a situation when migrating about 50 VMs at once where some > of them fail. I think this is because they are dirtying pages faster than > they can be transmitted.
No, migration never "gives up". It may never converge, but it keeps trying until cancelled. Could it be that you are choosing migration server ports from a small range, and some of them are failing because two migrations pick the same random port for the destination (which is where the server socket lies)? Paolo > What algorithm controls when migration fails in this way, and is it > tunable? > > I am fully aware one answer to this question is "do not attempt to > migrate 50 busy VMs through a single 1GB/s NIC".
