On Tue, Jul 28, 2015 at 04=19=46PM +0100, Dr. David Alan Gilbert wrote: > * Eduardo Otubo (eduardo.ot...@profitbricks.com) wrote: > > Hello all, > > > > I'm facing a weird behavior on my tests: I am able to live migrate > > between two virtual machines on my localhost, but not to another > > machine, both using tcp. > > > > * I am using the same arguments on the command line; > > * Both virtual machines uses the same qcow2 file visible through NFS; > > * Both machines are in the same subnet; > > * Migration is being done from intel to intel; > > * Same version of Qemu (github master - f8787f8723); > > > > Using all above I am able to live migrate on the same host: between two > > vms on local host or between two vms in the remote host; but when > > migrating from local to remote, the guest hangs. I still can access its > > console via ctrl+alt+2, though, and everything seems to be normal. If I > > issue a reboote via console on the remote, the guest gets back to > > normal. > > > > Am I missing something here? > > Just checking, but are you saying that as far as qemu is concerned, the > migration > is happy, it's just the guest that's hung?
That's exactly the case. The console (via ctrl+alt+2) is active and responding to all commands normally, but the screen (ctrl+alt+1) is frozen and I can't interact with it at all. > > Are the host clocks on the two hosts very close (there are lots of > weird corner cases with mismatched clocks) - same time zone? Yep. Both machines are in the same room and have the clock sync'ed. > > Are you using cache=none (given that it's NFS shared) I wasn't. But I tried again with cache=none and I got exactly the same thing. Also, I tried with stable-2.2 branch and got the same behavior. I really think that's very unlikely to have unstable code of such an important feature upstream, or on a stable- branch. Most probable thing is that I have something wrong on my environment. Anyway, I'll keep tetsing different stable- branches until I find something that works for me. I'll keep the mailing list posted. Thanks for the light! -- Eduardo Otubo ProfitBricks GmbH
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