VM migrate fails while heavy I/O

Mar 19, 2016
9
0
21
Hello,
while testing i tried to do a live-migration of a VM while fio was running (read-test, 4k random, about 100k iops).

Migration stops here:
[......]
Jun 08 15:45:24 starting online/live migration on localhost:60000
Jun 08 15:45:24 migrate_set_speed: 8589934592
Jun 08 15:45:24 migrate_set_downtime: 0.1

After this i also get:
qm status 100

"unable to connect to VM 100 qmp socket - timeout after 31 retries"

VM seems to be frozen, after qm stop / qm start vm is fine again, and also migration works - at least when there is not heavy i/o.

Also, qm stop 100 shows this:

"VM quit/powerdown failed - terminating now with SIGTERM"

Any ideas ?
I could provide more output / logfiles if needed.

Alex