root@lib28:~# echo 'info migrate' |  /usr/bin/socat STDIO UNIX-CONNECT:/var/run/ganeti/kvm-hypervisor/ctrl/theta.ffzg.hr.monitor | grep dirty
dirty sync count: 1526
dirty pages rate: 32512 pages

It never ends

Useful hints are at https://github.com/ganeti/ganeti/issues/950

root@lib28:~# echo 'migrate_cancel' |  /usr/bin/socat STDIO UNIX-CONNECT:/var/run/ganeti/kvm-hypervisor/ctrl/theta.ffzg.hr.monitor | grep dirty
root@lib28:~# echo 'info migrate' |  /usr/bin/socat STDIO UNIX-CONNECT:/var/run/ganeti/kvm-hypervisor/ctrl/theta.ffzg.hr.monitor | grep dirty

ok, it stopped.

root@lib26:/home/dpavlin/instances# gnt-instance modify -H migration_downtime=2000 theta
Modified instance theta
 - hv/migration_downtime -> 2000

Ensure that kvm is correctly configured:

gnt-cluster modify -H kvm:migration_caps=xbzrle:auto-converge:zero-blocks