In the engine.log, there are many line like that : grep '2016-08-03 13:00:46,371 INFO .org.ovirt.engine.core.vdsbroker.HostDevListByCapsVDSCommand. .org.ovirt.thread.pool-8-thread-16. .28054a0c. ' /var/log/ovirt-engine/engine.log | wc 1 8574 179635 1 line 8574 words 179635 characters. And at the INFO level. It's almost impossible to check logs with line like that. They should be : 1/at trace level 2/send to a dedicated file 3/don't be logged at all.