Hello, I'm in 4.4.3 and CentOS 8.3 with 3 hosts. I have a high performance VM that is running on ov300 and is configured to be run on any host. It seems that both if I set or not the option Migrate only to hosts with the same TSC frequency I always am unable to migrate the VM and inside engine.log I see this: 2020-12-11 15:56:03,424+01 INFO [org.ovirt.engine.core.bll.scheduling.SchedulingManager] (default task-36) [e4801b28-c832-4474-aa53-4ebfd7c6e2d0] Candidate host 'ov301' ('382bfc8f-60d5-4e06-8571-7dae1700574d') was filtered out by 'VAR__FILTERTYPE__INTERNAL' filter 'Migration-Tsc-Frequency' (correlation id: null) 2020-12-11 15:56:03,424+01 INFO [org.ovirt.engine.core.bll.scheduling.SchedulingManager] (default task-36) [e4801b28-c832-4474-aa53-4ebfd7c6e2d0] Candidate host 'ov200' ('949d0087-2c24-4759-8427-f9eade1dd2cc') was filtered out by 'VAR__FILTERTYPE__INTERNAL' filter 'Migration-Tsc-Frequency' (correlation id: null) Can you verify if it is only my problem? Apart from the problem itself, what is "TSC frequency" and how can I check if my 3 hosts are different or not indeed? Normal VMs are able to migrate without problems Thanks, Gianluca