Dis you enable libgfapi ?
engine-config -s LibgfApiSupported=true

Note: power off and then power on the VM. The qemu process should not use the '/rhev' mountpoints.

Also, share your current setup:
- disks
- hw controller
- did you storage align your block devices (hw raid only)
- tuned-profile
- sysctl settings that are changed
- gluster volume options that are changed

Best Regards,
Strahil Nikolov