Thank you very much Semi. The reinstallation would not be an problem, being the fact that i've spent so much in sorting this issue.
I don't understant the "setup a blacklist part" . What does this mean, how should I do it ?
I have looked over the other oVirt nodes that I have in the network, and the mpath is active on their rootfs as well.
I have used the 4.2-2018052606.iso image for instalation for cluster nodes and for single instance too.
Would it be possible to have a bug in this version ?
What iso should I use just to be sure everything will work good ?
Again, thank you very much !