Finally, I end Up installing ProxMox on the Server. Last version, It looks like perfect for the moment.   I was planning to use OpenStack, but this is just OK for me.
Dear all:     For some reason, I can't boot the Dell R620 from USB RHES 79 Server. Apparently, It is certified for that OS, but there is no way to install the system. I have the log file, apparently is related to RAID system. Thankd  
Dell R620 on RHEL79