Yeysy,   The best way for me to explain it is that Virtualization is used to maximize the use of the system , so a server at full potential isn't a warning situation, but exceeding it is.    Let me know if this helps.  
Hi: Anybody knows why by default all "Warning Threshold" settings in the iDRAC Performance section are set to 101%? Is not more accuracy to have it set it to 100%?   Thanks Yeysy
Why all "Warning Threshold" in the iDRAC Perfomance section are set to 101%