I had the same issue with the HP Build of 5.1 U1 & U2 with a Gen 8 DL360 & P2000 G3
After HP had replaced the mainboard & both the H221 HBAs it was traced to a driver fault (Applies to 5.0 as well)
http://h20566.www2.hp.com/portal/site/hpsc/template.PAGE/public/psi/swdDetails/?sp4ts.oid=5177954&sp...
