I have a DL380 G5 P400 controller with 8 147gb drives in a raid 6 array (1 hot spare). I am upgrading to ESXI 5.1. I noticed that drives 5,6,7,8 had no lights on them but were running perfectly. The drive leds on the back plane are working as all drive lights cycle thru blue,green,orange,red as the system starts powering up. I deleted the complete array and recreated it, loaded ESXI 5.1 and now only drives 1,2,3 have lights on all others are off. ESXI reports all drives are healthy and running fine. I pulled drive 7 and immediately the array lit the green light on drive 4 (spare drive) and began rebuilding.