I have a PowerEdge 610 with a Perc 6/i that is booting up to the error "No boot device available" after a power outage. When the server boots, it loads the controller and sees the Virtual Disk 0 and it initializes 100% then posts that error. I have checked the RAID controller and it reports no errors, all discs are online and the Virtual Disk is in Optimal condition. Virtual Disk 0 is set in the controller as a Bootable Disk. I pulled a drive just to make sure the controller was actually reporting correct data and it recognized the removal and then started to rebuild the drive when I put it back in.
THere are 4 drives in the server in a RAID 10 array. On it we are running ESXi with a couple Windows hosts.