So I had an issue trying to upgrade from ESXi 5.5 to 6.0, for some reason the upgrade process would not recognize the RAID 1 that ESXi was installed, after looking around I realized that the HP Smart Array firmware was on 3.x so I loaded the HP SPP which upgraded the firmware to 6.x, and viola, drive showed up during the upgrade process. Lesson here, keep your servers firmware up to date.