For what it's worth I just ran across this problem and found a solution. I had two drives in a mirror for the OS and six to create another VMFS datastore. Updating the driver/firmware did not help. If I pulled the six drives it would boot. I then put the six drives back in and deleted the logical volume and voila. Evidently these repurposed drives had data on them that ESXi could not deal with. I recreated the logical volume in RAID50 instead of 5 and all is well.
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