Degraded Array. RAID 6 with three disk failure
As said before, if more than two disks in a RAID-6 array die, the array is unrecoverable. However, three simultaneous disk failures are quite an unlikely event: it might very well be a case of a faulty enclosure, backplane and/or controller. You should try removing and re-inserting the disks, replacing the controller and/or the enclosure, … Read more