The system was working fine when suddenly the drives were no longer available. Upon further inspection I found that the SAS Fault LED was lit on the RAID card and the megaraid software no longer show when booting up the system. The RAID card in use is AOC-S3108L-H8iR but the user manual is of no real help. The only thing it says is
Red: On | SAS Error(s) detected
I've already tried to move the card to a different PCIe slot and to change the cables but even with nothing connected the led keeps burning and the software stays unavailable.