If in a RAID array two HDDs or more fail / get an unhealthy status at the same time, there is the possibility that something might have gone wrong with the drivers of the controller or the controller itself. Fix the problem with the controller & try to restart the array with all the HDDs (e.g. a RAID 5 with 4 HDDs)...
...and check in "cat /proc/mdstat" if both the HDDs are still marked as "failed". If not, try to re-add the faulty HDD with...
Code:
mdadm --assemble --force /dev/md0 /dev/sda1 /dev/sdb1 /dev/sdc1 /dev/sdd1
Code:
mdadm --manage /dev/md0 --add /dev/sdd1
...or whichever HDD failed and see if the RAID rebuilds correctly and works again afterwards.
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