Be very carefull when rebuilding a RAID set. We have seen if a drive fails after a few years of use, the other drives are also at risk. This means, when you rebuild, there is a higher chance another ...
First install smarttools: sudo apt-get install smartmontools To find out which drive you want investigate, use: df You will see info like /dev/sda /dev/sdb /dev/nvme0 Need more info, then use: lshw -c...