Helpful mdadm commands

• mdadm /dev/md0 --add /dev/sdX
• cat /proc/mdstat get overview of Raids in PC
• mdadm --detail /dev/md0 get more detailed view
• mdadm /dev/md0 --monitor --test --oneshot testing especially for sending mails
• blkid show all the ids of the hdds
• For repair on a Live CD the following commands:

  sudo mdadm --assemble --scan