Creation

   1 # RAID 5 array creation
   2 sudo mdadm --create /dev/md5 --level=5 --raid-devices=3 /dev/sd[def]1
   3 
   4 # Create a high-performance RAID10 array (2x read speed compared to RAID1)
   5 sudo mdadm --create /dev/md6 --level=10 -p f2 --raid-devices=2 /dev/sd[ik]1

Diagnosis

Examine array component

Displays superblock information, including last event, RAID UUID, other components, etc. 

   1 mdadm --examine /dev/sda1

CategoryCheatSheet