Usual raid commands

Usual linux raid commands reminder :

• Create raid array :

mdadm --create /dev/mdx --level=1 --raid-devices=2 /dev/sda1 /dev/sdb1  

• Delete raid array

mdadm --stop /dev/mdx
mdadm --zero-superblock /dev/sda /dev/sdb

• Remove a disk from an array

mdadm --manage /dev/mdx --set-faulty /dev/sda1
mdadm --manage /dev/mdx --remove /dev/sda1  

• Add a disk to an array

  mdadm --manage /dev/mdx --add /dev/sda1

• Increase the raid array size if the replacing disks are bigger

  mdadm --grow /dev/mdx --size=max
  #increase the filesystem size for an ext4 filesystem
  resize2fs /dev/mdx
  #if btrfs
  btrfs filesystem resize max /dev/mdx

• Details about a raid array

cat /proc/mdstat
mdadm --detail /dev/mdx