mkfs.btrfs -d raid5 -m raid5 -O raid56 /dev/RAID/MP3-1 /dev/RAID/MP3-2 /dev/RAID/MP3-3 /dev/RAID/MP3-4

Occupation des disques:

  btrfs fi df /home
  

Liste des disques:

  btrfs fi show
  Label: none  uuid: d03af97c-5df3-4653-8a1a-1a055b50f200
      Total devices 1 FS bytes used 35.42GiB
      devid    1 size 40.00GiB used 38.02GiB path /dev/mapper/RAID-VIDEO1
  Label: none  uuid: 233805cd-fbd3-46eb-847f-2a598db8a93a
      Total devices 4 FS bytes used 960.00KiB
      devid    1 size 10.00GiB used 1.12GiB path /dev/mapper/RAID-MP3--1
      devid    2 size 10.00GiB used 1.12GiB path /dev/mapper/RAID-MP3--2
      devid    3 size 10.00GiB used 1.12GiB path /dev/mapper/RAID-MP3--3
      devid    4 size 10.00GiB used 1.12GiB path /dev/mapper/RAID-MP3--4

Remonter le FS défaillant:

 mount -t btrfs -o recovery <device> <mount point>
 

Enlever le disque

  btrfs device delete missing <mount point>
  

Puis refaire le raid

  btrfs balance start <mount point>

Ou remplacer le disque:

  btrfs replace start -r <device source> <device dest> <mount point>