meta data for this page
  •  
Book Creator
 Add this page to your book
Book Creator
 Remove this page from your book  

 Manage book(0 page(s))
 Help

This is an old revision of the document!

BTRFS as root filesystem

System overview

  1. /dev/sda1 4.08GB ext4 “/” used 1.56GB, free 2.53GB
  2. /dev/sda2 10.91GB extended
    1. /dev/sda5 524MB swap
    2. /dev/sda6 10.40GB ext4 “/home” 321MB used, 10.09GB free

Boot from live-cd

Btrfs support is heavily developed in Linux Kernel. So do not use old kernel.

I was using gparted-live-0.22.0-1-amd64.iso (NOTE: to match your existing system architecture (i586, amd64, etc)) Which contains:

  1. Kernel 3.16.0-4-586
  2. btrfs utils version 3.17

Conversion

fsck -f /dev/sda1
fsck -f /dev/sda6
 
btrfs-convert /dev/sda1
Disk usage before conversion: used 1.56GB, free 2.53GB
after conversion: used 1.65GB, free 2.43GB
btrfs check /dev/sda1

Update system

Mount new root filesystem: 

mount /dev/sda1 /mnt
for i in dev dev/pts proc sys ; do mount --bind /$i /mnt/$i ; done
chroot /mnt

get new UUID of /dev/sda1 using “blkid” mount /dev/sda1 somewhere, go to etc/fstab and update to new UUID: 

UUID=a74f5787-aee1-4981-b7e6-fbd3cb6ac919 /               btrfs    defaults 0       1
update-grub
grub-install /dev/sda
 
exit
 
reboot

and remove Live CD with Gparted

rollback to ext FS

Rollback to ext2 is possible. There is subvolume ext2_saved on filesystem. 

btrfs subvolume list /

To delete backup 

btrfs subvolume delete /ext2_saved