How to convert Debian Wheezy (or newer) system to btrfs
The new GRUB can handle the / boot partition in btrfs format, so now you do not need to have a separate partition formatted in ext2 / 3/4.
Further we assume that your entire file system is represented by one partition. If you have every partition under / usr /, / var, etc. create a separate partition then modify them separately, according to the instructions below.
So let's get started ...
1. Make a backup section. No one is responsible for the possible loss of data other than yourself!
2. Download and burn to a Debian Wheezy CD or USB stick (or newer).
3. Boot from the created boot image.
4.
5. Check if your favorite text editor is available (vim, ed, mine, etc.) and btrfs-tools, if not, then install them.
6.
7.
8. Mount the / proc, / dev, / sys partitions into / mnt:
9.
10. Edit / etc / fstab, find the line for the root partition (/) and change the UUID to a direct description of / dev / sdX, change the file system type from ext3 / ext4 to btrfs, remove the “extra” options by simply defaults, replace number 1 to 0.
11.
You should see a file like: initrd.img-3.1.0-1-686-pae.
The line after 'initrd.img-' is the version of the kernel that should be used further.
12.
13.
14.
15.
16. Unmount the / proc, / dev, / sys and / mnt sections into / mnt:
17. Overload and pray.
18. After a while, the system should boot up, enter 'mount' and make sure that it works on btrfs.
19. Execute:
If everything went well, you can safely delete the backup / ext2_saved that was created during the file system conversion process. We do it like this:
ps: Free translation of the article .
Further we assume that your entire file system is represented by one partition. If you have every partition under / usr /, / var, etc. create a separate partition then modify them separately, according to the instructions below.
So let's get started ...
1. Make a backup section. No one is responsible for the possible loss of data other than yourself!
2. Download and burn to a Debian Wheezy CD or USB stick (or newer).
3. Boot from the created boot image.
4.
fsck -f /dev/sdaX (where / dev / sdaX is the root partition)5. Check if your favorite text editor is available (vim, ed, mine, etc.) and btrfs-tools, if not, then install them.
6.
btrfs-convert /dev/sdX7.
mount /dev/sdX /mnt8. Mount the / proc, / dev, / sys partitions into / mnt:
mount -o bind /dev /mnt/devmount -o bind /sys /mnt/sysmount -o bind /proc /mnt/proc9.
chroot /mnt10. Edit / etc / fstab, find the line for the root partition (/) and change the UUID to a direct description of / dev / sdX, change the file system type from ext3 / ext4 to btrfs, remove the “extra” options by simply defaults, replace number 1 to 0.
11.
ls -la /bootYou should see a file like: initrd.img-3.1.0-1-686-pae.
The line after 'initrd.img-' is the version of the kernel that should be used further.
12.
mkinitramfs 3.1.0-1-686-pae -o /boot/initrd.img-3.1.0-1-686-pae13.
grub-install /dev/sdX14.
update-grub15.
exit (exit the chroot environment)16. Unmount the / proc, / dev, / sys and / mnt sections into / mnt:
umount /mnt/procumount /mnt/devumount /mnt/sysumount /mnt17. Overload and pray.
18. After a while, the system should boot up, enter 'mount' and make sure that it works on btrfs.
19. Execute:
update-initramfs -u -t -kallIf everything went well, you can safely delete the backup / ext2_saved that was created during the file system conversion process. We do it like this:
btrfs subvolume delete /ext2_savedps: Free translation of the article .
')
Source: https://habr.com/ru/post/139590/
All Articles