2

After upgrading a Debian system from 5.0 to 6.0 (Lenny to Sqeeze), how do I go about upgrading the root filesystem (which in this case is also boot) from ext3 to ext4?

5

This was no big deal at all, here's what I did:

  1. Edit /etc/fstab, replacing "ext3" with "ext4" for my root filesystem. (I also removed "barrier=1", which is now the default on ext4.)
  2. Reboot into single user mode with read only root filesystem.
  3. Run tune2fs -O extents,uninit_bg,dir_index /dev/DEV
  4. Reboot, again into single user mode with read only root filesystem. (Observe some mount warnings.)
  5. Run e2fsck -fDC0 /dev/DEV to patch up the filesystem.
  6. Reboot normally.

Most of this was taken from here.

0

additionaly to pauldoo's answer

  1. you might need to add rootfstype=ext4 to kernel boot options
  2. if you've converted a fairly old ext2 to ext4, it might be lacking online resize capability with the only solution - create new ext4 fs and then move your files there (sad, but true)
  3. if you've converted a fairly old ext2 to ext4, you might notice a .journal file at the root. it does not appear on other mount points, since fsck -f hides it automatically. Sadly it canot do the same to / mount point - you need live cd or any other running system to hide this .journal node

PS still actual for wheezy

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.