The software described in this documentation is either in Extended Support or Sustaining Support. See https://www.oracle.com/us/support/library/enterprise-linux-support-policies-069172.pdf for more information.
Oracle recommends that you upgrade the software described by this documentation as soon as possible.
You can use the btrfs-convert utility to
convert an ext2, ext3, or
ext4 file system to btrfs.
The utility preserves an image of the original file system in a
snapshot named ext2_saved. This snapshot allows
you to roll back the conversion, even if you have made changes to
the btrfs file system.
If you convert the root file system to btrfs, you can use snapshots to roll back changes such as upgrades that you have made to the file system.
You cannot convert a bootable partition, such as
/boot, to a btrfs file system.