GNU/Linux Desktop Survival Guide by Graham Williams
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Convert Ext2 to Ext3

Converting from a standard ext2 disk format to a journalled ext3 format is easy, since it simply involves adding a journal file. It can be done while the system is running with:

  # tune2fs -j /dev/hda1

Then change ext2 to ext3 in /etc/fstab and unmount/mount for it to take effect. If /dev/hda1 is your root partition, then you'll need to reboot for it to take effect.