upgrading ext3 to ext4 filesystem
The following commands upgrade an existing umounted ext3 filesystem to ext4 without having to reformat:
To upgrade the root partition, change /etc/fstab so that it will be mounted as ext4 (since ext4 can mount an ext3 file system), then reboot as single user read-only (recovery mode). Then after setting the tune2fs parameters, reboot again before running e2fsck. Then reboot normally.
tune2fs -O extents,uninit_bg,dir_index /dev/partition e2fsck -fDC0 /dev/partition
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