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Ext3 is an extension of the [Ext2] filesystem, currently adding journalling support. To turn your [Ext2] file systems into Ext3 file systems run the command: tune2fs -j /dev/''partition'' or tune2fs -j -J ''[[options]'' /dev/''partition'' where the only journal option currently supported is __-J size=xMB__. See tune2fs(8) for min/max size. Note that unlike most disk tool commands, you add the journal to a currently mounted partition. Also remember to change fstab(5) to mount the partition as Ext3, and then unmount/remount it or reboot. (You do not have to do this immediately). You can always mount an ext3 partition as type ext2 -- you just will not have any journalling performed. Ext3 is also gaining some features such as Extents (which reduces the amount of overhead with storing where a file is stored on the disk for large files), and hash based lookups on Directories solving the problem ext2 has with large directories being very slow.
10 pages link to
Ext3
:
KnoppixNotes
BootLoader
FileSystemsComparison
PartitioningSuggestions
PgBench
FileSystem
Ext2
DiskCluster
QuestionsFromWindowsUsers
Ext4