there is a utility for defragging ext2 though it is hardly worth the trouble of running. It used to make big performance gains for ext
ext3 is like ext2--it keeps fragmentation very low by nature and by design. Reiserfs should never be defragged--the elaborate tree structure it sets up is already basically optimized and you have a choice between space opt (default) and speed opt (notails mount). JFS is equipped with a defragger. It would be the fastest of filesystems if you did not have to count in the time spent defragging. XFS is very fast except when you massively delete files. Want to hazard a guess why? Civileme
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