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Most mainstream filesystems can be grown fairly reliably, but what if I think I would like to shrink in future?

XFS is a non runner. Reiser seems to have good support but gives scary BETA warnings , it works really fast though. Btrfs seems to promise good things but I've no experience with it.

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up vote 3 down vote accepted

resize2fs is able to both grow and shrink ext2/ext3/ext4 filesystems.

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Is it also considered reliable ? –  barrymac Oct 31 '11 at 22:23
    
@barrymac it is reliable, you can even resize the ext3/ext4 filesystem online (as long as your kernel support it, which is almost sure to be). –  Hanan N. Nov 27 '11 at 22:22
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