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I need a fast and space eficient filesystem for my Gentoo workstation.

I have some expirience with ext4 and found it very slow on lots of small files inside the filesystem. I am considering another filesystem, but don't know what to use: suggestions?

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"Root FS" alone is quite non-descriptive term since it's unclear will you use another mountpoints and what/where are they.

So, in common — quite space efficient is Btrfs with compress=lzo (or even compress-force=), and it was mine recent choice for root FS, but mine root FS is read-onlymostly since I've separate FSes for, say, /home (EXT4) and torrent storage (which used to be XFS, but now is also Btrfs, BTW).

In despite of what your choice would be I strongly encourage you to use LVM-2 since it'd give you flexibility with all those FSes you come along. ;-)

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+1 for using LVM. –  Renan Apr 8 '12 at 4:18
    
currently i have separated partitions for home and kvm images storage, i have tried also btrfs, but it degraded veary quickly (after formatting few days it worked really fast, faster than everything, but it "died" in week to ugly state), i using lvm, but now trying raid0 via mdadm instead of lvm (for home fs), works fine, currently i trying jfs for root, i will reply about results in few days –  sss123next Apr 8 '12 at 12:36
    
btrfs filesystem defragment to make it alive again? :) LVM is logical volume manager and MD is a block device for it — they're for different purposes and meanwhile these purposes can slightly overlap, you'd better use both since MD has not functions of LVM. –  poige Apr 9 '12 at 3:40
    
jfs still works fine after week, i have made few portage syncs, rebuilded (completely removed and copied kernel sources), and made big system upgrade (replace many files) –  sss123next Apr 16 '12 at 3:28
    
@sss123next, jfs is the slowest one. –  poige Apr 16 '12 at 3:49
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