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What is your main use case? What is your choice instead of ext*?

I like write-anywhere/COW filesystems.

Unfortunately the open source ones kinda blow due to interesting performance penalties (I'm looking at you, btrfs back ref management) or crazy memory usage/non-extent based systems/read-modify-write induced mania (I'm looking at you, ZFS block tree)

What non-open source ones do you like, then?

Oh, you've probably never heard of them.

I've been playing with btrfs under the 3.7 prerelease kernel on an arch kvm with a virtio disks, and with lzo compression btrfs is kicking some serious read / write butt vs every other major filesystem I can think of. Given sufficient hardware, of course. Haven't tried it on an ssd though, only on 7200rpm turnstables.

I still use reiserfs for all my linux machines (ext2 for /boot); ZFS on freebsd. I haven't experienced the corruption I've seen under ext3 with either of them.

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