On a more prosaic note: not sure if Ceph addresses this, but anything that can fix the multi-hour fsck's required (for shared hosting and VPS providers on ext3) after a power cut would be very beneficial.
At least <a href="http://thunk.org/tytso/blog/2008/08/08/fast-ext4-fsck-times/">ext4 fsck is faster</a>...
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