> BTW, I think that a filesystem that span over multiple devices could make
> better choices than raid, right?
no, RAID is really a different concept, and it's filesystem independent.
multi-device filesystems _might_ be useful but the cleanest way of
handling striping and/or redundancy is IMO MD at the block device layer.
Caching and block allocation decisions are best done on the filesystem
level.
-- mingo
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