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Member since:
2007-07-27
As one of the engineers of ZFS explains it about the rampant layering violation:
http://blogs.sun.com/bonwick/entry/rampant_layering_violation
"Andrew Morton has famously called ZFS a "rampant layering violation" because it combines the functionality of a filesystem, volume manager, and RAID controller. I suppose it depends what the meaning of the word violate is. While designing ZFS we observed that the standard layering of the storage stack induces a surprising amount of unnecessary complexity and duplicated logic. We found that by refactoring the problem a bit -- that is, changing where the boundaries are between layers -- we could make the whole thing much simpler.
....
The ZFS architecture eliminates an entire layer of translation -- and along with it, an entire class of metadata (volume LBAs). It also eliminates the need for hardware RAID controllers. At the same time, it provides a useful new interface -- object storage -- that was previously inaccessible because it was buried inside a monolithic filesystem.
I certainly don't feel violated. Do you?"