Comment by dekhn

I've been promised many things by vendors and they always fall back to "hey! look! cool CS file system theory". I test my systems carefully and report the results back; they often don't agree.

I should point out again that I don't have enough direct experience with ZFS to say if this is the case, my experience was with an enterprise NetApp server at a large company that was filling the disk up (>95%) in addition to doing hourly snapshots.