I'm not using as huge a dataset, but I was seeing this behavior as well when
I first set my box up. What was happening was that ZFS was caching *lots* of
writes, and then would dump them all to disk at once, during which time the
computer was completely occupied with the disk I/O.
The solution (suggested from <http://wiki.freebsd.org/ZFSTuningGuide>) for me
was:
vfs.zfs.txg.timeout="5"
both problem, and solution is very close to linux style ext2/3/4 and it's
behaviour. And one of the main reason to moving out from this s..t to
FreeBSD. (the other was networking)
UFS writes out complete MAXBSIZE sized chunks quickly.
all of that behaviour or linux (and probably ZFS) are because it often
gives better result in benchmark, and people love synthetic benchmarks.
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