I have a 6-disk RAIDZ2 on an AMD64 system with 2GBRAM.  Using dd to read a 6GB 
file to /dev/null, I get rates ranging from 35MB/s to 80MB/s.  Worse, I see the 
disk activity light go out regularly for a few seconds at a time, and fsstats 
and iostats confirms the impression that there is basically no disk activity 
during this time.  The CPU is also nearly idle during these intervals.  WTF?
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