My apologies, I thought the references to /dev/zero, /dev/null and bs=65536 
made it clear I was using dd.

I increased the file size to 65 GB and reran the tests.  It turns out  the read 
operation wall time can vary by several minutes.  For the 6.5 GB test that 
makes the thoughput rather low.  On the 65 GB tests I got  42-59 MB/s read for 
10 trials.  This  is pretty much what I expect from gigabit using a cheap SOHO 
switch w/ no other traffic.

In summary, the N40L is giving me wire speed NFS R/W from a 4 disk RAIDZ2  pool 
for ~$0.25/GB.  Quite satisfactory.  The anomaly was an artifact of small file 
and sample size.   

Sorry about the unnecessary noise.

Reg






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