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From: Wojciech Puchar <wojtek@wojtek.tensor.gdynia.pl>
To: "Steve O'Hara-Smith" <steve@sohara.org>
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	Sun, 05 Aug 2012 13:29:52 +0200 (CEST)
Cc: freebsd-questions@freebsd.org
Subject: Re: ZFS bonnie puzzlement
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> are showing me. Read performance OTOH is strange, zpool and systat both
> reporting consistently an aggregated read speed of around 120MB/s during
> the block read tests (which seems a bit slow for the drives - and indeed
> systat reports the drives at less than 50% utilisation) but bonnie is only
> reporting 35MB/s, I see similar discrepancies with simple dd block reads
> to /dev/null, in which case my stopwatch agrees with dd.
no it is not wrong.

Do more tests (possibly your own doing heavy mixed workload) to understand 
well why you should not use this "last word in filesystems".

Discover it alone. I told already enough about it but it results in 
attacks from ZFS (and general "new technology") fanatics.