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From: "Artem Kuchin" <matrix@itlegion.ru>
To: <freebsd-stable@freebsd.org>,
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Date: Wed, 7 Mar 2007 22:29:42 +0300
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Cc: freebsd-geom@freebsd.org
Subject: Re: Some Unix benchmarks for those who are interesed
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>>Artem Kuchin wrote:
>> Hmm. what kind of HDD, RAID or whatever are you using?
>> My raid pretty much sucks. It is build it on the intel motherboard
>> LSI Megaraid. But i still get 81Mb/sec when doing
>> dd if=/dev/ar0 of=/dev/null bs=1M
>> 
>> How much do you get on this?
>
>geom_mirror on 2 desktop SATA drives, but the results of dd are pretty low:
>
># dd if=/dev/mirror/data of=/dev/null bs=1m count=1000
>1000+0 records in
>1000+0 records out
>1048576000 bytes transferred in 17.817686 secs (58850290 bytes/sec)
>
>As you can see, results with a single drive are better:
>
># dd if=/dev/ad4 of=/dev/null bs=1m count=1000
>1000+0 records in
>1000+0 records out
>1048576000 bytes transferred in 16.219518 secs (64649023 bytes/sec)

Now i am lost. i get 81MB/sec on dd but still you get

File Copy 1024 bufsize 2000 maxblocks         3960.0   159513.0      402.8

and i get

File Copy 1024 bufsize 2000 maxblocks         3960.0   109313.0      276.0

The drives i use are Seagate 7200.10 (320Gb, SATA II, 16MB cache
with perpendicular heads)

How is it possible that you get 2x file copy perfomance ? 
What's the matter?!

--
Artem