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In-Reply-To: Message from Raymond Wiker <Raymond.Wiker@fast.no> 
	<16389.15817.322098.577889@raw.grenland.fast.no> 
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Date: Wed, 14 Jan 2004 10:11:08 -0500
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Subject: Re: Adaptect raid performance with FreeBSD 
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I think I heard Raymond Wiker say:
>Ari Suutari writes:
> > dd if=/dev/rda1s1a of=/dev/null bs=1m count=100
> > 100+0 records in
> > 100+0 records out
> > 104857600 bytes transferred in 4.193832 secs (25002814 bytes/sec)
> > 
> > So, I get only about 25MB/s. Shouldn't I be getting something
> > like 70 MB/s, or even more since there are two disks that
> > can server read requests ?


FWIW, on my mylex controller w/ raid 5 I'm getting:

# dd if=/dev/da0s1g of=/dev/null bs=1m count=100
100+0 records in
100+0 records out
104857600 bytes transferred in 3.707196 secs (28284882 bytes/sec)


and my dell perc3/dc (raid 5) is getting:

# dd if=/dev/amrd0s2e of=/dev/null bs=1m count=100
100+0 records in
100+0 records out
104857600 bytes transferred in 2.133522 secs (49147653 bytes/sec)


-matthew