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From: Julien Cigar <jcigar@ulb.ac.be>
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Date: Fri, 27 Feb 2009 14:14:49 +0100
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Subject: poor performances with Intel Raid Controller (iir)
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Hello,

I've a machine with an integrated Intel RAID controller (U320) which
uses the iir driver. I have two arrays, one RAID 1 with two disks and
one RAID 5 with 8 disks. The disks are all Seagate 320MB/s. The system
is running FreeBSD 7.0-RELEASE with 8 processors (2,40 Ghz) and 4GB or
RAM.

I have very poor performances, around ~50 MB/s, is it normal ? 

jcigar@bccm-it ~ % dd if=/dev/zero of=blah bs=10M count=100
100+0 records in
100+0 records out
1048576000 bytes transferred in 20.168689 secs (51990290 bytes/sec)

Are there any tool to detect what could be the bottleneck(s) ?

Thanks,
Julien

-- 
Julien Cigar
Belgian Biodiversity Platform
http://www.biodiversity.be
Université Libre de Bruxelles (ULB)
Campus de la Plaine CP 257
Bâtiment NO, Bureau 4 N4 115C (Niveau 4)
Boulevard du Triomphe, entrée ULB 2
B-1050 Bruxelles
Mail: jcigar@ulb.ac.be
@biobel: http://biobel.biodiversity.be/person/show/471
Tel : 02 650 57 52