Date: Fri, 27 Feb 2009 15:37:59 +0100 (CET) From: Wojciech Puchar <wojtek@wojtek.tensor.gdynia.pl> To: Julien Cigar <jcigar@ulb.ac.be> Cc: freebsd-questions@freebsd.org Subject: Re: poor performances with Intel Raid Controller (iir) Message-ID: <alpine.BSF.2.00.0902271537070.20505@wojtek.tensor.gdynia.pl> In-Reply-To: <1235740489.2747.17.camel@frodon.be-bif.ulb.ac.be> References: <1235740489.2747.17.camel@frodon.be-bif.ulb.ac.be>
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> > 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) ? are you sure it isn't NORMAL performance of this card. i think it is, the "hardware" RAID solutions are usually much slower than software, even more with RAID5.
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