Date: Wed, 1 Jun 2005 11:29:14 -0500 From: Dan Nelson <dnelson@allantgroup.com> To: Steven Hartland <killing@multiplay.co.uk> Cc: freebsd-stable@freebsd.org Subject: Re: good performing SCSI RAID5 ( was: asr ( 2015S ) support in 5.4 amd64? ) Message-ID: <20050601162914.GD90259@dan.emsphone.com> In-Reply-To: <00b901c566bd$d48f2450$b3db87d4@multiplay.co.uk> References: <006201c56633$5bc48c20$b3db87d4@multiplay.co.uk> <20050531233612.GD20906@tigerfish2.my.domain> <429D0C65.6010308@alumni.rice.edu> <003401c56696$0858c4d0$b3db87d4@multiplay.co.uk> <20050601150754.GE20906@tigerfish2.my.domain> <00b901c566bd$d48f2450$b3db87d4@multiplay.co.uk>
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In the last episode (Jun 01), Steven Hartland said: > Thanks for that Bruce I'm quite surprised that these numbers are so > low after playing with a cheapo hightech SATA controller which with > the help of the guys on the list I was able to give out 200MB/s I > really would expect the relatively expensive SCSI controllers to do > significantly better especially as they have superior disks attached > ( 10K vs 7k2 ) and not performance which is well below ( 1/2 ) that > expected of a single disk. The faster rpms will get you more concurrent I/Os per second but won't do as much for throughput. My asr 3200S cards got repurposed before I could try them with 5.x, but with the 370F firmware I'm pretty sure I was able to get more than 40MB/sec reads out of them on 4.x with 4-disk RAID5 sets. Since the asr driver needs Giant, try a UP kernel and see if it goes any faster. -- Dan Nelson dnelson@allantgroup.com
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