Date: Wed, 01 Jun 2005 11:25:08 -0600 From: Scott Long <scottl@samsco.org> To: Steven Hartland <killing@multiplay.co.uk> Cc: freebsd-stable@freebsd.org, Dan Nelson <dnelson@allantgroup.com> Subject: Re: good performing SCSI RAID5 ( was: asr ( 2015S ) support in 5.4 amd64? ) Message-ID: <429DEF74.20901@samsco.org> In-Reply-To: <007a01c566ce$6e3fd3a0$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> <20050601162914.GD90259@dan.emsphone.com> <007a01c566ce$6e3fd3a0$b3db87d4@multiplay.co.uk>
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Steven Hartland wrote: > ----- Original Message ----- From: "Dan Nelson" <dnelson@allantgroup.com> > >> 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. > > > Stated max seq read on the drives ( Maxtor 10k IV's ) is 89MB/s > where as the Seagate SATA's its 65MB/s so its a noticeable difference. > For the RAID to only give 27->33MB/s ( still testing stripe sizes ) is > disappointing to say the least, especially considering I have the SATA > RAID giving me 200MB/s. > > Steve > The ASR 370F firmware brought performance from 'abysmal' to 'slightly tolerable'. Under ideal conditions, it has been benchmarked to get close to 170MB/s, but you need to be very careful about stripe alignment and cache settings. Oh, and that was RAID-0, not RAID-5. Scott
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