Date: Wed, 1 Jun 2005 18:22:00 +0100 From: "Steven Hartland" <killing@multiplay.co.uk> To: "Dan Nelson" <dnelson@allantgroup.com> Cc: freebsd-stable@freebsd.org Subject: Re: good performing SCSI RAID5 ( was: asr ( 2015S ) support in 5.4 amd64? ) Message-ID: <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>
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----- 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
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