Date: Wed, 18 Oct 2000 13:37:25 +0200 From: Danny Braniss <danny@cs.huji.ac.il> To: Gerhard Sittig <Gerhard.Sittig@gmx.net> Cc: freebsd-stable@FreeBSD.ORG Subject: Re: PERC2 RAID support in 4.1-STABLE Message-ID: <E13lrXB-0002Xi-00@sexta.cs.huji.ac.il> In-Reply-To: Your message of Tue, 17 Oct 2000 15:10:30 -0700 .
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In message <200010172210.e9HMAUh00566@mass.osd.bsdi.com>you write: }> > Its a shorter PCI card than the others, single channel, SCSI }> > LVD. It has OK performance. I am currently using it in a }> > RAID0+1 type config. I don't know how relevant this is but, i am evaluating a dell box with a 'Dell Perc 3/si' it has at the moment only 2 IBM drives, so I can only test raid0/1. the following numbers are from (my)memory, and for sequential writes: (numbers are in Megabytes / sec). single disk: raid turned off ~ 5 volume ~ 10/20 - speed increase with file size +write cache ~ 40/20 - speed decrease with file size doing raid0 (with 2 disks) does not change the picture much. at least with my test program :-). the first speed-up: have no idea - but maybe the 'i960RX 100MHz' steps in? the second speed-up: seems to come from the cache - in my case 62MB. cheers, danny To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-stable" in the body of the message
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