From owner-freebsd-stable Wed Oct 18 4:37:33 2000 Delivered-To: freebsd-stable@freebsd.org Received: from cs.huji.ac.il (cs.huji.ac.il [132.65.16.10]) by hub.freebsd.org (Postfix) with ESMTP id C9C7A37B657 for ; Wed, 18 Oct 2000 04:37:29 -0700 (PDT) Received: from sexta.cs.huji.ac.il ([132.65.16.13] ident=exim) by cs.huji.ac.il with esmtp (Exim 3.16 #1) id 13lrXC-0004BL-00; Wed, 18 Oct 2000 13:37:26 +0200 Received: from localhost ([127.0.0.1] helo=sexta.cs.huji.ac.il ident=danny) by sexta.cs.huji.ac.il with esmtp (Exim 3.15 #1) id 13lrXB-0002Xi-00; Wed, 18 Oct 2000 13:37:25 +0200 X-Mailer: exmh version 2.2 06/23/2000 with nmh-0.24 To: Gerhard Sittig Cc: freebsd-stable@FreeBSD.ORG Subject: Re: PERC2 RAID support in 4.1-STABLE In-reply-to: Your message of Tue, 17 Oct 2000 15:10:30 -0700 . Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Date: Wed, 18 Oct 2000 13:37:25 +0200 From: Danny Braniss Message-Id: Sender: owner-freebsd-stable@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.ORG 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