From owner-freebsd-current Sun Jan 9 20:13:52 2000 Delivered-To: freebsd-current@freebsd.org Received: from mailext04.compaq.com (mailext04.compaq.com [207.18.199.42]) by hub.freebsd.org (Postfix) with ESMTP id CC96E15397 for ; Sun, 9 Jan 2000 20:13:37 -0800 (PST) (envelope-from grog@mojave.worldwide.lemis.com) Received: by mailext04.compaq.com (Postfix, from userid 12345) id BED3A104BBE; Sun, 9 Jan 2000 22:13:36 -0600 (CST) Received: from mailint11.im.hou.compaq.com (mailint11.compaq.com [207.18.199.189]) by mailext04.compaq.com (Postfix) with ESMTP id B9586FB101; Sun, 9 Jan 2000 22:13:36 -0600 (CST) Received: by mailint11.im.hou.compaq.com (Postfix, from userid 12345) id 714F255F02; Sun, 9 Jan 2000 22:13:29 -0600 (CST) Received: from mojave.worldwide.lemis.com (unknown [16.158.59.135]) by mailint11.im.hou.compaq.com (Postfix) with ESMTP id CE15252D01; Sun, 9 Jan 2000 22:13:27 -0600 (CST) Received: (from grog@localhost) by mojave.worldwide.lemis.com (8.9.3/8.9.3) id QAA00644; Sun, 9 Jan 2000 16:47:36 +0800 (SGT) (envelope-from grog) Date: Sun, 9 Jan 2000 16:47:36 +0800 From: Greg Lehey To: Brad Knowles Cc: Brad Chisholm , freebsd-current@FreeBSD.ORG Subject: RAID benchmarks (was: Adaptec AAC-364 RAID controller support) Message-ID: <20000109164735.B515@mojave.worldwide.lemis.com> Reply-To: Greg Lehey References: <200001072210.AA10196@newlgn49.unx.sas.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii X-Mailer: Mutt 1.0i In-Reply-To: ; from blk@skynet.be on Fri, Jan 07, 2000 at 11:33:20PM +0100 WWW-Home-Page: http://www.lemis.com/~grog X-PGP-Fingerprint: 6B 7B C3 8C 61 CD 54 AF 13 24 52 F8 6D A4 95 EF Organization: LEMIS, PO Box 460, Echunga SA 5153, Australia Phone: +61-8-8388-8286 Fax: +61-8-8388-8725 Mobile: +61-41-739-7062 Sender: owner-freebsd-current@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.ORG On Friday, 7 January 2000 at 23:33:20 +0100, Brad Knowles wrote: > At 5:10 PM -0500 2000/1/7, Brad Chisholm wrote: > >> The Adaptec card looks like it might provide a superior solution. What's >> best way to proceed when trying to get documentation support from vendors? > > Look long and hard at software solutions with vinum before you > wed yourself to a particular hardware RAID controller. At the very > least, I'd encourage you to extensively benchmark all the candidate > solutions in your environment, before you make a choice. > > You can see my own benchmarks that I've done so far at > . I hate to say this, but the results are meaningless for the sequential case; the version of rawio you used started all parallel sequential transfers at the same place, so the results showed primarily how much cache each device had. I've updated rawio and the port, and if you (anybody) are really interested in sequential performance, you should run the tests again. My take on this is that sequential performance is only interesting in a few unusual cases, such as streaming video, and the performance isn't nearly as good as you think as soon as you introduce more than one client process. Greg -- Finger grog@lemis.com for PGP public key See complete headers for address and phone numbers To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-current" in the body of the message