From owner-freebsd-stable Wed May 29 16:32:58 2002 Delivered-To: freebsd-stable@freebsd.org Received: from wantadilla.lemis.com (wantadilla.lemis.com [192.109.197.80]) by hub.freebsd.org (Postfix) with ESMTP id 4BBFA37B400 for ; Wed, 29 May 2002 16:32:50 -0700 (PDT) Received: by wantadilla.lemis.com (Postfix, from userid 1004) id 115F48133C; Thu, 30 May 2002 09:02:47 +0930 (CST) Date: Thu, 30 May 2002 09:02:47 +0930 From: Greg 'groggy' Lehey To: Scott Long Cc: Scott Long , Doug White , Cy Schubert - CITS Open Systems Group , Kirk Strauser , freebsd-stable@freebsd.org Subject: Re: Hardware RAID vs vinum Message-ID: <20020530090247.Y82424@wantadilla.lemis.com> References: <2C7CBDC6EA58D6119E4A00065B3A24CB04636E@btcexc01.btc.adaptec.com> <20020529134211.L82424@wantadilla.lemis.com> <20020529141141.GC2262@hollin.btc.adaptec.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20020529141141.GC2262@hollin.btc.adaptec.com> User-Agent: Mutt/1.3.23i Organization: The FreeBSD Project Phone: +61-8-8388-8286 Fax: +61-8-8388-8725 Mobile: +61-418-838-708 WWW-Home-Page: http://www.FreeBSD.org/ X-PGP-Fingerprint: 9A1B 8202 BCCE B846 F92F 09AC 22E6 F290 507A 4223 Sender: owner-freebsd-stable@FreeBSD.ORG Precedence: bulk List-ID: List-Archive: (Web Archive) List-Help: (List Instructions) List-Subscribe: List-Unsubscribe: X-Loop: FreeBSD.ORG On Wednesday, 29 May 2002 at 8:11:41 -0600, Scott Long wrote: > On Wed, May 29, 2002 at 01:42:11PM +0930, Greg 'groggy' Lehey wrote: >> >> I'm sure that there are good reasons for small stripe sizes. I don't >> believe that efficiency is one of them. I think your problem is that >> you're looking at single-request latency. That's usually not an >> issue, though it may impact copy performance. As I said, though, >> that's not usually where you would use RAID-5. The real issue is not >> so much latency as throughput. I hope I've been able to make it more >> understandable. > > Greg, > > It is obvious that I have tread onto religious territory here, Not for me. I've given you some very detailed arguments. I also have measurements which back them up. > and as such there is probably little I can say to convince you of my > points. Well, you could start by trying. > I think that we must then agree to disagree =-) I'd much rather see some technical arguments from you. Greg -- See complete headers for address and phone numbers To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-stable" in the body of the message