From owner-freebsd-stable Wed May 29 7:14:19 2002 Delivered-To: freebsd-stable@freebsd.org Received: from magic.adaptec.com (magic.adaptec.com [208.236.45.80]) by hub.freebsd.org (Postfix) with ESMTP id 2FF1D37B40E; Wed, 29 May 2002 07:14:15 -0700 (PDT) Received: from redfish.adaptec.com (redfish.adaptec.com [162.62.50.11]) by magic.adaptec.com (8.10.2+Sun/8.10.2) with ESMTP id g4TEEEj17714; Wed, 29 May 2002 07:14:14 -0700 (PDT) Received: from btc.btc.adaptec.com (btc.btc.adaptec.com [10.100.0.52]) by redfish.adaptec.com (8.8.8+Sun/8.8.8) with ESMTP id HAA26185; Wed, 29 May 2002 07:14:13 -0700 (PDT) Received: from hollin.btc.adaptec.com (hollin [10.100.253.56]) by btc.btc.adaptec.com (8.8.8+Sun/8.8.8) with ESMTP id IAA05460; Wed, 29 May 2002 08:14:12 -0600 (MDT) Received: from hollin.btc.adaptec.com (localhost [127.0.0.1]) by hollin.btc.adaptec.com (8.12.3/8.12.3) with ESMTP id g4TEBgrP002295; Wed, 29 May 2002 08:11:42 -0600 (MDT) (envelope-from scottl@hollin.btc.adaptec.com) Received: (from scottl@localhost) by hollin.btc.adaptec.com (8.12.3/8.12.3/Submit) id g4TEBfCA002294; Wed, 29 May 2002 08:11:41 -0600 (MDT) Date: Wed, 29 May 2002 08:11:41 -0600 From: Scott Long To: "Greg 'groggy' Lehey" 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: <20020529141141.GC2262@hollin.btc.adaptec.com> References: <2C7CBDC6EA58D6119E4A00065B3A24CB04636E@btcexc01.btc.adaptec.com> <20020529134211.L82424@wantadilla.lemis.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20020529134211.L82424@wantadilla.lemis.com> User-Agent: Mutt/1.3.25i 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 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, and as such there is probably little I can say to convince you of my points. I think that we must then agree to disagree =-) Scott To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-stable" in the body of the message