From owner-freebsd-stable Mon May 27 17:27:42 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 015EF37B403 for ; Mon, 27 May 2002 17:27:36 -0700 (PDT) Received: by wantadilla.lemis.com (Postfix, from userid 1004) id F3CC581473; Tue, 28 May 2002 09:57:33 +0930 (CST) Date: Tue, 28 May 2002 09:57:33 +0930 From: Greg 'groggy' Lehey To: Tod McQuillin Cc: Miguel Mendez , Cy Schubert - CITS Open Systems Group , Kirk Strauser , freebsd-stable@FreeBSD.ORG Subject: Re: Hardware RAID vs vinum Message-ID: <20020528095733.C16567@wantadilla.lemis.com> References: <20020527153552.A72342@energyhq.homeip.net> <20020527224614.V424-100000@glass.pun-pun.prv> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20020527224614.V424-100000@glass.pun-pun.prv> 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 Monday, 27 May 2002 at 22:48:54 +0900, Tod McQuillin wrote: > On Mon, 27 May 2002, Miguel Mendez wrote: > >> On Mon, May 27, 2002 at 06:02:23AM -0700, Cy Schubert - CITS Open Systems Group wrote: >> >>> Did we see a difference in CPU utilization? No. However ODS and VxVM >>> run below the kernel and cannot be measured by vmstat or sar, which is >>> different to how vinum works because it is part of the kernel. >> >> I feel curious about this. Both ODS and VxVM are just kernel modules >> that sit between hardware and the VFS layer if I'm not mistaken. What >> makes them different than vinum? > > I don't have experience with vinum, but we also experienced terrible > performance with Sun's ODS and software RAID-5. We didn't notice similar > problams with Veritas volume manager. > > I'm beginning to think it's peculiar to ODS, and that other software > RAID-5 implementations probably work a lot better. This makes more sense to me. 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