From owner-freebsd-stable Mon May 27 17:26:56 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 6CFD237B403 for ; Mon, 27 May 2002 17:26:51 -0700 (PDT) Received: by wantadilla.lemis.com (Postfix, from userid 1004) id 9CE3E8148E; Tue, 28 May 2002 09:56:49 +0930 (CST) Date: Tue, 28 May 2002 09:56:49 +0930 From: Greg 'groggy' Lehey To: Miguel Mendez Cc: Cy Schubert - CITS Open Systems Group , Kirk Strauser , freebsd-stable@FreeBSD.ORG Subject: Re: Hardware RAID vs vinum Message-ID: <20020528095649.B16567@wantadilla.lemis.com> References: <200205271302.g4RD2Nr1099239@cwsys.cwsent.com> <20020527153552.A72342@energyhq.homeip.net> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20020527153552.A72342@energyhq.homeip.net> 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 15:35:52 +0200, 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 think vinum is, essentially, a Volume > Manager clone, with it's own enhancements, so I'd expect a simillar > behaviour of both programs. Agreed. I have trouble with this statement too. > OTOH, and don't quote me on this because it's been almost 2 years > since I last used VxVM, there's a way to gather cpu/system resources > usage with some tools that come with Volume Manager. > > I agree that having hardware RAID in a box that is running a > Database will improve performance noticeably. I don't think you can say that in all cases. It depends a lot on what you're comparing. 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