From owner-freebsd-stable Mon May 27 6:50:30 2002 Delivered-To: freebsd-stable@freebsd.org Received: from glass.dnsart.com (203.141.139.231.user.ad.il24.net [203.141.139.231]) by hub.freebsd.org (Postfix) with ESMTP id 8BE7B37B403 for ; Mon, 27 May 2002 06:50:25 -0700 (PDT) Received: from localhost ([127.0.0.1]) by glass.dnsart.com with esmtp (Exim 3.36 #1) id 17CKrw-0004Jq-00; Mon, 27 May 2002 22:49:04 +0900 Date: Mon, 27 May 2002 22:48:54 +0900 (JST) From: Tod McQuillin X-X-Sender: devin@glass.pun-pun.prv To: Miguel Mendez Cc: Cy Schubert - CITS Open Systems Group , Kirk Strauser , Subject: Re: Hardware RAID vs vinum In-Reply-To: <20020527153552.A72342@energyhq.homeip.net> Message-ID: <20020527224614.V424-100000@glass.pun-pun.prv> MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII 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 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. -- Tod McQuillin To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-stable" in the body of the message