From owner-freebsd-stable Fri Oct 11 5:39: 6 2002 Delivered-To: freebsd-stable@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id DA71637B401 for ; Fri, 11 Oct 2002 05:39:04 -0700 (PDT) Received: from gate21.fw.porsche.de (gate23.fw.porsche.de [193.174.9.99]) by mx1.FreeBSD.org (Postfix) with SMTP id B0E8A43EAC for ; Fri, 11 Oct 2002 05:39:00 -0700 (PDT) (envelope-from perisa@porsche.de) Received: (qmail 24019 invoked from network); 11 Oct 2002 12:46:28 -0000 Received: from unknown (HELO wuxin011.ibd.porsche.de) (141.36.65.1) by 193.197.149.150 with SMTP; 11 Oct 2002 12:46:28 -0000 Received: (qmail 24941 invoked from network); 11 Oct 2002 12:38:55 -0000 Received: from beastie.ibd.porsche.de (HELO porsche.de) (141.36.3.29) by smtp4cli.ibd.porsche.de with SMTP; 11 Oct 2002 12:38:55 -0000 Message-ID: <3DA6C81B.9000102@porsche.de> Date: Fri, 11 Oct 2002 14:46:19 +0200 From: Marc Perisa User-Agent: Mozilla/5.0 (X11; U; FreeBSD i386; en-US; rv:1.0.0) Gecko/20020709 X-Accept-Language: en, de-de, es-es MIME-Version: 1.0 To: Lasse Laursen Cc: freebsd-stable@freebsd.org Subject: Re: Raid-1 and Vinum References: <020d01c27120$47746de0$1a01000a@area51> Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit 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 Lasse Laursen wrote: > Hi all, > > I have a small question regarding Vinum and Raid-1 that I hoped someone > would be able to answer. > > We have a storagetak raid with 2 x 65 GByte RAID 5 arrays. We are going to > mount both arrays under FreeBSD and then use software raid 1 (Vinum) to > mirror the two raids (It's a single point of failure in a huge cluster so > it's really important to never loose any data). > > We have several Linux systems running software raid 1 and if one of the > disks fail in the mirror then the other disk can simply be mounted - is it > the same procedure under FreeBSD? Eg. if one of the raids fail we will be > able to mount the existing part of the raid as a regular disk? > > (please reply to my email address as well as to the list) > > Thanks in advance :) > > > Regards > Hi Lars, as far as I understand Vinum you don't have to mount another disk to use the mirror. It works as follows: define a mirrored RAID using Vinum mount that mirrored RAID write data to it If one mirror fails (in your case: your RAID-5 looses 2 disks at once) Vinum will set that "device" (your array) to failed and continue operations with a "degraded" RAID-1. No (re-)mounting needed. (Now stuff learned from looking while someone else has done it - not from own experience:) If you bring that RAID-5 back online, you tell Vinum to bring that back online (I think you have to fiddle through disk, subdisk and plex config) and continue operations. Hope that helps Marc To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-stable" in the body of the message