From owner-freebsd-stable Fri Oct 11 17:37: 7 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 54DB237B401; Fri, 11 Oct 2002 17:37:05 -0700 (PDT) Received: from wantadilla.lemis.com (wantadilla.lemis.com [192.109.197.80]) by mx1.FreeBSD.org (Postfix) with ESMTP id C7BF943E7B; Fri, 11 Oct 2002 17:37:03 -0700 (PDT) (envelope-from grog@lemis.com) Received: by wantadilla.lemis.com (Postfix, from userid 1004) id C15C38113B; Sat, 12 Oct 2002 10:07:00 +0930 (CST) Date: Sat, 12 Oct 2002 10:07:00 +0930 From: Greg 'groggy' Lehey To: Lasse Laursen Cc: FreeBSD Questions Subject: Re: Raid-1 and Vinum Message-ID: <20021012003700.GB12742@wantadilla.lemis.com> References: <020d01c27120$47746de0$1a01000a@area51> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <020d01c27120$47746de0$1a01000a@area51> User-Agent: Mutt/1.4i 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 Please don't send questions of this nature to FreeBSD-stable. FreeBSD-questions is the correct forum. On Friday, 11 October 2002 at 14:18:16 +0200, 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? Apparently not. You don't need to do anything if one of the components of a volume fails. Recovery is automatic. > Eg. if one of the raids fail we will be able to mount the existing > part of the raid as a regular disk? Well, you would have to unmount it first, and I'd strongly recommend against this course of action. That way you would lose your update timestamps, and so if your other disk came up again, Vinum would see the same update timestamp on both and bring them both up, though they would be inconsistent. I don't know why you would want to do this, anyway. In this configuration, your volume would continue to function in degraded mode without any intervention. 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