From owner-freebsd-current@FreeBSD.ORG Mon Jun 14 05:46:23 2004 Return-Path: <owner-freebsd-current@FreeBSD.ORG> Delivered-To: freebsd-current@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 8DA7716A4CE for <freebsd-current@freebsd.org>; Mon, 14 Jun 2004 05:46:23 +0000 (GMT) Received: from carver.gumbysoft.com (carver.gumbysoft.com [66.220.23.50]) by mx1.FreeBSD.org (Postfix) with ESMTP id 4259F43D54 for <freebsd-current@freebsd.org>; Mon, 14 Jun 2004 05:46:23 +0000 (GMT) (envelope-from dwhite@gumbysoft.com) Received: by carver.gumbysoft.com (Postfix, from userid 1000) id BEC9F72DF4; Sun, 13 Jun 2004 22:46:22 -0700 (PDT) Received: from localhost (localhost [127.0.0.1]) by carver.gumbysoft.com (Postfix) with ESMTP id B950772DF2; Sun, 13 Jun 2004 22:46:22 -0700 (PDT) Date: Sun, 13 Jun 2004 22:46:22 -0700 (PDT) From: Doug White <dwhite@gumbysoft.com> To: Paul Mather <paul@gromit.dlib.vt.edu> In-Reply-To: <1087173751.697.70.camel@zappa.Chelsea-Ct.Org> Message-ID: <20040613223840.L84464@carver.gumbysoft.com> References: <1087173751.697.70.camel@zappa.Chelsea-Ct.Org> MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII cc: freebsd-current@freebsd.org Subject: Re: ATA RAID rebuild not rebuilding X-BeenThere: freebsd-current@freebsd.org X-Mailman-Version: 2.1.1 Precedence: list List-Id: Discussions about the use of FreeBSD-current <freebsd-current.freebsd.org> List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-current>, <mailto:freebsd-current-request@freebsd.org?subject=unsubscribe> List-Archive: <http://lists.freebsd.org/pipermail/freebsd-current> List-Post: <mailto:freebsd-current@freebsd.org> List-Help: <mailto:freebsd-current-request@freebsd.org?subject=help> List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-current>, <mailto:freebsd-current-request@freebsd.org?subject=subscribe> X-List-Received-Date: Mon, 14 Jun 2004 05:46:23 -0000 On Sun, 13 Jun 2004, Paul Mather wrote: > I have a recent 5.2-CURRENT system (last built 9th June, 2004) on which > I thought I'd try a RAID 1 mirror using ATA RAID on the built-in Intel > '82371AB/EB/MB PIIX4/4E/4M IDE Controller.' Note there is no hardware RAID support in this controller, so if the wrong disk fails you may not be able to boot. Its just a generic chipset IDE controller. > In summary, I can build and use an ar0 mirror, but whenever I try to > simulate a failure and reconstruction (via atacontrol detach followed by > an atacontrol attach, as described in section 12.4.3 of the FreeBSD > Handbook) the subsequent "atacontrol rebuild ar0" does nothing (it > returns to the prompt immediately) and the ar0 array is still flagged as > DEGRADED (and the detached/attached drive as DOWN). It appears > impossible to revive the array. It should crank up a rebuild thread that will start reconstructing the failed drive in the background. You can see its status with 'ps ax'. Its been a while since I've done this and I've only done it with Promise controllers, which do support RAID features on boot. I think you may have to add the broken disk back as a spare (using 'atacontrol addspare') then initiate the rebuild. > Also, what is the canonical way to construct an array on a built-in > controller? I have two identical ATA drives: ad1 on ATA channel 0, and > ad2 on ATA channel 1. Assuming these are both unpartitioned/empty, do I > first have to fdisk the individual drives or is it enough to "atacontrol > create RAID1 ad1 ad2" and then "fdisk -BI ar0" and bsdlabel ar0s1? You need to create the RAID container first, so atacontrol, then partition the newly minted ar0. > Where is the ATA RAID metadata stored? How is consistency maintained? > Is there some way of forcing a reconstruction onto a particular drive? The metadata is stored on the disks themselves. > In a verbose boot, the array configuration is output. For some reason, > it is flagged as PROMISE. Shouldn't this be FREEBSD? Might that be > confusing the rebuild process, or is rebuilding done identically both on > FreeBSD ATA RAID and Promise ATA RAID controllers? FreeBSD the Promise metadata format in the absence of anything telling it otherwise. It just happens that you don't have a Promise controller that can understand the metadata. :) Incidentally, don't create stripes (RAID0) using this config and expect to boot off of them, 'cause you won't be able to. You need hardware support to do that. -- Doug White | FreeBSD: The Power to Serve dwhite@gumbysoft.com | www.FreeBSD.org