From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from pigeon.gentoo.org ([69.77.167.62] helo=lists.gentoo.org) by finch.gentoo.org with esmtp (Exim 4.60) (envelope-from ) id 1Jdp4x-0004Vt-Ht for garchives@archives.gentoo.org; Mon, 24 Mar 2008 15:59:19 +0000 Received: from pigeon.gentoo.org (localhost [127.0.0.1]) by pigeon.gentoo.org (Postfix) with SMTP id D5FA1E0783; Mon, 24 Mar 2008 15:59:17 +0000 (UTC) Received: from nf-out-0910.google.com (nf-out-0910.google.com [64.233.182.188]) by pigeon.gentoo.org (Postfix) with ESMTP id 8928EE0783 for ; Mon, 24 Mar 2008 15:59:17 +0000 (UTC) Received: by nf-out-0910.google.com with SMTP id f5so878569nfh.26 for ; Mon, 24 Mar 2008 08:59:16 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=beta; h=domainkey-signature:received:received:from:to:subject:date:user-agent:references:in-reply-to:mime-version:content-type:content-transfer-encoding:content-disposition:message-id; bh=QYoKJquGtYx8bV59mfzCgXNNxHNMMMER2eqJAAPm890=; b=MzmYIZhNkiaF77srec+CQ6Cgim6kmcseNtWtWjIJOwwdJkXSs2GovcL63IVhnudK00Q6DiNV96dglQFzP4RLX+3hCwAPKj6xIeAWZ/EXtEfHLGxV/ZE2+t08gtrkpJMDrj5ZCr7+/F5TNoG1Lp+IiytdYWuYXW4gNfjnyC2GOZw= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=beta; h=from:to:subject:date:user-agent:references:in-reply-to:mime-version:content-type:content-transfer-encoding:content-disposition:message-id; b=UO8xlqhtq0F1KIZ6WMirO4T3lL9NxEqqycH5oT8C8Ki/CITepU0/+ayNcXgJHFPY9BlXtGoiQVIYThlkJZjilVfcyuGx1TU2wnAem0exc3Gb7qvFZ9Q/c2j6Pk3lo7T+FwkqTnmxn4W8uk7vPb6WpBBAVx6TsBN6K7GCMjR02lg= Received: by 10.78.188.13 with SMTP id l13mr15377278huf.0.1206374354793; Mon, 24 Mar 2008 08:59:14 -0700 (PDT) Received: from ?10.0.0.3? ( [41.243.230.74]) by mx.google.com with ESMTPS id 36sm6232899huc.12.2008.03.24.08.59.10 (version=SSLv3 cipher=OTHER); Mon, 24 Mar 2008 08:59:12 -0700 (PDT) From: Alan McKinnon To: gentoo-user@lists.gentoo.org Subject: Re: [gentoo-user] defect management block device Date: Mon, 24 Mar 2008 17:58:14 +0200 User-Agent: KMail/1.9.9 References: <20080324143245.GC10053@nibiru.local> In-Reply-To: <20080324143245.GC10053@nibiru.local> Precedence: bulk List-Post: List-Help: List-Unsubscribe: List-Subscribe: List-Id: Gentoo Linux mail X-BeenThere: gentoo-user@lists.gentoo.org Reply-to: gentoo-user@lists.gentoo.org MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit Content-Disposition: inline Message-Id: <200803241758.14792.alan.mckinnon@gmail.com> X-Archives-Salt: 3dac329a-93b4-4c10-8ce6-3bf3a0fb546b X-Archives-Hash: 1af22937ec0f48b9f23c882ff6962268 On Monday 24 March 2008, Enrico Weigelt wrote: > Hi folks, > > > does anyone know an (virtual) block device which can do automatic > defect management (if the underlying disks have badblocks) ? > > My idea goes like this: > * one or more devices are assigned to one block device > * a bunch of spare blocks are reserved for defect management > (so the device looks smaller than the sum of assigned disks) > * if an badblock is detected, it's automatically remapped > to an spare block > > In fact, just what drive-internal defect manangement does, but > at OS / driver level. I don't see the point, unless you are dealing with drives that do not have defect management. What makes you think you can accomplish this result better than the firmware on the drive? It seems to me that if the drive firmware missed the opportunity to relocate the bad block, then your window of opportunity to do it in your code has long since passed. IOW, the OS code cannot possibly ever achieve it's design result. Just a thought, maybe you know some aspect of disks that I don't and can see where this would be useful. From where I sit, I can;t see any such use-case. -- Alan McKinnon alan dot mckinnon at gmail dot com -- gentoo-user@lists.gentoo.org mailing list