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 1JdrLC-0005Ik-4o for garchives@archives.gentoo.org; Mon, 24 Mar 2008 18:24:14 +0000 Received: from pigeon.gentoo.org (localhost [127.0.0.1]) by pigeon.gentoo.org (Postfix) with SMTP id 2E3B2E0572; Mon, 24 Mar 2008 18:24:12 +0000 (UTC) Received: from py-out-1112.google.com (py-out-1112.google.com [64.233.166.181]) by pigeon.gentoo.org (Postfix) with ESMTP id 1BD4DE0572 for ; Mon, 24 Mar 2008 18:24:12 +0000 (UTC) Received: by py-out-1112.google.com with SMTP id w53so3464008pyg.25 for ; Mon, 24 Mar 2008 11:24:11 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=beta; h=domainkey-signature:received:received:message-id:date:from:user-agent:mime-version:to:subject:references:in-reply-to:x-enigmail-version:content-type:content-transfer-encoding; bh=W643+AdcHXiUmsbOp1N+fQcGBFXSMuLwBzN+e4Odl/E=; b=oEza3OJdOZo9UMJpupJvTN/iPxLLiv7uT2EFJa63UGmojvouMUhDZkr7jlUUcOPNAxwTd52eLS9oW54U2lw4bJwexARLkQjky8Jk5bTbBGEMHM+wVd4kMSF4nIpvtZq5lgOdwNp5oaVpzSb8xrmRHyUcdN37zjv3jzULJ7CD8Js= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=beta; h=message-id:date:from:user-agent:mime-version:to:subject:references:in-reply-to:x-enigmail-version:content-type:content-transfer-encoding; b=Bbi7d0tMGEslkfowa+jF60r/fXINn104J5oUkz5AwMnJbcBpF1BfFKS6iet5/cQdeDmlmlbhb28skAItwKc70toUog0BSn+xivo1P/4YNTWjVMOh5Og73Og04aGoi9NpeuQG4FwKfN7OKGUYA0gvFYN5Ja4my3Mf3Txmxs8KlCE= Received: by 10.65.182.11 with SMTP id j11mr13986932qbp.27.1206383051315; Mon, 24 Mar 2008 11:24:11 -0700 (PDT) Received: from ?192.168.1.100? ( [68.114.95.159]) by mx.google.com with ESMTPS id p4sm6827582qba.15.2008.03.24.11.24.09 (version=TLSv1/SSLv3 cipher=RC4-MD5); Mon, 24 Mar 2008 11:24:10 -0700 (PDT) Message-ID: <47E7F1A1.8090608@gmail.com> Date: Mon, 24 Mar 2008 14:23:29 -0400 From: Eric Martin User-Agent: Thunderbird 2.0.0.12 (Windows/20080213) 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 To: gentoo-user@lists.gentoo.org Subject: Re: [gentoo-user] defect management block device References: <20080324143245.GC10053@nibiru.local> <200803241758.14792.alan.mckinnon@gmail.com> In-Reply-To: <200803241758.14792.alan.mckinnon@gmail.com> X-Enigmail-Version: 0.95.6 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit X-Archives-Salt: 1dcd2341-9651-4f45-91b2-2396fa5bc752 X-Archives-Hash: a8c62945f2f6a61b15b716eaa7f07ddf Alan McKinnon wrote: > On Monday 24 March 2008, Enrico Weigelt wrote: > >> 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. > > While I see what Alan is saying, I'm pretty sure LVM does it. Device Drivers -> Multiple Devices Driver Support -> Bad Block Relocation Device Target. I've never played with it but I assume there's a lot of good reading on it. -- HTH, Eric -- gentoo-user@lists.gentoo.org mailing list