From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S266341AbUHaDMk (ORCPT ); Mon, 30 Aug 2004 23:12:40 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S266349AbUHaDMk (ORCPT ); Mon, 30 Aug 2004 23:12:40 -0400 Received: from shawidc-mo1.cg.shawcable.net ([24.71.223.10]:2217 "EHLO pd3mo3so.prod.shaw.ca") by vger.kernel.org with ESMTP id S266341AbUHaDMb (ORCPT ); Mon, 30 Aug 2004 23:12:31 -0400 Date: Mon, 30 Aug 2004 18:17:24 -0600 From: Robert Hancock Subject: Re: Driver retries disk errors. To: linux-kernel Message-id: <002e01c48eef$e3e2dc40$6601a8c0@northbrook> MIME-version: 1.0 X-MIMEOLE: Produced By Microsoft MimeOLE V6.00.2900.2180 X-Mailer: Microsoft Outlook Express 6.00.2900.2180 Content-type: text/plain; reply-type=original; charset=iso-8859-1; format=flowed Content-transfer-encoding: 7bit X-Priority: 3 X-MSMail-priority: Normal References: Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Quite likely, in that case the drive has exhausted its spare pool, and there are a bunch of bad sectors that have already been reallocated. Some drives will reallocate sectors if they are still readable but the sector appears to be marginal. ----- Original Message ----- From: "Rogier Wolff" Newsgroups: fa.linux.kernel To: "Theodore Ts'o" ; ; Sent: Monday, August 30, 2004 4:19 PM Subject: Re: Driver retries disk errors. > On Mon, Aug 30, 2004 at 01:46:32PM -0400, Theodore Ts'o wrote: >> > a filesystem: if we recover one block this way, the next block will be >> > errorred and the filesystem "crashes" anyway. In fact this behaviour >> > may masquerade the first warnings that something is going wrong.... >> >> If the block gets successfully read after 2 or 3 tries, it might be a >> good idea for the kernel to automatically do a forced rewrite of the >> block, which should cause the disk to do its own disk block >> sparing/reassignment. > > Hi Ted, > > I agree that this is the theory. In practise however, I've never > seen it work correctly. We've seen several disks with say 1-5 bad > blocks and nothing else, and "dd if=/dev/zero of=/dev/" doesn't > seem to cure them. > > Roger. > > -- > +-- Rogier Wolff -- www.harddisk-recovery.nl -- 0800 220 20 20 -- > | Files foetsie, bestanden kwijt, alle data weg?! > | Blijf kalm en neem contact op met Harddisk-recovery.nl! > - > To unsubscribe from this list: send the line "unsubscribe linux-kernel" in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html > Please read the FAQ at http://www.tux.org/lkml/