From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-4.1 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id EA13BC433E7 for ; Wed, 2 Sep 2020 13:47:58 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 8F8F32083B for ; Wed, 2 Sep 2020 13:47:58 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=karlsbakk.net header.i=@karlsbakk.net header.b="zM/qIeg6" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726933AbgIBNrj (ORCPT ); Wed, 2 Sep 2020 09:47:39 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:34078 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727803AbgIBNrQ (ORCPT ); Wed, 2 Sep 2020 09:47:16 -0400 Received: from zimbra.karlsbakk.net (zimbra.karlsbakk.net [IPv6:2a0a:51c0:0:1f:4ca5::2]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 01CADC061251 for ; Wed, 2 Sep 2020 06:37:19 -0700 (PDT) Received: from localhost (localhost.localdomain [IPv6:::1]) by zimbra.karlsbakk.net (Postfix) with ESMTP id 20C4E3C273F; Wed, 2 Sep 2020 15:36:12 +0200 (CEST) Received: from zimbra.karlsbakk.net ([IPv6:::1]) by localhost (zimbra.karlsbakk.net [IPv6:::1]) (amavisd-new, port 10032) with ESMTP id uiLPRCmyfT59; Wed, 2 Sep 2020 15:36:10 +0200 (CEST) Received: from localhost (localhost.localdomain [IPv6:::1]) by zimbra.karlsbakk.net (Postfix) with ESMTP id B07333C27C6; Wed, 2 Sep 2020 15:36:10 +0200 (CEST) DKIM-Filter: OpenDKIM Filter v2.10.3 zimbra.karlsbakk.net B07333C27C6 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=karlsbakk.net; s=1DC131FE-D37A-11E7-BD32-3AD4DFE620DF; t=1599053770; bh=Jm098Z94iMl7J1Lui1HzOS+is138pFHIUfugQs6rOuQ=; h=Date:From:To:Message-ID:MIME-Version; b=zM/qIeg6YwVPs/Hs07L7WzhpmZ0wFqOAEFPOlNiWpFU1BkjyRCyuMp7Wur6BbPNjb JhdcnwfosRm0eSc5u1OeZVckRf7CNbEK4YUShYbn5X9gM5aF1k+bbKO30l5szDV7An vl5VBzNrUWAQKaONfKoZ52UNJls12mUlKs7kW7wEV12e6JZllTIj75iOtdBo8Zm9Hd oZSJ+eWGTuNFjXD7n6eqcawG5OqM/peXi/CNE1Cxbkw6c3rd9TrTyU0aJ9gYZ+Tr+E r9FO33hvC4UgEPCGWjuotYbkxLmIOab7oa7ywfuknXueck0rAb99OukYJB0tj5GuGT lvXDxbzjaN+Xg== X-Virus-Scanned: amavisd-new at zimbra.karlsbakk.net Received: from zimbra.karlsbakk.net ([IPv6:::1]) by localhost (zimbra.karlsbakk.net [IPv6:::1]) (amavisd-new, port 10026) with ESMTP id sYFSLyar8nSZ; Wed, 2 Sep 2020 15:36:10 +0200 (CEST) Received: from zimbra.karlsbakk.net (localhost.localdomain [127.0.0.1]) by zimbra.karlsbakk.net (Postfix) with ESMTP id 8E1693C273F; Wed, 2 Sep 2020 15:36:10 +0200 (CEST) Date: Wed, 2 Sep 2020 15:36:09 +0200 (CEST) From: Roy Sigurd Karlsbakk To: "David C. Rankin" Cc: Linux Raid Message-ID: <51057261.933837.1599053769942.JavaMail.zimbra@karlsbakk.net> In-Reply-To: <37b43194-f372-dd04-a319-34406f63c5a2@suddenlinkmail.com> References: <75076966.1748398.1597773608869.JavaMail.zimbra@karlsbakk.net> <001c5a42-93fd-eddb-ba86-aa3e2695f2a8@thehawken.org> <37b43194-f372-dd04-a319-34406f63c5a2@suddenlinkmail.com> Subject: Re: Feature request: Remove the badblocks list MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable X-Originating-IP: [2a01:79c:cebf:61e4:95bb:fcf8:43db:53b] X-Mailer: Zimbra 8.8.10_GA_3801 (ZimbraWebClient - FF80 (Mac)/8.8.10_GA_3786) Thread-Topic: Feature request: Remove the badblocks list Thread-Index: DLg5POTzmtwo9eVn75aBYJuqGQ4wvg== Sender: linux-raid-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-raid@vger.kernel.org ----- Original Message ----- > From: "David C. Rankin" > To: "Linux Raid" > Sent: Saturday, 22 August, 2020 03:42:40 > Subject: Re: Feature request: Remove the badblocks list > On 8/18/20 4:03 PM, H=C3=A5kon Struijk Holmen wrote: >> Hi, >>=20 >> Thanks for the CC, I just managed to get myself subscribed to the list := ) >>=20 >> I have gathered some thoughts on the subject as well after reading up on= it, >> figuring out the actual header format is, and writing a tool [3] to fix = my >> array... >>=20 > >> But I have some complaints about the thing.. >=20 > Well, >=20 > There is code in all things that can be fixed, but I for one will chime = in > and say I don't care if a lose a strip or two so long as on a failed disk= I > pop the new one in and it rebuilds without issue (which it does, even whe= n the > disk was replaced due to bad blocks) >=20 > So whatever is done, don't fix what isn't broken and introduce more bugs > along the way. If this is such an immediate problem, then why are patches > being attached to the complaints? The problem is that it's already broken. Take a single mirror. One drive ex= periences a bad sector, fine, you have redundancy, so you read the data fro= m the other drive and md flags the sector as bad. The drive two is replaced= , you lose the data. The new drive will get flagged with the same sector nu= mber as faulty, since the first drive has it flagged. So you replace the fi= rst drive and during resync, it also gets flagged as having a bad sector. A= nd so on. Modern (that is, disks since 20 years ago or so) reallocate sectors as they= wear out. We have redundancy to handle errors, not to pinpoint them on dis= ks and fill up not-so-smart lists with broken sectors that work. If md sees= a drive with excessive errors, that drive should be kicked out, marked as = dead, but not interfere with the rest of the raid. Vennlig hilsen roy --=20 Roy Sigurd Karlsbakk (+47) 98013356 http://blogg.karlsbakk.net/ GPG Public key: http://karlsbakk.net/roysigurdkarlsbakk.pubkey.txt -- Hi=C3=B0 g=C3=B3=C3=B0a skaltu =C3=AD stein h=C3=B6ggva, hi=C3=B0 illa =C3= =AD snj=C3=B3 rita.