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 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 D441FC43461 for ; Wed, 2 Sep 2020 16:50:49 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id B3D8F20767 for ; Wed, 2 Sep 2020 16:50:49 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=karlsbakk.net header.i=@karlsbakk.net header.b="fmFMgWUB" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726794AbgIBQus (ORCPT ); Wed, 2 Sep 2020 12:50:48 -0400 Received: from zimbra.karlsbakk.net ([193.29.58.196]:60404 "EHLO zimbra.karlsbakk.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726526AbgIBQur (ORCPT ); Wed, 2 Sep 2020 12:50:47 -0400 Received: from localhost (localhost.localdomain [IPv6:::1]) by zimbra.karlsbakk.net (Postfix) with ESMTP id CB42B3C273F; Wed, 2 Sep 2020 18:50:44 +0200 (CEST) Received: from zimbra.karlsbakk.net ([IPv6:::1]) by localhost (zimbra.karlsbakk.net [IPv6:::1]) (amavisd-new, port 10032) with ESMTP id 8qfLqR6E2c4P; Wed, 2 Sep 2020 18:50:43 +0200 (CEST) Received: from localhost (localhost.localdomain [IPv6:::1]) by zimbra.karlsbakk.net (Postfix) with ESMTP id 662DC3C27C6; Wed, 2 Sep 2020 18:50:43 +0200 (CEST) DKIM-Filter: OpenDKIM Filter v2.10.3 zimbra.karlsbakk.net 662DC3C27C6 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=karlsbakk.net; s=1DC131FE-D37A-11E7-BD32-3AD4DFE620DF; t=1599065443; bh=SqxNp8vPSuR+6WwYPwypSSS6cYuSI6g+6fjAImvNXKM=; h=Date:From:To:Message-ID:MIME-Version; b=fmFMgWUBnyXsOfrVaxsTL2RVAOHnT3C56ixnPP1zxslIlWdDxTj6DGKUc7DmGFpHD AajNznP3AkINJvaZq02wGWe9G3lR4PZG+aW5IFM+WXmKcGgkA3f6A+WTOoY1BMkuaq 7zSP6gpRAqTF5LmPOSU7GMHAh+2Rz0jTy2HS3md2J4OGoHySZtHhhpcRB7zJNF1n/8 Woy4yVpq7hhI2v9kNpUu71DAAjT1CsjrWTe2bTdTK8p7NutbwmKEOFXYG/UKl3M0xQ 5tfT5Ng9R5ulPy8VGp6Jrr0XCrisxZVyZ6TrtWNv4qF4VWbAwVaiptIGIcr2k6epbO D6wWBJ2y0hfRQ== 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 hxB28a7uK6yk; Wed, 2 Sep 2020 18:50:43 +0200 (CEST) Received: from zimbra.karlsbakk.net (localhost.localdomain [127.0.0.1]) by zimbra.karlsbakk.net (Postfix) with ESMTP id 2ACBF3C273F; Wed, 2 Sep 2020 18:50:43 +0200 (CEST) Date: Wed, 2 Sep 2020 18:50:42 +0200 (CEST) From: Roy Sigurd Karlsbakk To: Adam Goryachev Cc: "David C. Rankin" , Linux Raid Message-ID: <482823895.1019975.1599065442417.JavaMail.zimbra@karlsbakk.net> In-Reply-To: <319708c9-cfda-ca0f-9d68-330cac8b6d7a@websitemanagers.com.au> References: <75076966.1748398.1597773608869.JavaMail.zimbra@karlsbakk.net> <37b43194-f372-dd04-a319-34406f63c5a2@suddenlinkmail.com> <51057261.933837.1599053769942.JavaMail.zimbra@karlsbakk.net> <8dce17fb-13df-b273-cc3d-b3f71d180354@websitemanagers.com.au> <1375662956.965590.1599058237477.JavaMail.zimbra@karlsbakk.net> <675330127.983718.1599060311646.JavaMail.zimbra@karlsbakk.net> <319708c9-cfda-ca0f-9d68-330cac8b6d7a@websitemanagers.com.au> 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:c00d:16fd:a3fa:4b2c] 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: A5fBnlohKMuIpM6Iatt+/GcToLMfQQ== Sender: linux-raid-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-raid@vger.kernel.org > Based in the linked page, you would need to do something like this: >=20 > 1) Create a clean array with correctly working disks >=20 > 2) Tell the underlying block device to pretend there is a read error on > a specific sector of one disk >=20 > 3) Ask MD to replace the "bad" block device with a "good" one Do you have a howto on 2,3? > 4) See what happens with the BBL >=20 > 5) Various steps of reading/writing to that specific stripe, and > document the outcome/behavior or this - how? > 6) Replace another drive, and document the results >=20 > Hint: there is a block device that could sit between your actual block > device and MD, and it can "pretend" there are certain errors. The > answers here seem to contain relevant information: > https://stackoverflow.com/questions/1870696/simulate-a-faulty-block-devic= e-with-read-errors >=20 > As I said, I suspect that if a reproducible error is found, then it > should be easier to fix the bug. >=20 > OTOH, you could just remove the BBL from your arrays, and ensure you > create new arrays without the BBL. Anything better than just "mdadm ... --assemble --update=3Dforce-no-bbl"? 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.