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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 3E57BC433EF for ; Mon, 31 Jan 2022 18:59:59 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1357719AbiAaS76 (ORCPT ); Mon, 31 Jan 2022 13:59:58 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:43492 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S244293AbiAaS75 (ORCPT ); Mon, 31 Jan 2022 13:59:57 -0500 Received: from mail-qk1-x729.google.com (mail-qk1-x729.google.com [IPv6:2607:f8b0:4864:20::729]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 4F6C8C061714 for ; Mon, 31 Jan 2022 10:59:57 -0800 (PST) Received: by mail-qk1-x729.google.com with SMTP id m25so12025319qka.9 for ; Mon, 31 Jan 2022 10:59:57 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=pFmDVUN8uF4nlXzB6LKQI7s0EthcJs4K55g431Pg16c=; b=j1KMH1IL0Ozy4Lcz3ZR49EOwjYnQb5CN1/5GUUDXHAUeGf12kyOTd3Bg5SLh4z4ToK C4RgxsY/sqfXECM9QK3UDPSMCQEnHR7TnHxND8gjjatsFe0zaoL9XDTA9j6pXn0XwZlM KLKmOwxLQAqNrBpZbnIjlIhGDVMhwcCyzR3faIZhb6n40G6NUU8fzgbrcwUMybaUW9o4 v9SEp+7WUANHTxLSJntJmvpcAvjNAS0UwM+A+pwBuVOULEdYv44+KEVFwyfgKj+ipYgt DPF6rwmOnxOJwidS4xHc1pam6D8CelrE179IVjDqNzw+CQ/cXjU+TN/iyAU52QiszG35 WkKA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=pFmDVUN8uF4nlXzB6LKQI7s0EthcJs4K55g431Pg16c=; b=sfFfVsKKfty0c41UGYh34SHeUFZY5yt2TG1x/onu++T8u5VIXbRVX3Ffd4MC6GyMzX e3WX7V2COA1wwfD0ss0/rRDeVjmstkgSp4sQR/Hx7e4CQy2YBww7S2+y6+146aKFOxIO ukbnvr0o5mkXCm9Lk2ov5r2wk1WFR9NkuScGN0MiG77v4NdRJlwyEj3Hk9RpZBXCrbhb wTlhMSykyBmvt3qNTKqOQXAaeJa5v1d/8KiFtSzJFFaQdLsNGwhh8bkJ2CTwfVKmGsY3 RaPSZqvU7FqIziknGS1jo2MSVUFibPKd5hNjxy2q08imfugRhEXI41Fce2XsMwf3ST+N lOGg== X-Gm-Message-State: AOAM532ajneFaE4zIrgt6KqeowBIp+JX7lRwWYGbtVDnbAiIY1CcktmR B2GdIeQ4bZvSUnn1xzUWkCfrRo+RcFElP3nznGROYmQS X-Google-Smtp-Source: ABdhPJzk/ktl0jPD5+CeO2M7a/3dx/FuSTZfvUcY9rcrbZdqK61bI6NendhMGz34bJDVQeiN/uZfUDF/KF5xqe9VQxg= X-Received: by 2002:a05:620a:4623:: with SMTP id br35mr8373062qkb.586.1643655596397; Mon, 31 Jan 2022 10:59:56 -0800 (PST) MIME-Version: 1.0 References: <20220121164804.GE14596@justpickone.org> <6cfb92e5-5845-37ff-d237-4c3d663446e3@youngman.org.uk> <33fb3dfd-e234-14d9-7643-3449c700a241@youngman.org.uk> <7571b432-4b19-3de4-b04d-3a46b09b0629@turmel.org> <87leyvvrqp.fsf@esperi.org.uk> In-Reply-To: <87leyvvrqp.fsf@esperi.org.uk> From: Roger Heflin Date: Mon, 31 Jan 2022 12:59:33 -0600 Message-ID: Subject: Re: hardware recovery and RAID5 services To: Nix Cc: Wols Lists , Phil Turmel , David T-G , Linux RAID Content-Type: text/plain; charset="UTF-8" Precedence: bulk List-ID: X-Mailing-List: linux-raid@vger.kernel.org And do not do write-sector on a disk that is in use in RAID, otherwise that sectors data is gone. I will completely remove a disk/partition and do --write-sectors against it and then do a --add (don't do a re-add). In general though I have not had a lot of luck with the write-sector fixing and/or forcing a reallocate even when the sector is clearly bad. I have to conclude (based on both WD and seagate not reallocating sectors that reliably fail rereads in <30-seconds after just being re-written) that pretty much everyone's disk firmware must suck. Would --make-bad-sector work to force a reallocate? On Mon, Jan 31, 2022 at 9:40 AM Nix wrote: > > On 29 Jan 2022, Wols Lists told this: > > > I believe there is also a way of injecting a hardware error onto a > > drive. Unless you can take a backup of the backup :-) I wouldn't > > recommend it at the moment, but there's some ATA command or whatever > > that tells the drive to flag a sector as bad, and return a read error > > until it's over-written. > > See hdparm --make-bad-sector. The manpage says "EXCEPTIONALLY DANGEROUS. > DO NOT USE THIS OPTION!!". It is not lying. :) > > (This is also --write-sector, which is merely VERY DANGEROUS, but can be > used to force rewrites of bad sectors. Make sure you get the sector > number right! Needless to say, if you don't, it's too late, and there's > no real way to test in advance...)