From owner-freebsd-fs@freebsd.org Mon Jul 30 06:44:06 2018 Return-Path: Delivered-To: freebsd-fs@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id DC529104C406 for ; Mon, 30 Jul 2018 06:44:05 +0000 (UTC) (envelope-from rob@nofocus.org) Received: from mail-qt0-x22a.google.com (mail-qt0-x22a.google.com [IPv6:2607:f8b0:400d:c0d::22a]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (Client CN "smtp.gmail.com", Issuer "Google Internet Authority G2" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 80C168ABEE for ; Mon, 30 Jul 2018 06:44:05 +0000 (UTC) (envelope-from rob@nofocus.org) Received: by mail-qt0-x22a.google.com with SMTP id c15-v6so11007595qtp.0 for ; Sun, 29 Jul 2018 23:44:04 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=nofocus.org; s=google; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=Y2JgKhh3yO6rMvF0H0bWYU50JwZg+f9lAeJ6bHhH5KY=; b=eWPSORF3LcClC3h2O9mi+GnBoH3JeLYfuoI9lkgVzSozVYcj2Kcmb5JNPl0oxJ6HSZ XcfStY3YUQaQj8q7zaelXYinxBFrJrL8P5q8+uzozL+jBqcajmi05TNwpuYX1wSjqEFG bYbTb0q9u86sWwYWDYJC2BAEKIViXdHqsBZG0= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=Y2JgKhh3yO6rMvF0H0bWYU50JwZg+f9lAeJ6bHhH5KY=; b=H8U/MGX7e+FPtuZwU7y8f92keebO4sQw6gU+wCwoQtTGgOJ8I4kIAXufn9KFDGzWsp 5bsEcy/6A83PExjlt9gm7t6EdulXjb/UbAkyGcjXb2TT7glF5/xSuRY7R+R7yzI0rdsL cSOGn8tQIcG8eScOoT72A5Hkvr/9roNAYjc7kLR0IZPQj/TB257EUCcFi5lxjUfCTjr8 QOIWB9oJg68vXaXUhsbqn7oYXGiZSL0YnFUD/eeIa3VCamsWjwJzOQ5GPgteeS/MI3/6 gp/xivlqeukmzyWGBMVAT1Fu0ot47ebGlE92bGqaO8yj5E8utNxRcsKzQq7J1Uoy74EJ sT4Q== X-Gm-Message-State: AOUpUlG8G1LFFeLq5UvYv97stZjLWa6zegDraMw8G+vbRon3w45RvN06 AXoNAok59Hbbx3p3oQ3e23f2FdR2B2jRYh7hPECCWVOq X-Google-Smtp-Source: AAOMgpdNjJkkeNyAKnvzk7oiU8O21pT0Vlm/WrsYr3jz8NAAuN07/5fM1qTr0IkePPdUrJvgDk5KPcWIWVU+yotj7EQ= X-Received: by 2002:aed:2d63:: with SMTP id h90-v6mr15273239qtd.190.1532933044235; Sun, 29 Jul 2018 23:44:04 -0700 (PDT) MIME-Version: 1.0 References: <20180727130743.GB45967@fuz.su> <20180730063804.GA4409@server.rulingia.com> In-Reply-To: <20180730063804.GA4409@server.rulingia.com> From: Robert Banz Date: Sun, 29 Jul 2018 23:43:53 -0700 Message-ID: Subject: Re: badsect(8) is gone -- what now? To: Peter Jeremy Cc: Robert Clausecker , freebsd-fs@freebsd.org Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Content-Filtered-By: Mailman/MimeDel 2.1.27 X-BeenThere: freebsd-fs@freebsd.org X-Mailman-Version: 2.1.27 Precedence: list List-Id: Filesystems List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 30 Jul 2018 06:44:06 -0000 And if you=E2=80=99re just trying to recover your data from said disk, try = out =E2=80=98ddrescue=E2=80=99 and dump the partition to a file or another disk= . On Mon, Jul 30, 2018 at 2:38 AM Peter Jeremy wrote: > On 2018-Jul-27 15:07:43 +0200, Robert Clausecker wrote: > >Is there any way the kernel interface for badsect(8) or a utilitiy > >fulfilling a similar purpose is going to come back? I understand that > >kernel support was removed due to possible misuse of mknod(S_IFMT) > >leading to crashes [1], but there really ought to be some way to mark a > >sector as bad if the disk doesn't want to do it for you. > > All modern disks do bad sector mapping in the drive firmware. In general= , > if you disk reaches a point where it can't remap a visibly bad sector the= n > the drive's internal set of spare blocks is exhausted and the disk is abo= ut > to fail completely. The recommended solution is to replace the disk. Ha= ve > you looked at the disk's SMART stats (using eg > ports/sysutils/smartmontools)? > > One approach I've used in the past is to create a file covering the bad > sector(s), mark it immutable and stash it somewhere where you don't attem= pt > to read it. > > -- > Peter Jeremy >