From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-ie0-f180.google.com ([209.85.223.180]:34964 "EHLO mail-ie0-f180.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753742AbbGPLuO (ORCPT ); Thu, 16 Jul 2015 07:50:14 -0400 Received: by iecuq6 with SMTP id uq6so53905653iec.2 for ; Thu, 16 Jul 2015 04:50:14 -0700 (PDT) Received: from [127.0.0.1] (rrcs-70-62-41-24.central.biz.rr.com. [70.62.41.24]) by smtp.googlemail.com with ESMTPSA id p138sm4838183ioe.35.2015.07.16.04.50.11 for (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Thu, 16 Jul 2015 04:50:12 -0700 (PDT) Message-ID: <55A79A67.8010408@gmail.com> Date: Thu, 16 Jul 2015 07:49:59 -0400 From: Austin S Hemmelgarn MIME-Version: 1.0 To: linux-btrfs Subject: Re: BTRFS raid6 unmountable after a couple of days of usage. References: <55A4F74D.9000305@gmail.com> In-Reply-To: <55A4F74D.9000305@gmail.com> Content-Type: multipart/signed; protocol="application/pkcs7-signature"; micalg=sha1; boundary="------------ms090304000005040208060807" Sender: linux-btrfs-owner@vger.kernel.org List-ID: This is a cryptographically signed message in MIME format. --------------ms090304000005040208060807 Content-Type: text/plain; charset=windows-1252; format=flowed Content-Transfer-Encoding: quoted-printable On 2015-07-14 07:49, Austin S Hemmelgarn wrote: > So, after experiencing this same issue multiple times (on almost a doze= n different kernel versions since 4.0) and ruling out the possibility of = it being caused by my hardware (or at least, the RAM, SATA controller and= disk drives themselves), I've decided to report it here. > > The general symptom is that raid6 profile filesystems that I have are w= orking fine for multiple weeks, until I either reboot or otherwise try to= remount them, at which point the system refuses to mount them. > > I'm currently using btrfs-progs v4.1 with kernel 4.1.2, although I've b= een seeing this with versions of both since 4.0. > > Output of 'btrfs fi show' for the most recent fs that I had this issue = with: > Label: 'altroot' uuid: 86eef6b9-febe-4350-a316-4cb00c40bbc5 > Total devices 4 FS bytes used 9.70GiB > devid 1 size 24.00GiB used 6.03GiB path /dev/mapper/vg-altroot.0 > devid 2 size 24.00GiB used 6.01GiB path /dev/mapper/vg-altroot.1 > devid 3 size 24.00GiB used 6.01GiB path /dev/mapper/vg-altroot.2 > devid 4 size 24.00GiB used 6.01GiB path /dev/mapper/vg-altroot.3 > > btrfs-progs v4.1 > > Each of the individual LVS that are in the FS is just a flat chunk of s= pace on a separate disk from the others. > > The FS itself passes btrfs check just fine (no reported errors, exit va= lue of 0), but the kernel refuses to mount it with the message 'open_ctre= e failed'. > > I've run btrfs chunk recover and attached the output from that. > > Here's a link to an image from 'btrfs image -c9 -w': https://www.dropbo= x.com/s/pl7gs305ej65u9q/altroot.btrfs.img?dl=3D0 > (That link will expire in 30 days, let me know if you need access to it= beyond that). > > The filesystems in question all see relatively light but consistent usa= ge as targets for receiving daily incremental snapshots for on-system bac= kups (and because I know someone will mention it, yes, I do have other ba= ckups of the data, these are just my online backups). > Secondary but possibly related issue, I'm seeing similar issues with all = data/metadata profiles when using BTRFS on top of a dm-thinp volume with = zeroing-mode turned off (that is, discard doesn't clear data from the=20 areas that were discarded). --------------ms090304000005040208060807 Content-Type: application/pkcs7-signature; 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