From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-io0-f182.google.com ([209.85.223.182]:35610 "EHLO mail-io0-f182.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753280AbbHYOxM (ORCPT ); Tue, 25 Aug 2015 10:53:12 -0400 Received: by iodt126 with SMTP id t126so189824105iod.2 for ; Tue, 25 Aug 2015 07:53:11 -0700 (PDT) Subject: Re: Btrfs tragedy: lack of space for metadata leads to loss of fs. To: =?UTF-8?Q?Miguel_Negr=c3=a3o?= , linux-btrfs@vger.kernel.org References: <55DC74E2.9000909@gmail.com> From: Austin S Hemmelgarn Message-ID: <55DC8151.1020203@gmail.com> Date: Tue, 25 Aug 2015 10:53:05 -0400 MIME-Version: 1.0 In-Reply-To: Content-Type: multipart/signed; protocol="application/pkcs7-signature"; micalg=sha-512; boundary="------------ms040205090808070702030003" Sender: linux-btrfs-owner@vger.kernel.org List-ID: This is a cryptographically signed message in MIME format. --------------ms040205090808070702030003 Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: quoted-printable On 2015-08-25 10:26, Miguel Negr=C3=A3o wrote: > Austin S Hemmelgarn gmail.com> writes: > >> One comment I would like to make about this: I have heard numerous >> stories of OCZ brand SSD's having significant data corruption issues >> (along the lines of writes returning successful when they really faile= d, >> and blocks that are in use getting randomly erased) that can cause >> severe data loss and filesystem problems. While I do think that btrfs= >> needs to be improved when faced with such things, I would not at all b= e >> surprised if the SSD was the root cause of the issue. >> >> > > > It did have some corruption through its 3 year life time. This was from= one > month ago: > > sudo btrfs device stats / > > [/dev/sda5].write_io_errs 0 > [/dev/sda5].read_io_errs 0 > [/dev/sda5].flush_io_errs 0 > [/dev/sda5].corruption_errs 996 > [/dev/sda5].generation_errs 0 > > On the latest scrub that I took note of the results though, it didn't h= ave > corruption: > > sudo btrfs scrub status / > scrub status for f2e4e4d3-2d8e-4764-a818-de9176405c4b > scrub started at Fri Apr 17 14:42:47 2015 and finished after 146 secon= ds > total bytes scrubbed: 66.10GiB with 0 errors IIRC, scrub (or at least the old versions) only reports the errors it=20 finds, not cumulative ones (hence the device stats sub-command), so I'd=20 still suggest being cautious. --------------ms040205090808070702030003 Content-Type: application/pkcs7-signature; name="smime.p7s" Content-Transfer-Encoding: base64 Content-Disposition: attachment; filename="smime.p7s" Content-Description: S/MIME Cryptographic Signature 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