From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-qg0-f49.google.com ([209.85.192.49]:53223 "EHLO mail-qg0-f49.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755221AbaKRQDD (ORCPT ); Tue, 18 Nov 2014 11:03:03 -0500 Received: by mail-qg0-f49.google.com with SMTP id a108so5385744qge.8 for ; Tue, 18 Nov 2014 08:03:00 -0800 (PST) Message-ID: <546B6D8F.7090005@ubuntu.com> Date: Tue, 18 Nov 2014 11:02:23 -0500 From: Phillip Susi MIME-Version: 1.0 To: Austin S Hemmelgarn , Brendan Hide , "linux-btrfs@vger.kernel.org" Subject: Re: scrub implies failing drive - smartctl blissfully unaware References: <546AF572.2020101@swiftspirit.co.za> <546B36A4.2030101@gmail.com> In-Reply-To: <546B36A4.2030101@gmail.com> Content-Type: text/plain; charset=windows-1252 Sender: linux-btrfs-owner@vger.kernel.org List-ID: -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 On 11/18/2014 7:08 AM, Austin S Hemmelgarn wrote: > In addition to the storage controller being a possibility as > mentioned in another reply, there are some parts of the drive that > aren't covered by SMART attributes on most disks, most notably the > on-drive cache. There really isn't a way to disable the read cache > on the drive, but you can disable write-caching, which may improve > things (and if it's a cheap disk, may provide better reliability > for BTRFS as well). The other thing I would suggest trying is a > different data cable to the drive itself, I've had issues with some > SATA cables (the cheap red ones you get in the retail packaging for > some hard disks in particular) having either bad connectors, or bad > strain-reliefs, and failing after only a few hundred hours of use. SATA does CRC the data going across it so if it is a bad cable, you get CRC, or often times 8b10b coding errors and the transfer is aborted rather than returning bad data. -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.17 (MingW32) iQEcBAEBAgAGBQJUa22PAAoJEI5FoCIzSKrwqlAH/3p1iftYkX3DAMgMmWra9AZT 2OA4PIwzgKIhANpy+ZQo4c+W1ZUwo2V6sxLvG8/oM3HfITGyfwNA5HgTbQrlx/iU vdRHq+y60gCruIa0lRST5JCQMbez7eXvSNOWNAZYbtNH/BNyMxwFuav14zFZpNxO QovXxhk1D5vLf+ID2jwa5mF1Zj7b5GEhb4zzqK+xU1QNeWppLFhB3da+llae8qxf eFtNt8ebtknr7QMCFrbaYCq1z1I+Fy8EjskkdI4ZW6AgBRPQDDmB8gNCmAAbSaZC 2Ze/AB4Xr6uuGQ4iK7nprKXUtPJFLzGYx+JQ2EeBJtin9ivno1fEY45CMreuzv4= =6Oy/ -----END PGP SIGNATURE-----