From owner-freebsd-fs@FreeBSD.ORG Mon Nov 18 19:14:33 2013 Return-Path: Delivered-To: freebsd-fs@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:1900:2254:206a::19:1]) (using TLSv1 with cipher ADH-AES256-SHA (256/256 bits)) (No client certificate requested) by hub.freebsd.org (Postfix) with ESMTPS id 1BB29701; Mon, 18 Nov 2013 19:14:33 +0000 (UTC) Received: from vps.rulingia.com (host-122-100-2-194.octopus.com.au [122.100.2.194]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.freebsd.org (Postfix) with ESMTPS id A7DDC2067; Mon, 18 Nov 2013 19:14:32 +0000 (UTC) Received: from server.rulingia.com (c220-239-250-249.belrs5.nsw.optusnet.com.au [220.239.250.249]) by vps.rulingia.com (8.14.7/8.14.5) with ESMTP id rAIJENV6001076 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=OK); Tue, 19 Nov 2013 06:14:24 +1100 (EST) (envelope-from peter@rulingia.com) X-Bogosity: Ham, spamicity=0.000000 Received: from server.rulingia.com (localhost.rulingia.com [127.0.0.1]) by server.rulingia.com (8.14.7/8.14.7) with ESMTP id rAIJEIxx075532 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=NO); Tue, 19 Nov 2013 06:14:18 +1100 (EST) (envelope-from peter@server.rulingia.com) Received: (from peter@localhost) by server.rulingia.com (8.14.7/8.14.7/Submit) id rAIJEHLe075531; Tue, 19 Nov 2013 06:14:17 +1100 (EST) (envelope-from peter) Date: Tue, 19 Nov 2013 06:14:17 +1100 From: Peter Jeremy To: John Refling Subject: Re: rare, random issue with read(), mmap() failing to read entire file Message-ID: <20131118191417.GA75443@server.rulingia.com> References: <9CB46A22C0BE40029652144B2586462A@d40> MIME-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="qMm9M+Fa2AknHoGS" Content-Disposition: inline In-Reply-To: <9CB46A22C0BE40029652144B2586462A@d40> X-PGP-Key: http://www.rulingia.com/keys/peter.pgp User-Agent: Mutt/1.5.21 (2010-09-15) Cc: freebsd-fs@freebsd.org, freebsd-questions@freebsd.org X-BeenThere: freebsd-fs@freebsd.org X-Mailman-Version: 2.1.16 Precedence: list List-Id: Filesystems List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 18 Nov 2013 19:14:33 -0000 --qMm9M+Fa2AknHoGS Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On 2013-Nov-15 18:56:09 -0800, John Refling wrote: >I'm having some very insidious issues with copying and verifying (identica= l) >data from several hard disks. This might be a hardware issue or something >very deep in the disk / filesystem code. I have verified this with several >disks and motherboards. It corrupts 0.0096% of my files, different files >each time! My gut feeling is that this is a hardware issue. Since you've tried different systems, that would seem to rule them out. Have you tried different USB enclosures/cables/etc? I'm never comfortable running disks over USB. Are you able to try ZFS? It inherently checksums data and should quickly show up any hardware issues. --=20 Peter Jeremy --qMm9M+Fa2AknHoGS Content-Type: application/pgp-signature -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.21 (FreeBSD) iKYEARECAGYFAlKKZwlfFIAAAAAALgAoaXNzdWVyLWZwckBub3RhdGlvbnMub3Bl bnBncC5maWZ0aGhvcnNlbWFuLm5ldDBCRjc3QTcyNTg5NEVCRTY0RjREN0VFRUZF OEE0N0JGRjAwRkI4ODcACgkQ/opHv/APuIeBdQCeKmyMSw9iiFi0B83UUeExuzbd GnwAoLd6UbjK0Ghqazi5ohFWG425TwpK =FiR3 -----END PGP SIGNATURE----- --qMm9M+Fa2AknHoGS--