From owner-freebsd-fs@FreeBSD.ORG Tue Feb 5 17:22:39 2008 Return-Path: Delivered-To: freebsd-fs@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 95B1A16A41A for ; Tue, 5 Feb 2008 17:22:39 +0000 (UTC) (envelope-from des@des.no) Received: from tim.des.no (tim.des.no [194.63.250.121]) by mx1.freebsd.org (Postfix) with ESMTP id 4C8C013C461 for ; Tue, 5 Feb 2008 17:22:39 +0000 (UTC) (envelope-from des@des.no) Received: from tim.des.no (localhost [127.0.0.1]) by spam.des.no (Postfix) with ESMTP id D38C02083; Tue, 5 Feb 2008 18:22:30 +0100 (CET) X-Spam-Tests: AWL X-Spam-Learn: disabled X-Spam-Score: -0.3/3.0 X-Spam-Checker-Version: SpamAssassin 3.2.3 (2007-08-08) on tim.des.no Received: from ds4.des.no (des.no [80.203.243.180]) by smtp.des.no (Postfix) with ESMTP id C61502082; Tue, 5 Feb 2008 18:22:30 +0100 (CET) Received: by ds4.des.no (Postfix, from userid 1001) id AC4B4844B3; Tue, 5 Feb 2008 18:22:30 +0100 (CET) From: =?utf-8?Q?Dag-Erling_Sm=C3=B8rgrav?= To: Joe Peterson References: <47A73C8D.3000107@skyrush.com> <86prvby5o1.fsf@ds4.des.no> <47A864D9.4060504@skyrush.com> <864pcnxz8f.fsf@ds4.des.no> <47A88ADE.7050503@skyrush.com> Date: Tue, 05 Feb 2008 18:22:30 +0100 In-Reply-To: <47A88ADE.7050503@skyrush.com> (Joe Peterson's message of "Tue\, 05 Feb 2008 09\:12\:14 -0700") Message-ID: <86abmfwc6h.fsf@ds4.des.no> User-Agent: Gnus/5.110006 (No Gnus v0.6) Emacs/22.1 (berkeley-unix) MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable Cc: freebsd-fs@freebsd.org Subject: Re: Forcing full file read in ZFS even when checksum error encountered X-BeenThere: freebsd-fs@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Filesystems List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 05 Feb 2008 17:22:39 -0000 Joe Peterson writes: > Dag-Erling Sm=C3=B8rgrav writes: > > There is now way to "read the bad data" since an unrecoverable > > checksum error means that ZFS has no idea which of the multiple > > version of the affected block is the right one. > Nope, no mirror, no RAIDZ - just one partition. But as far as I know, th= ere > were no read errors, just a checksum error. A checksum error results from a read error. Check your drive's SMART error log if it has one. It might not be detectable in a surface scan, as the damaged sector will be automatically reassigned if it's written to (which ZFS may very well have done) DES --=20 Dag-Erling Sm=C3=B8rgrav - des@des.no