From owner-freebsd-stable@FreeBSD.ORG Mon Aug 11 07:15:39 2008 Return-Path: Delivered-To: freebsd-stable@FreeBSD.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id D2A25106564A for ; Mon, 11 Aug 2008 07:15:39 +0000 (UTC) (envelope-from tom.hurst@clara.net) Received: from spork.qfe3.net (spork.qfe3.net [212.13.207.101]) by mx1.freebsd.org (Postfix) with ESMTP id 90DF28FC1E for ; Mon, 11 Aug 2008 07:15:39 +0000 (UTC) (envelope-from tom.hurst@clara.net) Received: from [81.104.123.28] (helo=voi.aagh.net) by spork.qfe3.net with esmtp (Exim 4.66 (FreeBSD)) (envelope-from ) id 1KSRME-000Bxs-Po; Mon, 11 Aug 2008 07:58:22 +0100 Received: from freaky by voi.aagh.net with local (Exim 4.69 (FreeBSD)) (envelope-from ) id 1KSRME-000Lfp-Iq; Mon, 11 Aug 2008 07:58:22 +0100 Date: Mon, 11 Aug 2008 07:58:22 +0100 From: Thomas Hurst To: Larry Rosenman Message-ID: <20080811065822.GA81972@voi.aagh.net> Mail-Followup-To: Larry Rosenman , freebsd-stable@FreeBSD.org References: <20080810175934.X2427@borg> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20080810175934.X2427@borg> Organization: Not much. User-Agent: Mutt/1.5.18 (2008-05-17) Sender: Thomas Hurst Cc: freebsd-stable@FreeBSD.org Subject: Re: ICRC's X-BeenThere: freebsd-stable@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Production branch of FreeBSD source code List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 11 Aug 2008 07:15:39 -0000 * Larry Rosenman (ler@lerctr.org) wrote: > I'm getting the following on a zpool scrub: > > ad8: WARNING - READ_DMA UDMA ICRC error (retrying request) LBA=54817587 > ad8: WARNING - READ_DMA UDMA ICRC error (retrying request) LBA=187521229 > ad8: WARNING - READ_DMA UDMA ICRC error (retrying request) LBA=187522189 > ad8: WARNING - READ_DMA UDMA ICRC error (retrying request) LBA=109095258 > ad8: WARNING - READ_DMA UDMA ICRC error (retrying request) LBA=101327859 > ad8: WARNING - READ_DMA UDMA ICRC error (retrying request) LBA=172911744 > ad8: WARNING - READ_DMA UDMA ICRC error (retrying request) LBA=65393370 > ad8: WARNING - READ_DMA UDMA ICRC error (retrying request) LBA=64741875 > ad8: WARNING - READ_DMA UDMA ICRC error (retrying request) LBA=262496999 > ad8: WARNING - READ_DMA UDMA ICRC error (retrying request) LBA=154593293 > > NAME STATE READ WRITE CKSUM > ad8 ONLINE 0 0 17 Having just experienced NTFS corruption in Windows thanks to a slightly kinked SATA cable (hint: *never* chkdsk/fsck/etc until you're sure the cables are fine), I would *love* to know why this causes a checksum error at ZFS level rather than a read error that any filesystem (or indeed RAID layer) will notice. What's the point in having the connection protected by a CRC if it's just going to let bogus data through anyway? -- Thomas 'Freaky' Hurst http://hur.st/