From owner-freebsd-stable@FreeBSD.ORG Fri Nov 9 11:18:52 2012 Return-Path: Delivered-To: stable@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [69.147.83.52]) by hub.freebsd.org (Postfix) with ESMTP id 008D2122 for ; Fri, 9 Nov 2012 11:18:51 +0000 (UTC) (envelope-from hingow@gmail.com) Received: from mail-bk0-f54.google.com (mail-bk0-f54.google.com [209.85.214.54]) by mx1.freebsd.org (Postfix) with ESMTP id 732458FC0A for ; Fri, 9 Nov 2012 11:18:50 +0000 (UTC) Received: by mail-bk0-f54.google.com with SMTP id jm19so511240bkc.13 for ; Fri, 09 Nov 2012 03:18:49 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=date:from:to:subject:message-id:mime-version:content-type :content-disposition:user-agent; bh=cl7Wu6y+T4QRIYwZ82n/ITQa0e5SutGQJ4keOA6IZ3A=; b=Ssm/qVbgOyWTmIdApUgQdot0ARdTwSe34Az2iMXqPKohlWPV/14NQvUiG/17V50bJ9 qRBpeWwYgje/5RpP9PCFljXP02chlXM9HILjOJhTOq614+adS1LOA5wA2N+GtT2Ce8qw PGC7L0ZGt5XeAOxsJ3sTU96dxh/Z1v+64QRmW4XGvpTMq66pwO1IeUKQ0JNNtIzFQzsW HVXK0135u31zAD+I+/75vLd+Wmj5Jk9l+N8PjdSBJLUpVmbm/Je0530EgrmfwsGmMMhL 1Ve/5+lIZsgPdgf2kNQ26YtSOoEhivk3P6JyLyUoMruYLvLJIb1uCKAEVUUSorVD36lc joFg== Received: by 10.204.152.75 with SMTP id f11mr1664924bkw.23.1352459929530; Fri, 09 Nov 2012 03:18:49 -0800 (PST) Received: from mickey ([2a01:1e8:e100:82ac::91]) by mx.google.com with ESMTPS id z22sm18760737bkw.2.2012.11.09.03.18.47 (version=TLSv1/SSLv3 cipher=OTHER); Fri, 09 Nov 2012 03:18:48 -0800 (PST) Received: from [2a01:1e8:e100:82ac::91] (helo=localhost) by mickey with esmtp (Exim 4.80 (FreeBSD)) (envelope-from ) id 1TWmbk-00075T-4q for stable@FreeBSD.org; Fri, 09 Nov 2012 11:18:44 +0000 Date: Fri, 9 Nov 2012 12:18:43 +0100 From: "H. Ingow" To: stable@FreeBSD.org Subject: smartctl question Message-ID: <20121109111843.GA25461@tunchi> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.5.21 (2010-09-15) X-BeenThere: freebsd-stable@freebsd.org X-Mailman-Version: 2.1.14 Precedence: list List-Id: Production branch of FreeBSD source code List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 09 Nov 2012 11:18:52 -0000 Hi all, one single disk in a zfs mirror failed permanently throwing errors like kernel: (ada5:ata10:0:0:0): ATA status: 51 (DRDY SERV ERR), error: 84 (ICRC ABRT ) and alike. The pool itself continued working degraded, smartctl showed a very high 199 UDMA_CRC_Error_Count value, which to my knowledge may indicate a broken cable, in this case indeed a cable replacement solved the problem, the pool resilvered and all is fine. Still smartctl -a displays a value of 199 UDMA_CRC_Error_Count I reckon to be way too high, though ( > 3900 ) . So is this value now including errors from previous broken cable ? In other words, when, if at all, is the cache smartmontools read from flushed and values are to be taken as of the status after fixing a hardware problem but not swapping the disk ? Can someone please share some insight ? thanks