From owner-freebsd-stable@FreeBSD.ORG Fri Aug 19 21:52:02 2011 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 C6781106564A for ; Fri, 19 Aug 2011 21:52:02 +0000 (UTC) (envelope-from cswiger@mac.com) Received: from asmtpout025.mac.com (asmtpout025.mac.com [17.148.16.100]) by mx1.freebsd.org (Postfix) with ESMTP id AFFAC8FC08 for ; Fri, 19 Aug 2011 21:52:02 +0000 (UTC) MIME-version: 1.0 Content-transfer-encoding: 7BIT Content-type: text/plain; CHARSET=US-ASCII Received: from [17.153.44.144] by asmtp025.mac.com (Oracle Communications Messaging Exchange Server 7u4-20.01 64bit (built Nov 21 2010)) with ESMTPSA id <0LQ7000ZO3DZCG70@asmtp025.mac.com> for freebsd-stable@freebsd.org; Fri, 19 Aug 2011 14:51:37 -0700 (PDT) X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10432:5.4.6813,1.0.211,0.0.0000 definitions=2011-08-19_08:2011-08-19, 2011-08-19, 1970-01-01 signatures=0 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 spamscore=0 ipscore=0 suspectscore=0 phishscore=0 bulkscore=0 adultscore=0 classifier=spam adjust=0 reason=mlx engine=6.0.2-1012030000 definitions=main-1108190264 From: Chuck Swiger In-reply-to: <1B4FC0D8-60E6-49DA-BC52-688052C4DA51@langille.org> Date: Fri, 19 Aug 2011 14:51:34 -0700 Message-id: <65474D95-F56F-4DC7-8029-BA7166C4E46F@mac.com> References: <1B4FC0D8-60E6-49DA-BC52-688052C4DA51@langille.org> To: Dan Langille X-Mailer: Apple Mail (2.1084) Cc: freebsd-stable@freebsd.org Subject: Re: bad sector in gmirror HDD 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: Fri, 19 Aug 2011 21:52:02 -0000 On Aug 19, 2011, at 1:50 PM, Dan Langille wrote: > Searching on that error message, I was led to believe that identifying the bad sector and > running dd to read it would cause the HDD to reallocate that bad block. > > http://smartmontools.sourceforge.net/badblockhowto.html > > However, since ad2 is one half of a gmirror, I don't think this is the best approach. > > Comments? Reading the underlying failing drive with dd will help identify any other questionable sectors. However, your drive temps are too high-- many vendors call out either 50C or 55C as the point where drive reliability becomes significantly degraded. Regards, -- -Chuck