From owner-freebsd-fs@FreeBSD.ORG Sat Aug 23 22:38:33 2003 Return-Path: Delivered-To: freebsd-fs@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 65A6316A4BF for ; Sat, 23 Aug 2003 22:38:33 -0700 (PDT) Received: from mail.wolves.k12.mo.us (duey.wolves.k12.mo.us [207.160.214.9]) by mx1.FreeBSD.org (Postfix) with ESMTP id 9A4D143FE9 for ; Sat, 23 Aug 2003 22:38:32 -0700 (PDT) (envelope-from cdillon@wolves.k12.mo.us) Received: from localhost (localhost [127.0.0.1]) by mail.wolves.k12.mo.us (Postfix) with ESMTP id B18611FE32; Sun, 24 Aug 2003 00:38:31 -0500 (CDT) Received: from mail.wolves.k12.mo.us ([127.0.0.1]) by localhost (duey.wolves.k12.mo.us [127.0.0.1]) (amavisd-new, port 10024) with LMTP id 08191-02; Sun, 24 Aug 2003 00:38:21 -0500 (CDT) Received: by mail.wolves.k12.mo.us (Postfix, from userid 1001) id 2F0ED1FE24; Sun, 24 Aug 2003 00:38:21 -0500 (CDT) Received: from localhost (localhost [127.0.0.1]) by mail.wolves.k12.mo.us (Postfix) with ESMTP id 2B8AA1BC6A; Sun, 24 Aug 2003 00:38:21 -0500 (CDT) Date: Sun, 24 Aug 2003 00:38:21 -0500 (CDT) From: Chris Dillon To: Tony Holmes In-Reply-To: <20030822101702.A73928@crosswinds.net> Message-ID: <20030824002334.E7724@duey.wolves.k12.mo.us> References: <20030822101702.A73928@crosswinds.net> MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII X-Virus-Scanned: by amavisd-new at wolves.k12.mo.us cc: freebsd-fs@FreeBSD.ORG Subject: Re: RAID 1+0 X-BeenThere: freebsd-fs@freebsd.org X-Mailman-Version: 2.1.1 Precedence: list List-Id: Filesystems List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 24 Aug 2003 05:38:33 -0000 On Fri, 22 Aug 2003, Tony Holmes wrote: > I've been running a couple servers using vinum's RAID 5. Last night > I had 2 of the disks in the RAID set drop dead (the first and last > physcial drives) killing all the data on the set. This is not the > first time I've lost all my RAID 5 data due to 2 disks dropping in a > very short period of time (this is the third time actually). If this is a SCSI array, and I assume it is, make sure your termination is correct. After troubleshooting somebody's white-box 10-drive external array when it would consistently drop disks and new replacements would again "drop dead" a few days to weeks later, I noticed the vendor didn't properly terminate either of the two LVD busses. I was totally surprised that it worked at all with a half-terminated bus, but I guess LVD is relatively forgiving compared to SE busses when it comes to termination. Once a terminator was put on the end of each bus (the RAID controller was already terminating the other end), a drive hasn't dropped out in several months. -- Chris Dillon - cdillon(at)wolves.k12.mo.us FreeBSD: The fastest and most stable server OS on the planet - Available for IA32, IA64, PC98, Alpha, and UltraSPARC architectures - x86-64, PowerPC, ARM, MIPS, and S/390 under development - http://www.freebsd.org No trees were harmed in the composition of this message, although some electrons were mildly inconvenienced.