Date: Sun, 24 Aug 2003 00:38:21 -0500 (CDT) From: Chris Dillon <cdillon@wolves.k12.mo.us> To: Tony Holmes <tony@crosswinds.net> Cc: freebsd-fs@FreeBSD.ORG Subject: Re: RAID 1+0 Message-ID: <20030824002334.E7724@duey.wolves.k12.mo.us> In-Reply-To: <20030822101702.A73928@crosswinds.net> References: <20030822101702.A73928@crosswinds.net>
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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.
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