Date: Wed, 16 Jul 2003 18:15:38 +0400 From: "Andrew L. Neporada" <andr@dgap.mipt.ru> To: Avleen Vig <lists-freebsd@silverwraith.com> Cc: hackers@freebsd.org Subject: Re: 4.8 panic "ffs_clusteralloc: map mismatch" Message-ID: <20030716141538.GA81724@nas.dgap.mipt.ru> In-Reply-To: <20030716125744.GI68950@silverwraith.com> References: <20030716125744.GI68950@silverwraith.com>
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On Wed, Jul 16, 2003 at 05:57:44AM -0700, Avleen Vig wrote: > > Andrew, > > I spend about two to three years fighting with a system trying to figure > out what was wrong, and why these errors were caused. I got the very > same crashes you're seeing now. > I'm sure others are too, and I think this reply would be useful for the > archives. > > My Solution: > I eventually realised that my problem was with one of three things: > 1) bit flips in main memory > 2) bit flips in cache > 3) bad hard drive > > I replaced all of the memory after a few months. The problems stopped > for a few weeks but quickly returned. So I don't think it was main > memory, unless the new set or the sockets were damaged. > I couldn't replace the cache because I couldn't find any more. The > system was an old P1 (originally 75Mhz). This could have been the > problem. My system has brand new MB (supermicro dual proc mainbord with U160 SCSI & fxp NIC integrated), P3 processor & memory (btw, ECC memory). Other components are not-so-new, but they worked flawlessly for about a year with another MB. > I did once try turning off L2 cache in the BIOS, and I think the crashes > *might* have continued. So it's possible the problems were here. > > Finally I didn't replace the hard drive, but I did find that moving load > off the original drive to a second drive helpped reduce the number of > crashes, although they still continued to happen. > > HTH. > > -- > Avleen Vig "Say no to cheese-eating surrender-monkeys" > Systems Admin "Fast, Good, Cheap. Pick any two." > www.silverwraith.com "Move BSD. For great justice!" Andrew.
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