Date: Fri, 11 Mar 2005 09:44:10 -0600 From: Stephen Montgomery-Smith <stephen@math.missouri.edu> To: Bob Johnson <bob89@eng.ufl.edu> Cc: freebsd-stable@freebsd.org Subject: Re: Panic - cannot get a dump Message-ID: <4231BCCA.5080306@math.missouri.edu> In-Reply-To: <4231B362.5070800@eng.ufl.edu> References: <4231B362.5070800@eng.ufl.edu>
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Bob Johnson wrote: > > Any chance your RAID array is built from two-year-old Western Digital > drives? Your problem sounds a lot like the one discussed here: > http://adam.kungfoohampster.com/lists/freebsd-questions/msg18877.shtml > > The message above doesn't mention it, but the WD KB article also > includes a fix for drives on 3Ware controllers. > Probably this is not the problem. I have Seagate drives, and the symptoms seem to be different - I have a panic, not a freeze. Although I am having problems with the disk when I reboot. The program I am running outputs a "data.check" file every second or so, so that when the program is restarted it can pick up where it left. The code to do this is something like check_point = open("data.check-tmp",O_WRONLY|O_TRUNC|O_CREAT,0644); write(check_point,lots-of-stuff); close(check_point); rename("data.check-tmp","data.check"); What I find is that after the panic the file "data.check" is several days old. I am guessing it is because the IDE Seagate disk has some cache that it doesn't write back to the disk - probably it is the directory itself which is not properly updated. It is a bit annoying, but I can live with this. But maybe this indicates something more sinister. I have put in another IDE disk whose only purpose is to be the disk to dump to. Hopefully I will be able to catch a good dump on that. -- Stephen Montgomery-Smith stephen@math.missouri.edu http://www.math.missouri.edu/~stephen
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