Date: Mon, 12 Oct 1998 21:27:56 +0200 From: Stefan Eggers <seggers@semyam.dinoco.de> To: Alfred Perlstein <bright@hotjobs.com> Cc: Zach Heilig <zach@gaffaneys.com>, current@FreeBSD.ORG, seggers@semyam.dinoco.de Subject: Re: wd, crash dumps and strange geometries (was: Re: bitten 3 times already. ) Message-ID: <199810121927.VAA26752@semyam.dinoco.de> In-Reply-To: Your message of "Mon, 12 Oct 1998 20:25:16 %2B0200." <199810121825.UAA04383@semyam.dinoco.de>
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> you use the geometry for 15 heads the CHS addressing will be wrong and > maybe this is what somehow caused the failure you saw. I looked at where exactly the system puts the crash dump. At the *end* of the partition you give it. With 15 heads you get to larger cylinders (nearer your /usr) faster than with the correct 16 heads so what happens I suppose is that it overwrites most of the start of /usr due to taking the wrong geometry. I am pretty convinced that using the same mode for crash dumps as for normal block reads/writes prevents this kind of disaster. Maybe some- one can commit a fix? Or shall I send a PR with my suggestion in- stead? Why was it that one put the at partitions end in the first place? Am I right when I guess it was so that one could enable swapping, do a little bit of it and still get reasonable crash dumps? Stefan. -- Stefan Eggers Lu4 yao2 zhi1 ma3 li4, Max-Slevogt-Str. 1 ri4 jiu3 jian4 ren2 xin1. 51109 Koeln Federal Republic of Germany To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-current" in the body of the message
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