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Date:      Tue, 06 Oct 1998 12:32:26 +0200
From:      Stefan Eggers <seggers@semyam.dinoco.de>
To:        Karl Pielorz <kpielorz@caladan.tdx.co.uk>
Cc:        Greg Lehey <grog@lemis.com>, current@FreeBSD.ORG, seggers@semyam.dinoco.de
Subject:   crash dumps (was: Re: Panic with heavy diskaccess - current as of 10/04/98 )
Message-ID:  <199810061032.MAA01321@semyam.dinoco.de>
In-Reply-To: Your message of "Mon, 05 Oct 1998 10:18:34 BST." <Pine.BSF.4.05.9810051013470.283-100000@caladan.tdx.co.uk> 

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> > > The panic details are below - I've heard nasty things about crashdumps at
> > > the moment - are these safe to enable now?
> > 
> > I haven't seen any problems.  What have you seen?
> 
> People were complaining they were overwriting volumes, and not writing to
> the crash device specified... :-(

I've seen one person having this problem as far as I remember and I
think in a newer mail it looked more like this was just a pilot error.
After that I reenabled them.

The only thing which I think might be a serious problem is if you
choose a dump device where there is not enough space.  dumpon(8) says
one has to have 64 KByte more space there than one has main memory.
Doing this wrong shouldn't be fatal I think as sd and wd seem to check
for having too few space and don't dump in such a case.

Stefan.
-- 
Stefan Eggers                 Lu4 yao2 zhi1 ma3 li4,
Max-Slevogt-Str. 1            ri4 jiu3 jian4 ren2 xin1.
51109 Koeln
Federal Republic of Germany

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