Date: Wed, 22 Feb 2012 07:50:42 +0700 From: Erich Dollansky <erichfreebsdlist@ovitrap.com> To: freebsd-questions@freebsd.org Cc: David Brodbeck <gull@gull.us> Subject: Re: One or Four? Message-ID: <201202220750.42925.erichfreebsdlist@ovitrap.com> In-Reply-To: <CAHhngE3fWXuoOL0_pM=3Hx-YeOg%2BY_MuzoXobG2z22XsnkDuNA@mail.gmail.com> References: <4F3ECF23.5000706@fisglobal.com> <201202191226.47196.erichfreebsdlist@ovitrap.com> <CAHhngE3fWXuoOL0_pM=3Hx-YeOg%2BY_MuzoXobG2z22XsnkDuNA@mail.gmail.com>
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Hi, On Wednesday 22 February 2012 02:48:21 David Brodbeck wrote: > On Sat, Feb 18, 2012 at 9:26 PM, Erich Dollansky > <erichfreebsdlist@ovitrap.com> wrote: > > it will not even boot if there is only a single slice with root and the rest on it if the background fsck cannot be run. > > > > I have to go to real remote locations once in a while where an USP is not of real help anymore as the USP is not able to charge its battery before the next power failure comes. It happened there some times that the /usr slice needs a foreground check. Of course, all can be fixed. > > > > I cannot imagine that this would still work if / is on the same slice as the rest of the data. > > Why not? / gets mounted read-only, foreground fsck is run on /, system boots... > > Maybe I'm just not understanding the problem here. I suppose in > theory your root filesystem could be so corrupt that it won't even > mount read-only, but I've never actually seen that happen except in > the case of an outright disk failure. it happened to me under very strange circumstances. I was in a location with extremely bad power supply where even an USP has had problems recharging far enough to allow for a decent shutdown. I believe that main cause was that the last power failure occurred when fsck was running shortly after a reboot. As a result, only / got mounted. I have had to run a foreground fsck on the affected slices. It did not just happen once but several times. It did not happen to me since the switch to 6 many years ago. So, it is something rare, but it exists. Erich
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