Date: Thu, 20 Aug 2009 12:13:46 +0300 From: Sebastian Seidl <seba@sebaseidl.com> To: Erik Norgaard <norgaard@locolomo.org> Cc: questions@freebsd.org Subject: Re: Recovering files after a crash Message-ID: <4A8D13CA.7090504@sebaseidl.com> In-Reply-To: <4A8CFCC5.4070303@locolomo.org> References: <4A8A5887.1080304@locolomo.org> <20090818171528.GA35403@slackbox.xs4all.nl> <4A8BB0E4.2020806@locolomo.org> <20090819160956.GA71105@slackbox.xs4all.nl> <4A8CFCC5.4070303@locolomo.org>
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Erik Norgaard wrote: > Roland Smith wrote: >> On Wed, Aug 19, 2009 at 09:59:32AM +0200, Erik Norgaard wrote: >>> Thanks, I couldn't decipher these GEOM_LABEL messages, nice to know >>> that I can stop worrying. But for future incidents, the second >>> question remains: >>> >>> 1. How do I best protect my system from disk errors in case of a crash? >> >> One word: _backups_! >> >>> I have a headless system with no spare head to attach and doing >>> single-user blind-folded is further complicated by the fact that I'm >>> not native to the US keyboard layout, so my top priority is that it >>> boots. >> >> If you can connect it to another system (that has a monitor) via a >> serial >> null-modem cable and you enable the serial console (see the >> Handbook), you can >> watch the boot process from the other system. >> >> If you don't have anothe machine closeby, you should get a >> network-accessible >> KVM switch with serial connectors. [maybe something like this: >> http://www.knuerr.com/web/en/products/kvm/kvm-switch-dominion-ksx.html] >> With such a switch and the serial console you should be able to watch >> the boot >> of the machine remotely. > > Ok, maybe I didn't make myself clear: I wish to protect my filesystem > against corruption in case of a crash such that it will boot. > > - How can I configure my system to reduce the probability that a crash > will cause file system inconsistencies that require single user mode > intervention? > > backups does not answer that question, they are great for recovering > lost data but don't prevent the crash. > > KVM and serial console don't answer the question either. Certainly, it > makes it easier to work headless. But neither prevent disk corruption. > > UPS reduces the likelyhood of a crash in case of a power failure, but > that doesn't answer the question either. > > Asume that a crash will happen, how do I prevent or reduce the risk of > a crash causing disk corruption such that the system will boot up > nicely again? > > BR, Erik If u want to reduce the posibility of data corruption I sugest using a smart UPS with management software installed and configured so that before battery power goes out it will do a clean shutdown and also restart the system when AC power is restored (see apcupsd). That is what I'm using. Regards, Sebastian Seidl
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