Date: Fri, 6 Dec 2002 13:10:27 -0600 From: Dan Nelson <dnelson@allantgroup.com> To: David Rhodus <david@uky.edu> Cc: Archie Cobbs <archie@dellroad.org>, Kirk McKusick <mckusick@beastie.mckusick.com>, freebsd-current@FreeBSD.ORG Subject: Re: backgroud fsck is still locking up system (fwd) Message-ID: <20021206191024.GA1646@dan.emsphone.com> In-Reply-To: <D414C546-094B-11D7-883E-0050E460845F@uky.edu> References: <200212061839.gB6Id3Bn064745@arch20m.dellroad.org> <D414C546-094B-11D7-883E-0050E460845F@uky.edu>
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In the last episode (Dec 06), David Rhodus said: > Why does softupdates not get enabled on / , by default on the > install? Softupdates updates on-disk structures in the background, and background fsck cannot relink unreferenced files into lost+found, so you run the risk of losing both the original and backup copies of important files in case of a sudden reboot. Imagine you edited /etc/rc.conf, saved it, and 5 seconds later the system panic'ed. Because the default metadata flush time is 28 seconds, there's a pretty good chance that neither the new file or the original is in /etc after a reboot. I got bit by this three times before I learned my lesson. I have disable softupdates on /, and crank the softupdates delays down to 10/11/12 seconds to minimize the risk to my other filesystems. At least there are /var/backups and /boot/kernel.old which let you recover the really important files :) -- Dan Nelson dnelson@allantgroup.com To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-current" in the body of the message
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