Date: Sun, 8 Jul 2001 14:23:18 +0930 From: Greg Lehey <grog@FreeBSD.org> To: Dave Duchscher <daved@tamu.edu> Cc: Dave Uhring <duhring@charter.net>, "Jim C. Nasby" <jim@nasby.net>, freebsd-stable@FreeBSD.ORG, Oliver Fromme <olli@secnetix.de> Subject: Re: JFS Message-ID: <20010708142318.V80862@wantadilla.lemis.com> In-Reply-To: <20010707185753.B27481@net.tamu.edu>; from daved@tamu.edu on Sat, Jul 07, 2001 at 06:57:53PM -0500 References: <200107071638.SAA19610@lurza.secnetix.de> <01070711475500.00362@dave> <3B476285.43347BA1@nasby.net> <000d01c1074e$49d31ba0$0300a8c0@uhring.com> <20010707185753.B27481@net.tamu.edu>
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On Saturday, 7 July 2001 at 18:57:53 -0500, Dave Duchscher wrote: > On Sat, Jul 07, 2001 at 08:35:35PM -0500, Dave Uhring wrote: >> >> You seem to have missed the critical point of that paper. When the >> system goes completely haywire and either crashes or locks up so hard >> that a manual reset is required, UFS/softupdates requires a substantial >> amount of time to run fsck. If you have a very large filesystem, you >> then have to w....a....i....t until fsck completes. And if you are >> lucky, it will not terminate with the suggestion that you run fsck by >> hand. With a true journalling filesystem this wait is obviated. The >> last transactions are rerun or truncated and the system boots up. > > Just to bring up a point, Softupdates will also avoid the long fsck at > boot. If I understand the papers I have read and with playing with > Softupdates on current, Softupdates leaves files system in a > consistent state so that the file-system can be mounted after a > crash/lockup/etc immediately and only a background fsck need be run to > free up left over pieces laying around. You're thinking of snapshotting, not soft updates. Greg -- See complete headers for address and phone numbers To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-stable" in the body of the message
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