Date: 08 Jul 2001 20:29:06 +0200 From: Dag-Erling Smorgrav <des@ofug.org> To: "Dave Uhring" <duhring@charter.net> Cc: "Jim C. Nasby" <jim@nasby.net>, <freebsd-stable@FreeBSD.ORG>, "Oliver Fromme" <olli@secnetix.de> Subject: Re: JFS Message-ID: <xzp66d3s2a5.fsf@flood.ping.uio.no> In-Reply-To: <000d01c1074e$49d31ba0$0300a8c0@uhring.com> References: <200107071638.SAA19610@lurza.secnetix.de> <01070711475500.00362@dave> <3B476285.43347BA1@nasby.net> <000d01c1074e$49d31ba0$0300a8c0@uhring.com>
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"Dave Uhring" <duhring@charter.net> writes: > 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. In FreeBSD-CURRENT, this is done in the background after the file system is mounted - and the only corruption possible (except in case of hardware failure, or loss of power to a disk that has write cacheing enabled) is having blocks marked as allocated when they're not. I also suspect that fsck is considerably slower than it needs to be, and that this could be fixed by a careful rewrite of certain key routines. While we're discussing journaling file systems, Sistina Software (http://www.sistina.com/) have something called GFS (Global File System) which is a distributed / shared-media file system which can also function as a local journalled file system. They've already expressed interest in porting it to FreeBSD, and I believe part of the work has already been done, but the Sistina employee who was working on this appears to have quit. The GFS FAQ still says that "The first GFS port will probably be to FreeBSD." Sistina also make a volume manager called LVM (Logical Volume Manager) which they claim "has become a de-facto standard for storage management across UNIX implementations", though it's still very much in BETA and only runs on Linux, so I'm not sure what they mean by "de-facto standard". DES -- Dag-Erling Smorgrav - des@ofug.org To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-stable" in the body of the message
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