Date: Tue, 22 Dec 2009 00:01:51 +0000 (GMT) From: Robert Watson <rwatson@FreeBSD.org> To: "Pedro F. Giffuni" <giffunip@tutopia.com> Cc: freebsd-fs@freebsd.org, jeff@FreeBSD.org Subject: Re: Plans for Logged/Journaled UFS Message-ID: <alpine.BSF.2.00.0912220000360.73550@fledge.watson.org> In-Reply-To: <240049.46806.qm@web113517.mail.gq1.yahoo.com> References: <712903.15604.qm@web113517.mail.gq1.yahoo.com> <3612709F-15CA-4A59-86B1-2674BAA2936D@gmail.com> <240049.46806.qm@web113517.mail.gq1.yahoo.com>
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On Mon, 21 Dec 2009, Pedro F. Giffuni wrote: >> gjournal(8) journals everything, that is all data and metadata are >> journaled. Which can help with random writes, but essentially cuts linear >> write throughput in half. > > I recall ext3fs also journals everything by default and still is very > popular. > > I am asking because I've been playing a bit with Aditya's ext2fs (mostly > UFS1) and one of the ideas there is adding gjournal support instead of > starting from scratch. I'm CC'ing Jeff Roberson, who perhaps can comment on his on-going project to merge journaling techniques with soft updates in UFS (which is just meta-data journaling, but hopefully will address many of the fsck/bgfsck-related concerns people have). Robert N M Watson Computer Laboratory University of Cambridge
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