From owner-freebsd-fs Sat Aug 14 14:57:55 1999 Delivered-To: freebsd-fs@freebsd.org Received: from gw-nl3.philips.com (gw-nl3.philips.com [192.68.44.35]) by hub.freebsd.org (Postfix) with ESMTP id 28B2B1525F for ; Sat, 14 Aug 1999 14:57:34 -0700 (PDT) (envelope-from Jos.Backus@nl.origin-it.com) Received: from smtprelay-nl1.philips.com (localhost.philips.com [127.0.0.1]) by gw-nl3.philips.com with ESMTP id XAA23267 for ; Sat, 14 Aug 1999 23:57:53 +0200 (MEST) (envelope-from Jos.Backus@nl.origin-it.com) Received: from smtprelay-eur1.philips.com(130.139.36.3) by gw-nl3.philips.com via mwrap (4.0a) id xma023264; Sat, 14 Aug 99 23:57:53 +0200 Received: from hal.mpn.cp.philips.com (hal.mpn.cp.philips.com [130.139.64.195]) by smtprelay-nl1.philips.com (8.9.3/8.8.5-1.2.2m-19990317) with SMTP id XAA09316 for ; Sat, 14 Aug 1999 23:57:53 +0200 (MET DST) Received: (qmail 36343 invoked by uid 666); 14 Aug 1999 21:58:16 -0000 Date: Sat, 14 Aug 1999 23:58:16 +0200 From: Jos Backus To: Ollivier Robert Cc: freebsd-fs@FreeBSD.ORG Subject: Re: Help with understand file system performance Message-ID: <19990814235816.A36250@hal.mpn.cp.philips.com> Reply-To: Jos Backus References: <19990813152529.G12312@hal.mpn.cp.philips.com> <199908131853.LAA22289@usr09.primenet.com> <19990814105029.A28461@hal.mpn.cp.philips.com> <19990814194422.A13802@keltia.freenix.fr> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii X-Mailer: Mutt 0.95.6i In-Reply-To: <19990814194422.A13802@keltia.freenix.fr>; from Ollivier Robert on Sat, Aug 14, 1999 at 07:44:22PM +0200 Sender: owner-freebsd-fs@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.org On Sat, Aug 14, 1999 at 07:44:22PM +0200, Ollivier Robert wrote: > If you mean LFS then no. LFS is a log file system (the entire FS is a log) > whereas JFS is a journalling FS (i.e. a FS with a journal). They're quite > different beasts. OK, point taken. As I understand it, jfs uses a log aka journal (usually hd8, type jfslog, in the std rootvg after installation) to prerecord metadata updates for the logical volumes in that volume group. I'm sure there's more to it but that's all I can remember now. Reading the paper by Margo Seltzer on LFS is still on my todo list. Cheers, -- Jos Backus _/ _/_/_/ "Reliability means never _/ _/ _/ having to say you're sorry." _/ _/_/_/ -- D. J. Bernstein _/ _/ _/ _/ Jos.Backus@nl.origin-it.com _/_/ _/_/_/ use Std::Disclaimer; To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-fs" in the body of the message