From owner-freebsd-stable@FreeBSD.ORG Sun Mar 30 16:17:07 2008 Return-Path: Delivered-To: freebsd-stable@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 50EB0106566B for ; Sun, 30 Mar 2008 16:17:07 +0000 (UTC) (envelope-from karl@FS.denninger.net) Received: from FS.denninger.net (wsip-70-169-168-7.pn.at.cox.net [70.169.168.7]) by mx1.freebsd.org (Postfix) with ESMTP id EA9BA8FC24 for ; Sun, 30 Mar 2008 16:17:06 +0000 (UTC) (envelope-from karl@FS.denninger.net) Received: from fs.denninger.net (localhost [127.0.0.1]) by FS.denninger.net (8.14.2/8.13.1) with SMTP id m2UGH2Y5009073 for ; Sun, 30 Mar 2008 10:17:02 -0600 (CST) (envelope-from karl@FS.denninger.net) Received: from fs.denninger.net [127.0.0.1] by Spamblock-sys (LOCAL); Sun Mar 30 10:17:02 2008 Received: (from karl@localhost) by FS.denninger.net (8.14.2/8.13.1/Submit) id m2UGH25R009066 for freebsd-stable@freebsd.org; Sun, 30 Mar 2008 10:17:02 -0600 (CST) (envelope-from karl) Date: Sun, 30 Mar 2008 10:17:02 -0600 From: Karl Denninger To: freebsd-stable@freebsd.org Message-ID: <20080330161702.GA8242@FS.denninger.net> Mail-Followup-To: freebsd-stable@freebsd.org References: <20080330031017.GA32063@FS.denninger.net> <20080330090617.GH95731@elvis.mu.org> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20080330090617.GH95731@elvis.mu.org> User-Agent: Mutt/1.4.2.1i Organization: Karl's Sushi and Packet Smashers X-Die-Spammers: Spammers cheerfully broiled for supper and served with ketchup! Subject: Re: gjournal.... X-BeenThere: freebsd-stable@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Production branch of FreeBSD source code List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 30 Mar 2008 16:17:07 -0000 On Sun, Mar 30, 2008 at 02:06:17AM -0700, Alfred Perlstein wrote: > * Karl Denninger [080329 20:10] wrote: > > Hi folks; > > > > Wondering about the various pros and cons of using the "gjournal" GEOM > > provider... and if you can "promote" and existing system using it, or > > whether you need to build something anew. > > > > The scenario is a fairly busy and large system with PostgreSQL database data > > on it. The data is currently on a 2-disk gmirror pair to provide data > > safety in the event of a disk failure. > > > > I am using softupdates right now. > > > > If I'm reading the docs correctly, I can't put gjournal in use on the > > existing filesystem, and need to effectively build a new disk structure then > > copy over the data onto it. > > > > Can you boot from a gjournal'd root? > > > > Ideas please, pros and cons of the various alternatives, etc..... thanks! > > > > If you're using a database then it shouldn't matter what meta data > provider you use "all that much" with the exception of temporary > tables. > > Basically, SU and gjournal both provide for meta data consistency, > something that a database rarely needs as it rarely creates/deletes > files often. > I'm looking at this more from a performance standpoint. Is there a performance advantage to using gjournal over a "normal" UFS/UFS2 filesystem with softupdates? -- -- Karl Denninger (karl@denninger.net) Internet Consultant & Kids Rights Activist http://www.denninger.net My home on the net - links to everything I do! http://scubaforum.org Your UNCENSORED place to talk about DIVING! http://genesis3.blogspot.com Musings Of A Sentient Mind