Date: Sun, 30 Mar 2008 10:17:02 -0600 From: Karl Denninger <karl@denninger.net> To: freebsd-stable@freebsd.org Subject: Re: gjournal.... Message-ID: <20080330161702.GA8242@FS.denninger.net> In-Reply-To: <20080330090617.GH95731@elvis.mu.org> References: <20080330031017.GA32063@FS.denninger.net> <20080330090617.GH95731@elvis.mu.org>
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On Sun, Mar 30, 2008 at 02:06:17AM -0700, Alfred Perlstein wrote: > * Karl Denninger <karl@denninger.net> [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
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