Date: Sun, 30 Mar 2008 02:06:17 -0700 From: Alfred Perlstein <alfred@freebsd.org> To: freebsd-stable@freebsd.org Subject: Re: gjournal.... Message-ID: <20080330090617.GH95731@elvis.mu.org> In-Reply-To: <20080330031017.GA32063@FS.denninger.net> References: <20080330031017.GA32063@FS.denninger.net>
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* 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. -- - Alfred Perlstein
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