From owner-freebsd-questions Sun Apr 1 17:41:40 2001 Delivered-To: freebsd-questions@freebsd.org Received: from guru.mired.org (okc-65-26-235-186.mmcable.com [65.26.235.186]) by hub.freebsd.org (Postfix) with SMTP id 3DE3137B71A for ; Sun, 1 Apr 2001 17:41:38 -0700 (PDT) (envelope-from mwm@mired.org) Received: (qmail 25590 invoked by uid 100); 2 Apr 2001 00:41:37 -0000 From: Mike Meyer MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Message-ID: <15047.51905.378804.46171@guru.mired.org> Date: Sun, 1 Apr 2001 19:41:37 -0500 To: "Charles Burns" Cc: questions@freebsd.org, mail@krel.org Subject: Re: journaling file system In-Reply-To: <115704931@toto.iv> X-Mailer: VM 6.89 under 21.1 (patch 14) "Cuyahoga Valley" XEmacs Lucid X-face: "5Mnwy%?j>IIV\)A=):rjWL~NB2aH[}Yq8Z=u~vJ`"(,&SiLvbbz2W`;h9L,Yg`+vb1>RG% *h+%X^n0EZd>TM8_IB;a8F?(Fb"lw'IgCoyM.[Lg#r\ Sender: owner-freebsd-questions@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.ORG Charles Burns types: > Technically no, but the main reason to use a journaling FS is for stability > in the face of adversity (such as when power is lost in the middle of a > write) > I have tested UFS (The FreeBSD filesystem) several times by killing the > power during a write. It has never lost data as far as I can tell, and is > certainly a much mor estable filesystem than EXT2 (the reason Journaling is > such a buzzword) or FATxx (the infamous awful filesystem of the Microsoft > world) > With SoftUpdates, UFS is the second fastest filesystem that I have ever > used, second to Irix's filesystem. (Speed measured with streaming large > files, UFS probably beats Irix with many smaller files) > If you need extreme filesystem stability, UFS set to write synchronously is > stable enough to trust with a mission-critical system Of course, you should > also have at least one UPS on that mission critical system too. ;) One of the things a journalling file system buys you is quick recovery after a crash. The snapshots facility - still in development - will add that to the mix for ffs (the other name for the BSD file system). http://www.mired.org/home/mwm/ Independent WWW/Perforce/FreeBSD/Unix consultant, email for more information. To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message