From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from relay.sgi.com (relay1.corp.sgi.com [137.38.102.111]) by oss.sgi.com (Postfix) with ESMTP id 9CDC87F4E for ; Sun, 21 Dec 2014 16:19:02 -0600 (CST) Received: from cuda.sgi.com (cuda3.sgi.com [192.48.176.15]) by relay1.corp.sgi.com (Postfix) with ESMTP id 8B6628F8035 for ; Sun, 21 Dec 2014 14:18:59 -0800 (PST) Received: from ipmail04.adl6.internode.on.net (ipmail04.adl6.internode.on.net [150.101.137.141]) by cuda.sgi.com with ESMTP id PbIsN9OamHb9G7U6 for ; Sun, 21 Dec 2014 14:18:57 -0800 (PST) Date: Mon, 22 Dec 2014 09:18:53 +1100 From: Dave Chinner Subject: Re: finobt option for end user Message-ID: <20141221221853.GG24183@dastard> References: MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: List-Id: XFS Filesystem from SGI List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: xfs-bounces@oss.sgi.com Sender: xfs-bounces@oss.sgi.com To: Alphazo Cc: xfs@oss.sgi.com On Sat, Dec 20, 2014 at 11:52:57PM +0100, Alphazo wrote: > Hello, > > I'm pretty new to XFS. I'm considering moving away from ext4 to XFS because > of the new self-describing option, performance and reliability improvements > that XFS went through over the past year. Now I'm puzzled with the new free > inode btree option (finobt). I tried to find some documentation about it > but couldn't find the pros or cons. So from an end-user perspective with a > couple of TB worth of photos: > - Does it improve overall reliability? No effect on reliability, good or bad. > - Does it provide faster fsck/repair? No, if anything, it slows it down because there's more metadata to verify and rebuild. > - Does it improve any read or write operation? No. > - Is it safe to use and does it recover as well as with finobt=0? Yes and yes. > - What is the typical case for enabling it It improves performance on aged filesystems i.e. months or years down the track when you've added and removed millions of files to/from the filesystem. > and would you recommend using it > for any new fs creation? Consider the fact that "-m crc=1,finobt=1" will be made the mkfs default in 3-6 months time - that will probably co-incide with a xfsprogs 3.3 release.... Cheers, Dave. -- Dave Chinner david@fromorbit.com _______________________________________________ xfs mailing list xfs@oss.sgi.com http://oss.sgi.com/mailman/listinfo/xfs