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 CF8E67F37 for ; Tue, 28 Apr 2015 15:54:14 -0500 (CDT) Received: from cuda.sgi.com (cuda3.sgi.com [192.48.176.15]) by relay1.corp.sgi.com (Postfix) with ESMTP id AB1038F808E for ; Tue, 28 Apr 2015 13:54:11 -0700 (PDT) Received: from ipmail05.adl6.internode.on.net (ipmail05.adl6.internode.on.net [150.101.137.143]) by cuda.sgi.com with ESMTP id aC8CKPUJtSpuPxD7 for ; Tue, 28 Apr 2015 13:54:09 -0700 (PDT) Date: Wed, 29 Apr 2015 06:53:45 +1000 From: Dave Chinner Subject: Re: question: are the metadata crc elements ready for general use? Message-ID: <20150428205345.GY21261@dastard> References: <553FDFE0.7050800@gmail.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <553FDFE0.7050800@gmail.com> 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: Joe Landman Cc: xfs@oss.sgi.com On Tue, Apr 28, 2015 at 03:30:40PM -0400, Joe Landman wrote: > I ask as I see this in the 3.2.2 mkfs.xfs command. The default is > to leave them off from what I can see on an mkfs.xfs. Yes, and we've been discussing whether they should be made the default in the upcoming 3.2.3 release or wait for 3.3. IIRC, the latest SLES release already defaults to using CRCs by default. > root@unison:~/xfsprogs# mkfs.xfs /dev/sda > meta-data=/dev/sda isize=256 agcount=55, > agsize=268435455 blks > = sectsz=512 attr=2, projid32bit=1 > = crc=0 finobt=0 > data = bsize=4096 blocks=14627632640, imaxpct=1 > = sunit=0 swidth=0 blks > naming =version 2 bsize=4096 ascii-ci=0 ftype=0 > log =internal log bsize=4096 blocks=521728, version=2 > = sectsz=512 sunit=0 blks, lazy-count=1 > realtime =none extsz=4096 blocks=0, rtextents=0 > > But they are there, and I am curious as to the developers/users > thoughts. Will they break things (nfs, CIFS/samba)? I enable them on all my systems, and almost all of my testing is done with "-m crc=1,finobt=1" options set. The don't affect applications at all - CRCs are completely transparent to userspace so applications don't even know the filesystem is using them. Cheers, Dave. -- Dave Chinner david@fromorbit.com _______________________________________________ xfs mailing list xfs@oss.sgi.com http://oss.sgi.com/mailman/listinfo/xfs