From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from relay.sgi.com (relay3.corp.sgi.com [198.149.34.15]) by oss.sgi.com (Postfix) with ESMTP id 11AC77F60 for ; Wed, 4 Feb 2015 19:02:59 -0600 (CST) Received: from cuda.sgi.com (cuda3.sgi.com [192.48.176.15]) by relay3.corp.sgi.com (Postfix) with ESMTP id 94596AC002 for ; Wed, 4 Feb 2015 17:02:55 -0800 (PST) Received: from ipmail07.adl2.internode.on.net (ipmail07.adl2.internode.on.net [150.101.137.131]) by cuda.sgi.com with ESMTP id 0dj92PDfBD7uU3De for ; Wed, 04 Feb 2015 17:02:53 -0800 (PST) Date: Thu, 5 Feb 2015 12:02:21 +1100 From: Dave Chinner Subject: Re: Using XFS on Raid Message-ID: <20150205010221.GQ4251@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: James Woolliscroft Cc: xfs@oss.sgi.com On Thu, Feb 05, 2015 at 12:23:53AM +0000, James Woolliscroft wrote: > Hi, > > > > I am new to XFS, I have spent a significant time searching for information > and have not found any documentation relating to the use of XFS over RAID > with N Drives where the Stripe Unit >256K. Use the defaults - they do the right thing. > It appears that XFS on RHEL7 and clones is limited to a maximum Stripe Unit > of 256KB. That's not correct. mkfs.xfs prior to v3.2.2 (i.e the latest) throw a warning about the default log stripe unit not being able to be set larger than 256k, but it then sets the lsu to a default of 32k and continues. The current version (which I think will hit RHEL7.1) omits the warning and just sets the lsu to 32k - defaults should just do the right thing and not bother users who are using defaults. Either version, however, will still result in the data stripe unit/width is still going to be 1m/2m in your case. > I also would like to find some information on how to correctly interpret the > statistics output when formatting a volume with XFS, particularly as the > process may use other settings which may require further investigation? They are a reflection of the command line parameters, or if not specified, the default CLI values. So, read the mkfs.xfs man page as it explains what everything means. Cheers, Dave. -- Dave Chinner david@fromorbit.com _______________________________________________ xfs mailing list xfs@oss.sgi.com http://oss.sgi.com/mailman/listinfo/xfs