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 1D7157CA3 for ; Thu, 11 Aug 2016 04:04:47 -0500 (CDT) Received: from cuda.sgi.com (cuda1.sgi.com [192.48.157.11]) by relay1.corp.sgi.com (Postfix) with ESMTP id D1AF88F8035 for ; Thu, 11 Aug 2016 02:04:43 -0700 (PDT) Received: from smtp1.cc.ic.ac.uk (smtp1.cc.ic.ac.uk [155.198.5.155]) by cuda.sgi.com with ESMTP id Ltnz0rGDiZKbsOUE (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NO) for ; Thu, 11 Aug 2016 02:04:40 -0700 (PDT) Date: Thu, 11 Aug 2016 10:04:09 +0100 From: Wei Lin Subject: Re: Question on migrating data between PVs in xfs Message-ID: <20160811090409.GA3448@ic> References: <20160809145046.GB5583@ic> <20160809223503.GJ19025@dastard> <20160810092313.GA16193@ic> <20160810105639.GR16044@dastard> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20160810105639.GR16044@dastard> 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: Dave Chinner Cc: xfs@oss.sgi.com, Wei Lin Hi Dave, Now I see your point. Initially I wanted to store the linear concat layout in a special file, read this file during allocation to compute on the fly if an extent falls into a physical volume. But now I do agree that from the perspective of OS engineering, filesystems should not know the underlying layout, at least not in such an "ad-hoc" way. Aligning AGs to physical volumes and applying allocation policy might be the best approach. Thank you very much for the help. Cheers, -- Wei Lin _______________________________________________ xfs mailing list xfs@oss.sgi.com http://oss.sgi.com/mailman/listinfo/xfs