From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-ot0-f172.google.com ([74.125.82.172]:37038 "EHLO mail-ot0-f172.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S934153AbeFVDT4 (ORCPT ); Thu, 21 Jun 2018 23:19:56 -0400 Received: by mail-ot0-f172.google.com with SMTP id 101-v6so5974796oth.4 for ; Thu, 21 Jun 2018 20:19:56 -0700 (PDT) MIME-Version: 1.0 In-Reply-To: <20180621221911.GT19934@dastard> References: <2a9a023d-fa37-59dc-caf2-c7c4167d3c75@levigo.de> <20180619161819.GD21698@magnolia> <20180621191535.GI7508@wotan.suse.de> <89d39e37-3944-f58d-018c-d36bdc9f870c@sandeen.net> <20180621221911.GT19934@dastard> From: Chris Murphy Date: Thu, 21 Jun 2018 21:19:54 -0600 Message-ID: Subject: Re: Mounting xfs filesystem takes long time Content-Type: text/plain; charset="UTF-8" Sender: linux-xfs-owner@vger.kernel.org List-ID: List-Id: xfs To: Dave Chinner Cc: Chris Murphy , Eric Sandeen , "Luis R. Rodriguez" , "Darrick J. Wong" , "swadmin - levigo.de" , xfs list On Thu, Jun 21, 2018 at 4:19 PM, Dave Chinner wrote: > The mkfs ratios are about as optimal as we can get for the > information we have about the storage - growing by > 10x (i.e. increaseing the number of AGs by 10x) puts us at the > outside edge of the acceptible filesystem performance and longevity > charcteristics. Growing by 100x puts us way outside the window, > and examples like this where we are taking about growing by 10000x > is just way beyond anything the static AG layout architecture was > ever intended to support.... OK that's useful information, thanks. What about from the other direction; is it possible to make an XFS file system too big, on an LVM thin volume? For example a 1TB drive, and I'm scratching my head at mkfs.xfs time and think maaaybe one day it could end up 25TB at the top end? So I figure do mkfs.xfs on a virtual LV of 5TB now and that gives me a 5x growfs if I really do hit 25TB one day. But for now, it's a 5TB XFS file system on a 1TB drive. Is there any negative performance effect if it turns out I never end up growing this file system (it lives forever on a 1TB drive as a 5TB virtual volume and file system)? -- Chris Murphy