From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-ig0-f172.google.com ([209.85.213.172]:47368 "EHLO mail-ig0-f172.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755078AbaIWOrU (ORCPT ); Tue, 23 Sep 2014 10:47:20 -0400 Received: by mail-ig0-f172.google.com with SMTP id a13so4712565igq.5 for ; Tue, 23 Sep 2014 07:47:20 -0700 (PDT) Message-ID: <542187F3.7090603@gmail.com> Date: Tue, 23 Sep 2014 10:47:15 -0400 From: Austin S Hemmelgarn MIME-Version: 1.0 To: Tobias Holst CC: lists@xunil.at, linux-btrfs@vger.kernel.org Subject: Re: general thoughts and questions + general and RAID5/6 stability? References: <8D1A2626CC69D79-11FC-A2C3@webmail-va141.sysops.aol.com> <54208BBC.1000700@xunil.at> <542162A8.2010700@gmail.com> <5421706F.6070301@xunil.at> <542177BF.2000808@gmail.com> In-Reply-To: Content-Type: multipart/signed; protocol="application/pkcs7-signature"; micalg=sha1; boundary="------------ms050006000800000502050702" Sender: linux-btrfs-owner@vger.kernel.org List-ID: This is a cryptographically signed message in MIME format. --------------ms050006000800000502050702 Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: quoted-printable On 2014-09-23 10:23, Tobias Holst wrote: > If it is unknown, which of these options have been used at btrfs > creation time - is it possible to check the state of these options > afterwards on a mounted or unmounted filesystem? > > > 2014-09-23 15:38 GMT+02:00 Austin S Hemmelgarn >: > > Well, running 'mkfs.btrfs -O list-all' with 3.16 btrfs-progs gives > the following list of features: > mixed-bg - mixed data and metadata block groups > extref - increased hard-link limit per file to 655= 36 > raid56 - raid56 extended format > skinny-metadata - reduced size metadata extent refs > no-holes - no explicit hole extents for files > I don't think there is a specific tool for doing this, but some of them=20 do show up in dmesg, for example skinny-metadata shows up as a mention=20 of the FS having skinny extents. --------------ms050006000800000502050702 Content-Type: application/pkcs7-signature; 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