From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mout.gmx.net ([74.208.4.201]:56006 "EHLO mout.gmx.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S934434Ab3HJPmZ (ORCPT ); Sat, 10 Aug 2013 11:42:25 -0400 Received: from mailout-us.gmx.com ([172.19.198.47]) by mrigmx.server.lan (mrigmxus002) with ESMTP (Nemesis) id 0Mfpmy-1VSzQ40aW4-00NDpA for ; Sat, 10 Aug 2013 17:42:24 +0200 Content-Type: text/plain; charset="utf-8" Date: Sat, 10 Aug 2013 11:42:21 -0400 From: "Mike Audia" Message-ID: <20130810154221.206170@gmx.com> MIME-Version: 1.0 Subject: Question about blocksize, I want to use 16k To: linux-btrfs@vger.kernel.org Sender: linux-btrfs-owner@vger.kernel.org List-ID: Wanting to use 16k block for my btrfs, I did so via: # mkfs.btrfs -l 16k -s 16k -L arch64 -f /dev/sda3 WARNING! - Btrfs v0.20-rc1-253-g7854c8b IS EXPERIMENTAL WARNING! - see http://btrfs.wiki.kernel.org before using Detected a SSD, turning off metadata duplication.  Mkfs with -m dup if you want to force metadata duplication. fs created label arch64 on /dev/sda3 nodesize 16384 leafsize 16384 sectorsize 16384 size 119.00GB Btrfs v0.20-rc1-253-g7854c8b But when I tried to mount it, dmesg showed these errors aobut sector sizes: # mount /dev/sda3 /newarch mount: wrong fs type, bad option, bad superblock on /dev/sda3,       missing codepage or helper program, or other error       In some cases useful info is found in syslog - try       dmesg | tail or so. [ 1463.366701] device label arch64 devid 1 transid 4 /dev/sda3 [ 1463.367186] btrfs: disk space caching is enabled [ 1463.367189] btrfs flagging fs with big metadata feature [ 1463.367539] btrfs: Incompatible sector size(16384) found on sda3 [ 1463.419215] btrfs: open_ctree failed So I made the filesystem like this and all is well... what am I missing? # mkfs.btrfs -l 16k -L arch64 -f /dev/sda3       WARNING! - Btrfs v0.20-rc1-253-g7854c8b IS EXPERIMENTAL WARNING! - see http://btrfs.wiki.kernel.org before using Detected a SSD, turning off metadata duplication.  Mkfs with -m dup if you want to force metadata duplication. fs created label arch64 on /dev/sda3 nodesize 16384 leafsize 16384 sectorsize 4096 size 119.00GB Btrfs v0.20-rc1-253-g7854c8b