From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from smtpcmd02102.aruba.it ([62.149.158.102]:10100 "EHLO smtpcmd02102.aruba.it" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753348AbcBBOXt (ORCPT ); Tue, 2 Feb 2016 09:23:49 -0500 To: linux-btrfs@vger.kernel.org From: Marco Lorenzo Crociani Subject: Wrong df Avail space on three disk RAID1 when empty Message-ID: <56B0BA48.6070603@prismatelecomtesting.com> Date: Tue, 2 Feb 2016 15:16:40 +0100 MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8; format=flowed Sender: linux-btrfs-owner@vger.kernel.org List-ID: Hi, df on btrfs RAID1 fs on 3 disks (they are RAID0 hardware, two disk, arrays but its not important right?) show wrong avail space when empty # uname -a Linux kvm4.prisma 4.4.0-2.el7.elrepo.x86_64 #1 SMP Tue Jan 26 13:06:01 EST 2016 x86_64 x86_64 x86_64 GNU/Linux # btrfs --version btrfs-progs v4.4 # btrfs fi show Label: 'data' uuid: 4421464d-479c-44c4-9f01-8df0f7d05bd2 Total devices 3 FS bytes used 640.00KiB devid 1 size 7.28TiB used 2.00GiB path /dev/sdb devid 2 size 7.28TiB used 2.01GiB path /dev/sdc devid 3 size 7.28TiB used 2.01GiB path /dev/sdd # btrfs fi df /data Data, RAID1: total=1.00GiB, used=512.00KiB System, RAID1: total=8.00MiB, used=16.00KiB Metadata, RAID1: total=2.00GiB, used=112.00KiB GlobalReserve, single: total=16.00MiB, used=0.00B I expect to get from df -h some like Filesystem Size Used Avail Use% Mounted on /dev/sdb 11T 17M 11T 1% /data but I get: Filesystem Size Used Avail Use% Mounted on /dev/sdb 11T 17M 7,3T 1% /data If I fill the fs # ls -laht totale 11T -rw-r--r--. 1 root root 921G 1 feb 16.17 prova10 drwxr-xr-x. 1 root root 134 1 feb 15.23 . -rw-r--r--. 1 root root 1,0T 1 feb 14.00 prova9 -rw-r--r--. 1 root root 1,0T 1 feb 13.07 prova8 -rw-r--r--. 1 root root 1,0T 1 feb 12.20 prova7 -rw-r--r--. 1 root root 1,0T 28 gen 21.50 prova6 -rw-r--r--. 1 root root 1,0T 28 gen 21.08 prova5 -rw-r--r--. 1 root root 1,0T 28 gen 20.28 prova4 -rw-r--r--. 1 root root 1,0T 28 gen 19.50 prova3 -rw-r--r--. 1 root root 1,0T 28 gen 19.13 prova2 -rw-r--r--. 1 root root 1,0T 28 gen 18.37 prova1 -rw-r--r--. 1 root root 1,0T 28 gen 18.02 prova0 dr-xr-xr-x. 18 root root 4,0K 28 gen 15.30 .. I get: Filesystem Size Used Avail Use% Mounted on /dev/sdb 11T 11T 256K 100% /data # btrfs fi df /data/ Data, RAID1: total=10.90TiB, used=10.90TiB System, RAID1: total=8.00MiB, used=1.50MiB Metadata, RAID1: total=13.00GiB, used=11.24GiB GlobalReserve, single: total=512.00MiB, used=0.00B -- Marco Crociani Prisma Telecom Testing S.r.l. via Petrocchi, 4 20127 MILANO ITALY Phone: +39 02 26113507 Fax: +39 02 26113597 e-mail: marcoc@prismatelecomtesting.com web: http://www.prismatelecomtesting.com