From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail.virtall.com ([178.63.195.102]:45065 "EHLO mail.virtall.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751146AbcITG4i (ORCPT ); Tue, 20 Sep 2016 02:56:38 -0400 Received: from localhost (localhost [127.0.0.1]) by mailext.virtall.com (Postfix) with ESMTP id F232627481A for ; Tue, 20 Sep 2016 08:47:15 +0200 (CEST) Received: from mailext.virtall.com ([127.0.0.1]) by localhost (web1.virtall.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id tRRWv9NV77mQ for ; Tue, 20 Sep 2016 08:47:14 +0200 (CEST) Received: from admin.virtall.com (localhost [127.0.0.1]) by mailext.virtall.com (Postfix) with ESMTP for ; Tue, 20 Sep 2016 08:47:14 +0200 (CEST) MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII; format=flowed Date: Tue, 20 Sep 2016 15:47:14 +0900 From: Tomasz Chmielewski To: linux-btrfs Subject: how to understand "btrfs fi show" output? "No space left" issues Message-ID: <566e9000fe30d5b8e0d7e73ebe1d44a0@admin.virtall.com> Sender: linux-btrfs-owner@vger.kernel.org List-ID: How to understand the following "btrfs fi show" output? # btrfs fi show /var/lib/lxd Label: 'btrfs' uuid: f5f30428-ec5b-4497-82de-6e20065e6f61 Total devices 2 FS bytes used 136.18GiB devid 1 size 423.13GiB used 423.13GiB path /dev/sda3 devid 2 size 423.13GiB used 423.13GiB path /dev/sdb3 Why is it "size 423.13GiB used 423.13GiB"? Is it full? I had "No space left" on this filesystem just yesterday (running kernel 4.7.4). This is btrfs RAID-1 on SSD disks. This filesystem is used for 20-30 LXD containers with different roles (mongo, mysql, postgres databases, webservers etc.), around 150 read-only snapshots, btrfs compression is disabled. Both "btrfs fi df" and "df -h" show plenty of space: # btrfs fi df /var/lib/lxd Data, RAID1: total=417.12GiB, used=131.33GiB System, RAID1: total=8.00MiB, used=80.00KiB Metadata, RAID1: total=6.00GiB, used=4.86GiB GlobalReserve, single: total=512.00MiB, used=0.00B # df -h Filesystem Size Used Avail Use% Mounted on /dev/sda3 424G 137G 286G 33% /var/lib/lxd Tomasz Chmielewski https://lxadm.com