From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from plane.gmane.org ([80.91.229.3]:51086 "EHLO plane.gmane.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1423054AbbEOAJx (ORCPT ); Thu, 14 May 2015 20:09:53 -0400 Received: from list by plane.gmane.org with local (Exim 4.69) (envelope-from ) id 1Yt3CJ-0005io-Ms for linux-btrfs@vger.kernel.org; Fri, 15 May 2015 02:09:51 +0200 Received: from c-50-164-174-197.hsd1.ma.comcast.net ([50.164.174.197]) by main.gmane.org with esmtp (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00 for ; Fri, 15 May 2015 02:09:51 +0200 Received: from cdysthe by c-50-164-174-197.hsd1.ma.comcast.net with local (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00 for ; Fri, 15 May 2015 02:09:51 +0200 To: linux-btrfs@vger.kernel.org From: Christian Subject: Mysterious device (id 0). Date: Thu, 14 May 2015 20:09:43 -0400 Message-ID: Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8; format=flowed Sender: linux-btrfs-owner@vger.kernel.org List-ID: Hi, My laptop has a small ext4 /boot partition /dev/sda1 and a large btrfs partition containing / and /home as a sub volume /dev/sda3 When I run scrub on /dev/sda3 and check status with sudo btrfs scrub status -d /dev/sda3 I get: scrub status for 3d52dc93-c89f-453f-965d-8601d11e7710 scrub device /dev/sda3 (id 1) history scrub started at Thu May 14 19:54:02 2015 and finished after 235 seconds total bytes scrubbed: 111.03GiB with 0 errors scrub device (id 0) history scrub started at Thu May 14 19:54:02 2015 and was aborted after 0 seconds total bytes scrubbed: 0.00B with 0 errors As device (id 0) is indicated, but I have no idea what it is. When I run scrub with a script (cron) the same device (id 0) shows up in a warning: /etc/cron.daily/btrfs-scrub: WARNING: device 0 not present scrub device /dev/sda3 (id 1) done scrub started at Sat May 2 08:03:46 2015 and finished after 241 seconds total bytes scrubbed: 109.06GiB with 0 errors scrub device (id 0) canceled scrub started at Sat May 2 08:03:46 2015 and was aborted after 0 seconds total bytes scrubbed: 0.00B with 0 errors What is this device (id 0) which never gets scrubbed but always shows up? I'm running Ubuntu 15.04 with the 3.19.0-16-generic kernel. P.S. I am not a developer. -- //Christian