From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from plane.gmane.org ([80.91.229.3]:46524 "EHLO plane.gmane.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S933793AbbEORRd (ORCPT ); Fri, 15 May 2015 13:17:33 -0400 Received: from list by plane.gmane.org with local (Exim 4.69) (envelope-from ) id 1YtJEo-0004sL-U0 for linux-btrfs@vger.kernel.org; Fri, 15 May 2015 19:17:31 +0200 Received: from c-73-47-108-123.hsd1.ma.comcast.net ([73.47.108.123]) by main.gmane.org with esmtp (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00 for ; Fri, 15 May 2015 19:17:30 +0200 Received: from cdysthe by c-73-47-108-123.hsd1.ma.comcast.net with local (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00 for ; Fri, 15 May 2015 19:17:30 +0200 To: linux-btrfs@vger.kernel.org From: Christian Subject: Re: Mysterious device (id 0). Date: Fri, 15 May 2015 13:17:24 -0400 Message-ID: References: <55561CE6.3080807@oracle.com> <55562408.9010308@oracle.com> Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8; format=flowed In-Reply-To: <55562408.9010308@oracle.com> Sender: linux-btrfs-owner@vger.kernel.org List-ID: On 05/15/2015 12:51 PM, Anand Jain wrote: > > > On 05/16/2015 12:37 AM, Christian wrote: >> On 05/15/2015 12:20 PM, Anand Jain wrote: >>> >>> >>> On 05/15/2015 08:09 AM, Christian wrote: >>>> 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 >>> >>> we are reading an uninitialized device struct and that uninitialized >>> devid happens to be 0. looks like num_devices count went haywire. >>> >>> in this config was there any device delete ? or a reduce in # of >>> devices? and has the system been rebooted after that ? >>> >>> Thanks, Anand >> >> Not sure I understand fully what you are asking, but I deleted a swap >> partition on the drive a while back and increased the size of the btrfs >> partition (with gparted). I have rebooted many times since then. That is >> all the changes I have done to this SSD recently. > > ok got it. now do you have any other disk in the system with the same > fsid ? what does the btrfs fi show -d or blkid show. > > Thanks btrfs fi show -d Label: none uuid: 3d52dc93-c89f-453f-965d-8601d11e7710 Total devices 1 FS bytes used 108.94GiB devid 1 size 222.84GiB used 111.03GiB path /dev/sda3 blkid /dev/sda1: UUID="82348a5a-6c11-47dc-a4aa-884431c7cc1a" TYPE="ext4" PARTUUID="8e3b64c9-0f7d-4720-be83-8de7a63ec246" /dev/sda3: UUID="3d52dc93-c89f-453f-965d-8601d11e7710" UUID_SUB="91c64b93-2eb7-4e98-b940-57a2ae3edd6e" TYPE="btrfs" PARTUUID="40fcadee-050e-4f5d-8538-6abdfc57c7b8" It probably doesn't matter but the drive is an INTEL SSD on a Lenovo Thinkpad X1 Carbon with Ubuntu 15.04 > > >> Thanks. >>> >>> >>>> 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