From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from userp1040.oracle.com ([156.151.31.81]:26915 "EHLO userp1040.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753443AbbEOQv3 (ORCPT ); Fri, 15 May 2015 12:51:29 -0400 Message-ID: <55562408.9010308@oracle.com> Date: Sat, 16 May 2015 00:51:20 +0800 From: Anand Jain MIME-Version: 1.0 To: Christian , linux-btrfs@vger.kernel.org Subject: Re: Mysterious device (id 0). References: <55561CE6.3080807@oracle.com> In-Reply-To: Content-Type: text/plain; charset=utf-8; format=flowed Sender: linux-btrfs-owner@vger.kernel.org List-ID: 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 > 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. >>> >> -- > > >