From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-ig0-f180.google.com ([209.85.213.180]:38312 "EHLO mail-ig0-f180.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753905AbcCBUen (ORCPT ); Wed, 2 Mar 2016 15:34:43 -0500 Received: by mail-ig0-f180.google.com with SMTP id y8so3146043igp.1 for ; Wed, 02 Mar 2016 12:34:43 -0800 (PST) Received: from orf-v6.ssec.wisc.edu (orf-v6.ssec.wisc.edu. [2607:f388:1090:0:6600:6aff:fe6a:3374]) by smtp.googlemail.com with ESMTPSA id 203sm15355843ioo.30.2016.03.02.12.34.41 for (version=TLSv1/SSLv3 cipher=OTHER); Wed, 02 Mar 2016 12:34:41 -0800 (PST) Message-ID: <1456950881.15729.2.camel@gmail.com> Subject: duplicate automounts with btrfs RAID1 From: Leigh Orf To: linux-btrfs@vger.kernel.org Date: Wed, 02 Mar 2016 14:34:41 -0600 Content-Type: text/plain; charset="UTF-8" Mime-Version: 1.0 Sender: linux-btrfs-owner@vger.kernel.org List-ID: Hello, Not entirely sure this is a btrfs issue, but here is my problem. I've had this issue with recent Fedora and CentOS distros. I created a btrfs RAID 1 pair with two identical USB external drives, following the instructions found online: mkfs.btrfs -m raid1 -d raid1 /dev/sdc1 /dev/sdd1 Then I mount it as /ext1: % df |grep sdc /dev/sdc1 9767539112 1280 9765383552 1% /ext1 The problem? Over time, /dev/sdc1 keeps getting mounted under a different mount point, these accrue a couple per day: % mount|grep sdc /dev/sdc1 on /ext1 type btrfs (rw,relatime,space_cache) /dev/sdc1 on /run/media/fred/xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxx38fd1 type btrfs (rw,nosuid,nodev,relatime,space_cache) /dev/sdc1 on /run/media/fred/xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxx38fd11 type btrfs (rw,nosuid,nodev,relatime,space_cache) /dev/sdc1 on /run/media/fred/xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxx38fd12 type btrfs (rw,nosuid,nodev,relatime,space_cache) /dev/sdc1 on /run/media/fred/xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxx38fd13 type btrfs (rw,nosuid,nodev,relatime,space_cache) /dev/sdc1 on /run/media/fred/xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxx38fd14 type btrfs (rw,nosuid,nodev,relatime,space_cache) /dev/sdc1 on /run/media/fred/xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxx38fd15 type btrfs (rw,nosuid,nodev,relatime,space_cache) /dev/sdc1 on /run/media/fred/xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxx38fd16 type btrfs (rw,nosuid,nodev,relatime,space_cache) /dev/sdc1 on /run/media/fred/xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxx38fd17 type btrfs (rw,nosuid,nodev,relatime,space_cache) /dev/sdc1 on /run/media/fred/xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxx38fd18 type btrfs (rw,nosuid,nodev,relatime,space_cache) /dev/sdc1 on /run/media/fred/xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxx38fd19 type btrfs (rw,nosuid,nodev,relatime,space_cache) It's as if the OS keeps "discovering a new disk" and mounting it under /run/media (where things like external drives, thumb drives etc. automount). Here is info about my setup (up to date CentOS 7.2): % cat /etc/system-release CentOS Linux release 7.2.1511 (Core) % uname -a Linux xxx.xxx.xxx.edu 3.10.0-123.20.1.el7.x86_64 #1 SMP Thu Jan 29 18:05:33 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux % btrfs --version btrfs-progs v3.19.1 % btrfs fi show Label: none uuid: d9706351-609b-4c6e-9f37-7058bb038fd1 Total devices 2 FS bytes used 640.00KiB devid 1 size 4.55TiB used 2.03GiB path /dev/sdc1 devid 2 size 4.55TiB used 2.01GiB path /dev/sdd1 btrfs-progs v3.19.1 % btrfs fi df /ext1 Data, RAID1: total=1.00GiB, used=512.00KiB Data, single: total=8.00MiB, used=0.00B System, RAID1: total=8.00MiB, used=16.00KiB System, single: total=4.00MiB, used=0.00B Metadata, RAID1: total=1.00GiB, used=112.00KiB Metadata, single: total=8.00MiB, used=0.00B Periodically I manually unmount these duplicates, but they come back. I'd like a solution that doesn't involve disabling automount all together. Thanks for any pointers, and apologies if this issue is unrelated to the btrfs project. Leigh -- Leigh Orf Associate Scientist Cooperative Institute for Meteorological Satellite Studies University of Wisconsin - Madison