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 -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
