Attachment 9834 Details for Bug 22150 – CLI output of tests

CLI output of tests

file_22150.txt (text/plain), 9.49 KB, created by Ulrich Beckmann on 2017-12-12 22:00:24 CET

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Creator: Ulrich Beckmann

Created: 2017-12-12 22:00:24 CET

Size: 9.49 KB

patch

obsolete

>[root@mag6-clone ~]# rpm -qa | egrep 'kernel|btrfs|zstd'
>lib64zstd1-1.3.2-1.mga6
>btrfs-progs-4.14-2.mga6
>kernel-desktop-4.9.56-1.mga6-1-1.mga6
>kernel-firmware-nonfree-20171206-1.mga6.nonfree
>zstd-1.3.2-1.mga6
>kernel-userspace-headers-4.14.4-1.mga6
>kernel-desktop-4.14.4-1.mga6-1-1.mga6
>kernel-desktop-4.9.52-1.mga6-1-1.mga6
>kernel-desktop-latest-4.14.4-1.mga6
>kernel-firmware-20170531-1.mga6
>lib64btrfs0-4.14-2.mga6
>[root@mag6-clone ~]#
>[root@mag6-clone ~]# uname -a
>Linux mag6-clone 4.14.4-desktop-1.mga6 #1 SMP Tue Dec 5 23:19:21 UTC 2017 x86_64 x86_64 x86_64 GNU/Linux
>[root@mag6-clone ~]#
>[root@mag6-clone ~]# mount -l | grep btrfs
>/dev/mapper/vg1-mlvm15 on / type btrfs (rw,relatime,space_cache,subvolid=271,subvol=/@@@/.snapshots/def/first_default) [mag6-clone]
>/dev/mapper/vg1-mlvm15 on /.snapshots type btrfs (rw,relatime,space_cache,subvolid=259,subvol=/@@@/.snapshots) [mag6-clone]
>/dev/mapper/vg1-mlvm15 on /var/opt type btrfs (rw,relatime,space_cache,subvolid=266,subvol=/@@@/var/opt) [mag6-clone]
>/dev/mapper/vg1-mlvm15 on /var/tmp type btrfs (rw,relatime,space_cache,subvolid=268,subvol=/@@@/var/tmp) [mag6-clone]
>/dev/mapper/vg1-mlvm15 on /usr/local type btrfs (rw,relatime,space_cache,subvolid=264,subvol=/@@@/usr/local) [mag6-clone]
>/dev/mapper/vg1-mlvm15 on /opt type btrfs (rw,relatime,space_cache,subvolid=261,subvol=/@@@/opt) [mag6-clone]
>/dev/mapper/vg1-mlvm15 on /home type btrfs (rw,relatime,space_cache,subvolid=260,subvol=/@@@/home) [mag6-clone]
>/dev/mapper/vg1-mlvm15 on /srv type btrfs (rw,relatime,space_cache,subvolid=262,subvol=/@@@/srv) [mag6-clone]
>/dev/mapper/vg1-mlvm15 on /var/log type btrfs (rw,relatime,space_cache,subvolid=265,subvol=/@@@/var/log) [mag6-clone]
>/dev/mapper/vg1-mlvm15 on /var/spool type btrfs (rw,relatime,space_cache,subvolid=267,subvol=/@@@/var/spool) [mag6-clone]
>/dev/mapper/vg1-mlvm15 on /boot/grub2/x86_64-efi type btrfs (rw,relatime,space_cache,subvolid=263,subvol=/@@@/boot/grub2/x86_64-efi) [mag6-clone]
>/dev/mapper/vg1-mlvm15 on /var/cache type btrfs (rw,relatime,space_cache,subvolid=269,subvol=/@@@/var/cache) [mag6-clone]
>[root@mag6-clone ~]#
>[root@mag6-clone ~]# btrfs filesystem show /
>Label: 'mag6-clone'  uuid: a6f64afc-49de-4775-a92a-1170e1c0f708
>        Total devices 1 FS bytes used 9.10GiB
>        devid    1 size 25.00GiB used 12.32GiB path /dev/mapper/vg1-mlvm15
>
>[root@mag6-clone ~]# btrfs filesystem df /
>Data, single: total=10.01GiB, used=8.53GiB
>System, DUP: total=32.00MiB, used=16.00KiB
>Metadata, DUP: total=1.12GiB, used=581.42MiB
>GlobalReserve, single: total=37.56MiB, used=0.00B
>[root@mag6-clone ~]#
>[root@mag6-clone ~]# btrfs subvolume get-default /
>ID 271 gen 5030 top level 259 path @@@/.snapshots/def/first_default
>[root@mag6-clone ~]#
>[root@mag6-clone ~]# lvcreate -L 8G -n zlvm15 vg1
>  Logical volume "zlvm15" created.
>[root@mag6-clone ~]#
>[root@mag6-clone ~]# btrfs device add /dev/mapper/vg1-zlvm15 /
>/dev/mapper/vg1-zlvm15 appears to contain an existing filesystem (btrfs).
>ERROR: use the -f option to force overwrite of /dev/mapper/vg1-zlvm15
>[root@mag6-clone ~]#
>[root@mag6-clone ~]# blkid | grep zlvm15
>/dev/mapper/vg1-zlvm15: UUID="8eda2ced-8f19-4ac3-9b46-7f34e0dd3d42" UUID_SUB="6098306b-7a82-4c3b-b0b3-2547dbc300ca" TYPE="btrfs"
>[root@mag6-clone ~]#
>[root@mag6-clone ~]# btrfs device add -f /dev/mapper/vg1-zlvm15 /
>[root@mag6-clone ~]#
>[root@mag6-clone ~]# blkid | grep lvm15
>/dev/mapper/vg1-mlvm15: LABEL="mag6-clone" UUID="a6f64afc-49de-4775-a92a-1170e1c0f708" UUID_SUB="c7e12f25-8f83-4f7c-a875-d467023c16f5" TYPE="btrfs"
>/dev/mapper/vg1-zlvm15: LABEL="mag6-clone" UUID="a6f64afc-49de-4775-a92a-1170e1c0f708" UUID_SUB="5bdfba3f-6665-4aad-a8e1-98183162eed4" TYPE="btrfs"
>[root@mag6-clone ~]#
>[root@mag6-clone ~]#
>[root@mag6-clone ~]# btrfs balance --full-balance / &
>[1] 15034
>[root@mag6-clone ~]#
>[root@mag6-clone ~]# btrfs balance --full-balance / &
>[1] 15034
>[root@mag6-clone ~]# btrfs balance status /
>Balance on '/' is running
>9 out of about 14 chunks balanced (10 considered),  36% left
>[root@mag6-clone ~]#
>[root@mag6-clone ~]# Done, had to relocate 14 out of 14 chunks
>
>[1]+  Done                    btrfs balance --full-balance /
>[root@mag6-clone ~]#
>[root@mag6-clone ~]# btrfs filesystem show /
>Label: 'mag6-clone'  uuid: a6f64afc-49de-4775-a92a-1170e1c0f708
>        Total devices 2 FS bytes used 9.11GiB
>        devid    1 size 25.00GiB used 9.78GiB path /dev/mapper/vg1-mlvm15
>        devid    2 size 8.00GiB used 800.00MiB path /dev/mapper/vg1-zlvm15
>
>[root@mag6-clone ~]# btrfs filesystem df /
>Data, single: total=9.00GiB, used=8.54GiB
>System, RAID1: total=32.00MiB, used=16.00KiB
>Metadata, RAID1: total=768.00MiB, used=589.88MiB
>GlobalReserve, single: total=39.16MiB, used=0.00B
>[root@mag6-clone ~]#
>[root@mag6-clone ~]# snapper create -d 'test #22150' -u 'important=yes'
>[root@mag6-clone ~]#
>[root@mag6-clone ~]# snapper list | grep important
>single | 44 |       | Mon 20 Nov 2017 10:39:54 CET | root | number  | sony-rollbck-2                                          | important=yes
>single | 49 |       | Sat 25 Nov 2017 14:00:37 CET | root | number  | sony-rollbck-3                                          | important=yes
>single | 52 |       | Thu 30 Nov 2017 11:37:15 CET | root | number  | sony-rollbck-4                                          | important=yes
>single | 57 |       | Tue 05 Dec 2017 10:19:33 CET | root | number  | sony-rollbck-1                                          | important=yes
>single | 60 |       | Sun 10 Dec 2017 13:53:52 CET | root | number  | sony-rollbck-2                                          | important=yes
>single | 69 |       | Tue 12 Dec 2017 20:04:19 CET | root |         | test #22150                                             | important=yes
>[root@mag6-clone ~]#
>[root@mag6-clone ~]# snapper rollback 69
>Creating read-only snapshot of current system. (Snapshot 70.)
>Creating read-write snapshot of snapshot 69. (Snapshot 71.)
>Setting default subvolume to snapshot 71.
>[root@mag6-clone ~]#
>[root@mag6-clone ~]# btrfs subvolume get-default /
>ID 365 gen 5205 top level 259 path @@@/.snapshots/71/snapshot
>[root@mag6-clone ~]#
>
>... snip ...
>
>several steps in chroot not documented here ...
>
>after reboot ...
>
>... snip ...
>
>[root@mag6-clone ~]# mount -l | grep btrfs
>/dev/mapper/vg1-mlvm15 on / type btrfs (rw,relatime,space_cache,subvolid=365,subvol=/@@@/.snapshots/71/snapshot) [mag6-clone]
>/dev/mapper/vg1-mlvm15 on /.snapshots type btrfs (rw,relatime,space_cache,subvolid=259,subvol=/@@@/.snapshots) [mag6-clone]
>/dev/mapper/vg1-mlvm15 on /usr/local type btrfs (rw,relatime,space_cache,subvolid=264,subvol=/@@@/usr/local) [mag6-clone]
>/dev/mapper/vg1-mlvm15 on /srv type btrfs (rw,relatime,space_cache,subvolid=262,subvol=/@@@/srv) [mag6-clone]
>/dev/mapper/vg1-mlvm15 on /var/tmp type btrfs (rw,relatime,space_cache,subvolid=268,subvol=/@@@/var/tmp) [mag6-clone]
>/dev/mapper/vg1-mlvm15 on /var/spool type btrfs (rw,relatime,space_cache,subvolid=267,subvol=/@@@/var/spool) [mag6-clone]
>/dev/mapper/vg1-mlvm15 on /var/opt type btrfs (rw,relatime,space_cache,subvolid=266,subvol=/@@@/var/opt) [mag6-clone]
>/dev/mapper/vg1-mlvm15 on /opt type btrfs (rw,relatime,space_cache,subvolid=261,subvol=/@@@/opt) [mag6-clone]
>/dev/mapper/vg1-mlvm15 on /var/log type btrfs (rw,relatime,space_cache,subvolid=265,subvol=/@@@/var/log) [mag6-clone]
>/dev/mapper/vg1-mlvm15 on /home type btrfs (rw,relatime,space_cache,subvolid=260,subvol=/@@@/home) [mag6-clone]
>/dev/mapper/vg1-mlvm15 on /boot/grub2/x86_64-efi type btrfs (rw,relatime,space_cache,subvolid=263,subvol=/@@@/boot/grub2/x86_64-efi) [mag6-clone]
>/dev/mapper/vg1-mlvm15 on /var/cache type btrfs (rw,relatime,space_cache,subvolid=269,subvol=/@@@/var/cache) [mag6-clone]
>[root@mag6-clone ~]#
>[root@mag6-clone ~]# blkid | grep lvm15
>/dev/mapper/vg1-mlvm15: LABEL="mag6-clone" UUID="a6f64afc-49de-4775-a92a-1170e1c0f708" UUID_SUB="c7e12f25-8f83-4f7c-a875-d467023c16f5" TYPE="btrfs"
>/dev/mapper/vg1-zlvm15: LABEL="mag6-clone" UUID="a6f64afc-49de-4775-a92a-1170e1c0f708" UUID_SUB="5bdfba3f-6665-4aad-a8e1-98183162eed4" TYPE="btrfs"
>[root@mag6-clone ~]#
>[root@mag6-clone ~]# btrfs scrub start /
>scrub started on /, fsid a6f64afc-49de-4775-a92a-1170e1c0f708 (pid=14123)
>[root@mag6-clone ~]#
>[root@mag6-clone ~]# btrfs scrub status /
>scrub status for a6f64afc-49de-4775-a92a-1170e1c0f708
>        scrub started at Tue Dec 12 20:49:44 2017 and finished after 00:02:19
>        total bytes scrubbed: 9.73GiB with 0 errors
>[root@mag6-clone ~]#
>[root@mag6-clone ~]# btrfs device remove /dev/mapper/vg1-zlvm15 /
>ERROR: error removing device '/dev/mapper/vg1-zlvm15': unable to go below two devices on raid1
>[root@mag6-clone ~]#
>[root@mag6-clone ~]# btrfs balance start -sconvert=raid0 -mconvert=raid0 /
>ERROR: Refusing to explicitly operate on system chunks.
>Pass --force if you really want to do that.
>[root@mag6-clone ~]#
>[root@mag6-clone ~]# btrfs balance start --force -sconvert=raid0 -mconvert=raid0 /
>Done, had to relocate 5 out of 11 chunks
>[root@mag6-clone ~]#
>[root@mag6-clone ~]# btrfs device remove /dev/mapper/vg1-zlvm15 /
>[root@mag6-clone ~]#
>[root@mag6-clone ~]# btrfs filesystem df /
>Data, single: total=9.00GiB, used=8.58GiB
>System, single: total=64.00MiB, used=16.00KiB
>Metadata, single: total=1.00GiB, used=593.34MiB
>GlobalReserve, single: total=40.77MiB, used=0.00B
>[root@mag6-clone ~]#
>[root@mag6-clone ~]# btrfs filesystem show /
>Label: 'mag6-clone'  uuid: a6f64afc-49de-4775-a92a-1170e1c0f708
>        Total devices 1 FS bytes used 9.16GiB
>        devid    1 size 25.00GiB used 10.06GiB path /dev/mapper/vg1-mlvm15
>
>[root@mag6-clone ~]#

[root@mag6-clone ~]# rpm -qa | egrep 'kernel|btrfs|zstd'
lib64zstd1-1.3.2-1.mga6
btrfs-progs-4.14-2.mga6
kernel-desktop-4.9.56-1.mga6-1-1.mga6
kernel-firmware-nonfree-20171206-1.mga6.nonfree
zstd-1.3.2-1.mga6
kernel-userspace-headers-4.14.4-1.mga6
kernel-desktop-4.14.4-1.mga6-1-1.mga6
kernel-desktop-4.9.52-1.mga6-1-1.mga6
kernel-desktop-latest-4.14.4-1.mga6
kernel-firmware-20170531-1.mga6
lib64btrfs0-4.14-2.mga6
[root@mag6-clone ~]#
[root@mag6-clone ~]# uname -a
Linux mag6-clone 4.14.4-desktop-1.mga6 #1 SMP Tue Dec 5 23:19:21 UTC 2017 x86_64 x86_64 x86_64 GNU/Linux
[root@mag6-clone ~]#
[root@mag6-clone ~]# mount -l | grep btrfs
/dev/mapper/vg1-mlvm15 on / type btrfs (rw,relatime,space_cache,subvolid=271,subvol=/@@@/.snapshots/def/first_default) [mag6-clone]
/dev/mapper/vg1-mlvm15 on /.snapshots type btrfs (rw,relatime,space_cache,subvolid=259,subvol=/@@@/.snapshots) [mag6-clone]
/dev/mapper/vg1-mlvm15 on /var/opt type btrfs (rw,relatime,space_cache,subvolid=266,subvol=/@@@/var/opt) [mag6-clone]
/dev/mapper/vg1-mlvm15 on /var/tmp type btrfs (rw,relatime,space_cache,subvolid=268,subvol=/@@@/var/tmp) [mag6-clone]
/dev/mapper/vg1-mlvm15 on /usr/local type btrfs (rw,relatime,space_cache,subvolid=264,subvol=/@@@/usr/local) [mag6-clone]
/dev/mapper/vg1-mlvm15 on /opt type btrfs (rw,relatime,space_cache,subvolid=261,subvol=/@@@/opt) [mag6-clone]
/dev/mapper/vg1-mlvm15 on /home type btrfs (rw,relatime,space_cache,subvolid=260,subvol=/@@@/home) [mag6-clone]
/dev/mapper/vg1-mlvm15 on /srv type btrfs (rw,relatime,space_cache,subvolid=262,subvol=/@@@/srv) [mag6-clone]
/dev/mapper/vg1-mlvm15 on /var/log type btrfs (rw,relatime,space_cache,subvolid=265,subvol=/@@@/var/log) [mag6-clone]
/dev/mapper/vg1-mlvm15 on /var/spool type btrfs (rw,relatime,space_cache,subvolid=267,subvol=/@@@/var/spool) [mag6-clone]
/dev/mapper/vg1-mlvm15 on /boot/grub2/x86_64-efi type btrfs (rw,relatime,space_cache,subvolid=263,subvol=/@@@/boot/grub2/x86_64-efi) [mag6-clone]
/dev/mapper/vg1-mlvm15 on /var/cache type btrfs (rw,relatime,space_cache,subvolid=269,subvol=/@@@/var/cache) [mag6-clone]
[root@mag6-clone ~]#
[root@mag6-clone ~]# btrfs filesystem show /
Label: 'mag6-clone'  uuid: a6f64afc-49de-4775-a92a-1170e1c0f708
        Total devices 1 FS bytes used 9.10GiB
        devid    1 size 25.00GiB used 12.32GiB path /dev/mapper/vg1-mlvm15

[root@mag6-clone ~]# btrfs filesystem df /
Data, single: total=10.01GiB, used=8.53GiB
System, DUP: total=32.00MiB, used=16.00KiB
Metadata, DUP: total=1.12GiB, used=581.42MiB
GlobalReserve, single: total=37.56MiB, used=0.00B
[root@mag6-clone ~]#
[root@mag6-clone ~]# btrfs subvolume get-default /
ID 271 gen 5030 top level 259 path @@@/.snapshots/def/first_default
[root@mag6-clone ~]#
[root@mag6-clone ~]# lvcreate -L 8G -n zlvm15 vg1
  Logical volume "zlvm15" created.
[root@mag6-clone ~]#
[root@mag6-clone ~]# btrfs device add /dev/mapper/vg1-zlvm15 /
/dev/mapper/vg1-zlvm15 appears to contain an existing filesystem (btrfs).
ERROR: use the -f option to force overwrite of /dev/mapper/vg1-zlvm15
[root@mag6-clone ~]#
[root@mag6-clone ~]# blkid | grep zlvm15
/dev/mapper/vg1-zlvm15: UUID="8eda2ced-8f19-4ac3-9b46-7f34e0dd3d42" UUID_SUB="6098306b-7a82-4c3b-b0b3-2547dbc300ca" TYPE="btrfs"
[root@mag6-clone ~]#
[root@mag6-clone ~]# btrfs device add -f /dev/mapper/vg1-zlvm15 /
[root@mag6-clone ~]#
[root@mag6-clone ~]# blkid | grep lvm15
/dev/mapper/vg1-mlvm15: LABEL="mag6-clone" UUID="a6f64afc-49de-4775-a92a-1170e1c0f708" UUID_SUB="c7e12f25-8f83-4f7c-a875-d467023c16f5" TYPE="btrfs"
/dev/mapper/vg1-zlvm15: LABEL="mag6-clone" UUID="a6f64afc-49de-4775-a92a-1170e1c0f708" UUID_SUB="5bdfba3f-6665-4aad-a8e1-98183162eed4" TYPE="btrfs"
[root@mag6-clone ~]#
[root@mag6-clone ~]#
[root@mag6-clone ~]# btrfs balance --full-balance / &
[1] 15034
[root@mag6-clone ~]#
[root@mag6-clone ~]# btrfs balance --full-balance / &
[1] 15034
[root@mag6-clone ~]# btrfs balance status /
Balance on '/' is running
9 out of about 14 chunks balanced (10 considered),  36% left
[root@mag6-clone ~]#
[root@mag6-clone ~]# Done, had to relocate 14 out of 14 chunks

[1]+  Done                    btrfs balance --full-balance /
[root@mag6-clone ~]#
[root@mag6-clone ~]# btrfs filesystem show /
Label: 'mag6-clone'  uuid: a6f64afc-49de-4775-a92a-1170e1c0f708
        Total devices 2 FS bytes used 9.11GiB
        devid    1 size 25.00GiB used 9.78GiB path /dev/mapper/vg1-mlvm15
        devid    2 size 8.00GiB used 800.00MiB path /dev/mapper/vg1-zlvm15

[root@mag6-clone ~]# btrfs filesystem df /
Data, single: total=9.00GiB, used=8.54GiB
System, RAID1: total=32.00MiB, used=16.00KiB
Metadata, RAID1: total=768.00MiB, used=589.88MiB
GlobalReserve, single: total=39.16MiB, used=0.00B
[root@mag6-clone ~]#
[root@mag6-clone ~]# snapper create -d 'test #22150' -u 'important=yes'
[root@mag6-clone ~]#
[root@mag6-clone ~]# snapper list | grep important
single | 44 |       | Mon 20 Nov 2017 10:39:54 CET | root | number  | sony-rollbck-2                                          | important=yes
single | 49 |       | Sat 25 Nov 2017 14:00:37 CET | root | number  | sony-rollbck-3                                          | important=yes
single | 52 |       | Thu 30 Nov 2017 11:37:15 CET | root | number  | sony-rollbck-4                                          | important=yes
single | 57 |       | Tue 05 Dec 2017 10:19:33 CET | root | number  | sony-rollbck-1                                          | important=yes
single | 60 |       | Sun 10 Dec 2017 13:53:52 CET | root | number  | sony-rollbck-2                                          | important=yes
single | 69 |       | Tue 12 Dec 2017 20:04:19 CET | root |         | test #22150                                             | important=yes
[root@mag6-clone ~]#
[root@mag6-clone ~]# snapper rollback 69
Creating read-only snapshot of current system. (Snapshot 70.)
Creating read-write snapshot of snapshot 69. (Snapshot 71.)
Setting default subvolume to snapshot 71.
[root@mag6-clone ~]#
[root@mag6-clone ~]# btrfs subvolume get-default /
ID 365 gen 5205 top level 259 path @@@/.snapshots/71/snapshot
[root@mag6-clone ~]#

... snip ...

several steps in chroot not documented here ...

after reboot ...

... snip ...

[root@mag6-clone ~]# mount -l | grep btrfs
/dev/mapper/vg1-mlvm15 on / type btrfs (rw,relatime,space_cache,subvolid=365,subvol=/@@@/.snapshots/71/snapshot) [mag6-clone]
/dev/mapper/vg1-mlvm15 on /.snapshots type btrfs (rw,relatime,space_cache,subvolid=259,subvol=/@@@/.snapshots) [mag6-clone]
/dev/mapper/vg1-mlvm15 on /usr/local type btrfs (rw,relatime,space_cache,subvolid=264,subvol=/@@@/usr/local) [mag6-clone]
/dev/mapper/vg1-mlvm15 on /srv type btrfs (rw,relatime,space_cache,subvolid=262,subvol=/@@@/srv) [mag6-clone]
/dev/mapper/vg1-mlvm15 on /var/tmp type btrfs (rw,relatime,space_cache,subvolid=268,subvol=/@@@/var/tmp) [mag6-clone]
/dev/mapper/vg1-mlvm15 on /var/spool type btrfs (rw,relatime,space_cache,subvolid=267,subvol=/@@@/var/spool) [mag6-clone]
/dev/mapper/vg1-mlvm15 on /var/opt type btrfs (rw,relatime,space_cache,subvolid=266,subvol=/@@@/var/opt) [mag6-clone]
/dev/mapper/vg1-mlvm15 on /opt type btrfs (rw,relatime,space_cache,subvolid=261,subvol=/@@@/opt) [mag6-clone]
/dev/mapper/vg1-mlvm15 on /var/log type btrfs (rw,relatime,space_cache,subvolid=265,subvol=/@@@/var/log) [mag6-clone]
/dev/mapper/vg1-mlvm15 on /home type btrfs (rw,relatime,space_cache,subvolid=260,subvol=/@@@/home) [mag6-clone]
/dev/mapper/vg1-mlvm15 on /boot/grub2/x86_64-efi type btrfs (rw,relatime,space_cache,subvolid=263,subvol=/@@@/boot/grub2/x86_64-efi) [mag6-clone]
/dev/mapper/vg1-mlvm15 on /var/cache type btrfs (rw,relatime,space_cache,subvolid=269,subvol=/@@@/var/cache) [mag6-clone]
[root@mag6-clone ~]#
[root@mag6-clone ~]# blkid | grep lvm15
/dev/mapper/vg1-mlvm15: LABEL="mag6-clone" UUID="a6f64afc-49de-4775-a92a-1170e1c0f708" UUID_SUB="c7e12f25-8f83-4f7c-a875-d467023c16f5" TYPE="btrfs"
/dev/mapper/vg1-zlvm15: LABEL="mag6-clone" UUID="a6f64afc-49de-4775-a92a-1170e1c0f708" UUID_SUB="5bdfba3f-6665-4aad-a8e1-98183162eed4" TYPE="btrfs"
[root@mag6-clone ~]#
[root@mag6-clone ~]# btrfs scrub start /
scrub started on /, fsid a6f64afc-49de-4775-a92a-1170e1c0f708 (pid=14123)
[root@mag6-clone ~]#
[root@mag6-clone ~]# btrfs scrub status /
scrub status for a6f64afc-49de-4775-a92a-1170e1c0f708
        scrub started at Tue Dec 12 20:49:44 2017 and finished after 00:02:19
        total bytes scrubbed: 9.73GiB with 0 errors
[root@mag6-clone ~]#
[root@mag6-clone ~]# btrfs device remove /dev/mapper/vg1-zlvm15 /
ERROR: error removing device '/dev/mapper/vg1-zlvm15': unable to go below two devices on raid1
[root@mag6-clone ~]#
[root@mag6-clone ~]# btrfs balance start -sconvert=raid0 -mconvert=raid0 /
ERROR: Refusing to explicitly operate on system chunks.
Pass --force if you really want to do that.
[root@mag6-clone ~]#
[root@mag6-clone ~]# btrfs balance start --force -sconvert=raid0 -mconvert=raid0 /
Done, had to relocate 5 out of 11 chunks
[root@mag6-clone ~]#
[root@mag6-clone ~]# btrfs device remove /dev/mapper/vg1-zlvm15 /
[root@mag6-clone ~]#
[root@mag6-clone ~]# btrfs filesystem df /
Data, single: total=9.00GiB, used=8.58GiB
System, single: total=64.00MiB, used=16.00KiB
Metadata, single: total=1.00GiB, used=593.34MiB
GlobalReserve, single: total=40.77MiB, used=0.00B
[root@mag6-clone ~]#
[root@mag6-clone ~]# btrfs filesystem show /
Label: 'mag6-clone'  uuid: a6f64afc-49de-4775-a92a-1170e1c0f708
        Total devices 1 FS bytes used 9.16GiB
        devid    1 size 25.00GiB used 10.06GiB path /dev/mapper/vg1-mlvm15

[root@mag6-clone ~]#

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Attachments on bug 22150: 9834 | 9836