how to mount my new btrfs formated drive

[anika200]

I am new to the btrfs, I am trying it out on this box that has 2 hard drives.

I installed the OS onto the first drive with btrfs. The second drive was formated using gparted after the install to btrfs.

How do I use the new drive?
Do I have to mount it in fstab or some other thing?

blkid gives this for the drive or file system id:

UUID="3dddb32d-50ad-4ed1-bdc2-b1fd9ec6f47f" UUID_SUB="69621638-39e5-4566-8328-0fce69cd1212" TYPE="btrfs" PARTUUID="0000537f-01"

[anika200]

Whoops, Never mind. I think I figured it out from this other recent post about btrfs.
Well actually I am not sure.

[vinnywright]

hear is a good read and look at all of @oshunluvr's threads on it and related stuff

https://btrfs.wiki.kernel.org/index.php/Main_Page

https://www.kubuntuforums.net/showth...ot-How-To-quot

https://www.kubuntuforums.net/showth...ighlight=btrfs

VINNY

[vinnywright]

this one should show you what you need to know to get the right path to mount it in fstab

sudo btrfs filesystem show

the one you posted looks like your running install

VINNY

[anika200]

The first device partition is the / drive, the second one is the extra hdd I need to hold data and have formated to btrfs.
At the moment, I can not write anything to the /dev/sdb1 drive because I do not know why.
I am guessing that it is not mounted and ready for writing but I am not certain.

lee@lee-H67N-USB3-B3:~$ sudo btrfs filesystem show
[sudo] password for lee: 
Label: none  uuid: 168c70e2-2da1-4c80-a013-4dfb0396811f
        Total devices 1 FS bytes used 33.19GiB
        devid    1 size 77.03GiB used 37.02GiB path /dev/sda3


Label: none  uuid: 3dddb32d-50ad-4ed1-bdc2-b1fd9ec6f47f
        Total devices 1 FS bytes used 384.00KiB
        devid    1 size 224.90GiB used 2.04GiB path /dev/sdb1


Btrfs v3.14.1
lee@lee-H67N-USB3-B3:~$

[vinnywright]

At the moment, I can not write anything to the /dev/sdb1 drive because I do not know why.
I am guessing that it is not mounted and ready for writing but I am not certain.

that would probably be correct.

befor you add it to the /etc/fstab (so it mounts at boot) try it first .

do

sudo mkdir /mnt/btrfs

(you can substitute btrfs with watever you want to call your mount point)
then

sudo mount -t btrfs /dev/sdb1 /mnt/btrfs

(again substitute btrfs with whatever you used for the make directory command above )

can you use it now .

VINNY

[dibl]

At the moment, I can not write anything to the /dev/sdb1 drive because I do not know why.

After it is mounted, as per Vinny's guidance, the ownership permissions will be set to root. Using "sudo", make whatever data folders you need on the mounted partition, then set the ownership and permissions for users.

[vinnywright]

After it is mounted, as per Vinny's guidance, the ownership permissions will be set to root. Using "sudo", make whatever data folders you need on the mounted partition, then set the ownership and permissions for users.

Humm yes I did forget to mention this ,,,,,but

vinny@vinny-Bonobo-Extreme:~$ cd /mnt
vinny@vinny-Bonobo-Extreme:/mnt$ ls -l
total 4
drwxrwxrwx 1 [COLOR=#ff0000]root root[/COLOR]   84 Jan 30 17:12 btrfs
drwxr-xr-x 2 root root 4096 Oct 10 22:34 disk

vinny@vinny-Bonobo-Extreme:/mnt$ cd btrfs/
vinny@vinny-Bonobo-Extreme:/mnt/btrfs$ ls -l
total 4
drwxr-xr-x 1 root  root    0 Jan 29 19:57 @data
drwxr-xr-x 1 root  root   10 Jan 29 16:48 ext2_saved
drwxr-xr-x 1 vinny vinny 120 Oct 13 23:17 kubuntu
drwx------ 1 root  root    0 Oct  2 16:55 lost+found
drwxrwxr-x 1 vinny vinny   0 Jan 30 17:12 New Folder

I had no problem making "New Folder" in dolphin even though "/btrfs" is owned by root ?

mount options

vinny@vinny-Bonobo-Extreme:/mnt/btrfs$ cat /etc/fstab
# /etc/fstab: static file system information.
#
# Use 'blkid' to print the universally unique identifier for a
# device; this may be used with UUID= as a more robust way to name devices
# that works even if disks are added and removed. See fstab(5).
#
# <file system> <mount point>   <type>  <options>       <dump>  <pass>
# / was on /dev/sda3 during installation
UUID=f10fe189-1184-4546-bbb2-58a9f0edbf8d /               ext4    errors=remount-ro 0       1
# swap was on /dev/sda2 during installation
UUID=aeb8718b-d4a7-4d21-9584-425071e6c6ba none            swap    sw              0       0
[COLOR=#ff0000]#TB-drive
/dev/sdb1 /mnt/btrfs    btrfs     rw,relatime,space_cache,compress=lzo     0    0[/COLOR]

strange.

VINNY

[oshunluvr]

In Vinny's case - his is mounted to /mnt/btrfs which has +rwx for everyone - the whole world.

That's one solution, however depending on who has access to your PC or if you care, you may not want the whole world into your data.

A better choice IMO would be to create a subvolume on the btrfs partition, give it your user ownership and private permission.

For example:

mkdir ~/data
sudo mount /dev/sdb1 /mnt
sudo btrfs subvolume create /mnt/@data
sudo chmod o-rx /mnt/@data
sudo chown lee:lee /mnt/@data
sudo umount /mnt

Now you have a subvolume on /dev/sdb1 that belongs only to you. Let mount it to try it out:

sudo mount /dev/sdb1 -o rw,relatime,space_cache,compress=lzo,subvol=@data /home/lee/data

Your subvolume should now be ready for use.

To mount it automatically at boot time; edit /etc/fstab and add this line:

UUID=3dddb32d-50ad-4ed1-bdc2-b1fd9ec6f47f btrfs /home/lee/data rw,relatime,space_cache,compress=lzo,subvol=@data 0 0

or

/dev/sdb1 btrfs /home/lee/data rw,relatime,space_cache,compress=lzo,subvol=@data 0 0

[anika200]

A better choice IMO would be to create a subvolume on the btrfs partition, give it your user ownership and private permission.

This is what I was wanting to do as well, I may have time to work it up today or tomorrow.
Thanks to all for the great information, really appreciate it.
I am still working through the documents at the moment and will post the results of my endeavors.

[vinnywright]

In Vinny's case - his is mounted to /mnt/btrfs which has +rwx for everyone - the whole world.

ya I was tired when I posted that ,,,,,,,,,,,,,,,,, I meant to say it was strange that /mnt/btrfs was writable and /mnt/disk was not (for users/everyone) when they were made in the same way (with sudo mkdir)

VINNY

[oshunluvr]

ya I was tired when I posted that ,,,,,,,,,,,,,,,,, I meant to say it was strange that /mnt/btrfs was writable and /mnt/disk was not (for users/everyone) when they were made in the same way (with sudo mkdir)

VINNY

Yeah that is odd. The mount target will take the permissions of the mounted filesystem or can be mounted using umask= to change the permissions. I can't imagine how yours got mounted that way. Have you changed your default umask?

[vinnywright]

Yeah that is odd. The mount target will take the permissions of the mounted filesystem or can be mounted using umask= to change the permissions. I can't imagine how yours got mounted that way. Have you changed your default umask?

no not to my knowledge.

just did a test in /mnt

vinny@vinny-Bonobo-Extreme:/mnt$ ls -l
total 8
drwxrwxrwx 1 root root   84 Jan 31 02:49 btrfs
drwxr-xr-x 2 root root 4096 Oct 10 22:34 disk
[COLOR=#ff0000]drwxr-xr-x 2 root root 4096 Jan 31 15:06 test[/COLOR]

not writable everyone

and in /btrfs

vinny@vinny-Bonobo-Extreme:/mnt/btrfs$ ls -l
total 4
drwxr-xr-x 1 root  root    0 Jan 29 19:57 @data
drwxr-xr-x 1 root  root   10 Jan 29 16:48 ext2_saved
drwxr-xr-x 1 vinny vinny 120 Oct 13 23:17 kubuntu
drwx------ 1 root  root    0 Oct  2 16:55 lost+found
drwxrwxr-x 1 vinny vinny   0 Jan 30 17:12 New Folder
[COLOR=#ff0000]drwxr-xr-x 1 root  root    0 Jan 31 15:12 test2[/COLOR]

not writable everyone

vinny@vinny-Bonobo-Extreme:/mnt/btrfs$ umask
0002

cat /etc/fstab

#TB-drive
/dev/sdb1 /mnt/btrfs    btrfs     rw,relatime,space_cache,compress=lzo     0    0

VINNY

[oshunluvr]

So unmount it, then check the permissions of /mnt/btrfs, then remount it using:

sudo mount /dev/sdb1

and check again. Weird...

[vinnywright]

vinny@vinny-Bonobo-Extreme:~$ sudo umount /dev/sdb1
vinny@vinny-Bonobo-Extreme:~$ cd /mnt
vinny@vinny-Bonobo-Extreme:/mnt$ ls -l
total 12
[COLOR=#ff0000]drwxr-xr-x 2 root root 4096 Jan 29 17:22 btrfs[/COLOR]
drwxr-xr-x 2 root root 4096 Oct 10 22:34 disk
drwxr-xr-x 2 root root 4096 Jan 31 15:06 test

vinny@vinny-Bonobo-Extreme:/mnt$ sudo mount -a
vinny@vinny-Bonobo-Extreme:/mnt$ ls -l
total 8
[COLOR=#ff0000]drwxrwxrwx 1 root root   94 Jan 31 15:12 btrfs[/COLOR]
drwxr-xr-x 2 root root 4096 Oct 10 22:34 disk
drwxr-xr-x 2 root root 4096 Jan 31 15:06 test
vinny@vinny-Bonobo-Extreme:/mnt$

yes weird ,,,, the fstab line is correct though

vinny@vinny-Bonobo-Extreme:/mnt$ cat /etc/fstab
# /etc/fstab: static file system information.
#
# Use 'blkid' to print the universally unique identifier for a
# device; this may be used with UUID= as a more robust way to name devices
# that works even if disks are added and removed. See fstab(5).
#
# <file system> <mount point>   <type>  <options>       <dump>  <pass>
# / was on /dev/sda3 during installation
UUID=f10fe189-1184-4546-bbb2-58a9f0edbf8d /               ext4    errors=remount-ro 0       1
# swap was on /dev/sda2 during installation
UUID=aeb8718b-d4a7-4d21-9584-425071e6c6ba none            swap    sw              0       0
#TB-drive
[COLOR=#ff0000]/dev/sdb1 /mnt/btrfs    btrfs     rw,relatime,space_cache,compress=lzo     0    0[/COLOR]

VINNY