Issue seeing full capacity when mounting NAS in OSX El Capitan

[markiteight]

I have a NAS running SnakeoilOS 1.1.3 that has three drives configured thusly:


The problem is when I mount the NAS to my mac it only recognizes the 20GB Boot/OS partition, which obviously causes a complaint when I try to drop my Music folder into it. I'm mounting using

"cifs://<NAS_IP_Address>"

which brings up a dialog box asking for a username/password to log in as Registered User, or no user/pw to log in as guest. It auto-fills the username box with a name I'm not using, and no password works. Even the user/pw I specified when installing Snakeoil doesn't work. So I choose "Guest" and proceed.
It next brings up a window asking me to choose "Music" or "Playlists". I choose "Music". It then opens a window showing this:



(Ignore the file "Unknown". That's a Beth Orton album I was using as a test.) No matter what directory I choose it only recognizes 17GB available out of 20. Even though it sees sda5, sdb1, and sdc1, it doesn't see the ~1.5TB of available drive space.

I received this suggestion from you via another user on another forum:

"That is a known issue with how samba calculates disk space. e.g. if the mount is like so:

sda1:/media/music
sdb1:/media/music/disk_1
sdc1:/media/music/disk_2

When you look at the free space of /media/music (and any folders under it, e.g. disk_1 or disk_2). It will be the freespace of sda1 (and not sda1+sdb1+sdc1).
The only workaround is to mount sdb1 as /media/music, copy the files over, then mount sdbc1 as /media/music, and copy the files over. Then when everything is done, re-mount it."

First of all, is there a way to change the mounts/partitions without reinstalling Snakeoil? The Ubiquity software contained in the install is the only way I can see to do it. So I reinstalled Snakeoil with the following configuration:


and tried again. It still only sees the space available under "/" while ignoring the rest. I tried mounting 

"cifs://<NAS_IP_Address>/media/music "

it asks for a password for the same non-existent username as before, I select guest, it thinks for a moment, and then I get an error message, "The share does not exist on the server. Please check the share name, and then try again."



Any ideas?