File Permissions

I notice that any files created on my Drobo FS while I am connected as an authenticated user have the permissions:
drwx–S— 3 root root 4096 Sep 25 06:09 Test

And any files I create while connected anonymously have the permissions:
drwxrwsrwx 128 nobody nobody 12288 Sep 23 01:34 Test2

Has anyone tried tampering with these permissions? I want to use unison for some file synchronisation however the current permissions mean I can only run unison as root.

Suggestions would be greatly appreciated.