Hello, my name is Alejandro Bravo and I am a professional with more than 15 years of experience in Information Technology.
As Sysadmin, I have extensive practical knowledge of Windows Server, Active Directory, VMWare, SQL Server, MySQL, Azure, AWS, VPS, cPanel, Webmin, Wordpress, as well as certifications in Linux & Oracle.
It looks like your problem is related to disk space more than the mount itself, I can definitely help you to correct this problem.
Good luck!
Alex