ORA-09925: Unable to create audit trail file

I'm using Oracle 11.1.0.6.0 db, on Linux 64 bit server on Amazon cloud.

I'm getting following error when I run the connect command

SQL> connect / as sysdba
ERROR:
ORA-09925: Unable to create audit trail file
Linux-x86_64 Error: 30: Read-only file system
Additional information: 9925
ORA-09925: Unable to create audit trail file
Linux-x86_64 Error: 30: Read-only file system
Additional information: 9925

When I run this df -h command I'm not seeing the file system it's just showing as below

$ df -h
Filesystem Size Used Avail Use% Mounted on

I do not understand cause of this issue. Please let me know how to solve this issue

Try this:
connect to SQL*Plus, then do:

show parameter audit_file_dest

then exit SQL*Plus and do:

cd 
ls -ld .

What are the permissions? Ownership?

Perhaps a mounted filesystem has gone missing, and you don't have write permissions on the underlying mountpoint?

StackExchange Database Administrators Q#9923, answer score: 3