alter system disconnect session for shared server session

Understanding this command can help to kill shared server session, 
e.g. alter system disconnect session '  11, 14521' immediate;


However, this didn't seem to work in my production situation. The session was not gone until we stopped application end. 
Any comments ?

ORA-01114

ORA-00603: ORACLE server session terminated by fatal error
ORA-24557: error 1114 encountered while handling error 1114; exiting server process
ORA-01114: IO error writing block to file 204 (block # 76928)

ERROR at line 1:

ORA-12801: error signaled in parallel query server P037

ORA-01114: IO error writing block to file (block # )

ORA-01114: IO error writing block to file 1527 (block # 3126400)

ORA-27072: File I/O error

Additional information: 4

Additional information: 3126400

Additional information: -1 

Hit above error, even run  a small query irregardless off 300GB TEMP space.

Please refer to my reply here