Solution : https://service.sap.com/sap/support/notes/830264 (SAP Service marketplace login required)
Key words :
alter system set filesystemio_options = '<, platform-dependent default, filesystemio_options parameter displays, $parameter reason, filesystemio_options, prerequisites, note 694810, information, workaroundset
Related Notes :
| 694810 | Oracle 9.2.0.x and AIX Asynchronus IO parameter |