ORA-00200 when creating a new Database unless FILESYSTEMIO_OPTIONS=asynch

Hello,
For 11.2.0.2 database on IBM AIX platform

and
FILESYSTEMIO_OPTIONS=SETALL


when creating a new Database  the following error occurs

ORA-00200
ORA-00202
ORA-27041
IBM AIX RISC System/6000 Error: 22: Invalid argument
Additional information: 4
ORA-1501 signalled during: CREATE DATABASE "data" controlfile reuse


when FILESYSTEMIO_OPTIONS is changed to asynch the issue is solved

Are there known issues with the Parameter FILESYSTEMIO_OPTIONS and RAW-Devices?
Are those issues related to the Parameter by working with mixed data (RAW, filesystem)?

Thanks in advance,
Ola