filsystem_ioORA-56708

In DBCONSOLE I received the following message on a hpux 11.31 machine while trying to run the io calibrate feature of 11g.
DBCONSOLE> Information

The following Initialization parameters need to be set to the specified
value in order to run the I/O calibration tool successfully:
filesystemio_options - ASYNCH or SETALL
This error is a bit misleading...because filesystemio_options is already set, the cause is that the async io is disabled at the operating level......

cat calibrate_io.sql
SET SERVEROUTPUT ON
DECLARE
lat INTEGER;
iops INTEGER;
mbps INTEGER;
BEGIN
DBMS_RESOURCE_MANAGER.CALIBRATE_IO (8, 10, iops, mbps, lat);
DBMS_OUTPUT.PUT_LINE ('max_iops = ' || iops);
DBMS_OUTPUT.PUT_LINE ('latency = ' || lat);
dbms_output.put_line('max_mbps = ' || mbps);
end;
/

SQL> @"calibrate_io.sql"
DECLARE
*
ERROR at line 1:
ORA-56708: Could not find any datafiles with asynchronous i/o capability
ORA-06512: at "SYS.DBMS_RMIN", line 456
ORA-06512: at "SYS.DBMS_RESOURCE_MANAGER", line 1285
ORA-06512: at line 7

SQL> show parameter asyn

NAME TYPE
------------------------------------ ---------------------------------
VALUE
------------------------------
disk_asynch_io boolean
TRUE
tape_asynch_io boolean
TRUE
SQL> show parameter filesys

NAME TYPE
------------------------------------ ---------------------------------
VALUE
------------------------------
filesystemio_options string
SETALL
SQL> select name,asynch_io from v$datafile f,v$iostat_file i
where f.file#=i.file_no
and (filetype_name='Data File' or filetype_name='Temp File');

NAME ASYNCH_IO
------------------------------ ---------------------------

/oracle/dikpater/db/apps_st/da ASYNC_OFF
ta11g/DIKPATEROCP/datafile/o1_
mf_undotbs1_6677o0hr_.dbf