adding raw devices to asm diskgroup

Hello,

I created raw device in linux and able to add disk to asm diskgroup in 11gR2 .I had read that ASM desupported raw device from 11gR2.Pls heallp me understand how the raw disk could be added to ASM diskgroup

SQL> select header_status,mount_status,name,path from v$asm_disk;

HEADER_STATU MOUNT_S NAME                PATH

------------ ------- ------------------------------ ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

UNKNOWN      CLOSED                    /dev/random

FORMER         CLOSED                    ORCL:DISK4

CANDIDATE    CLOSED                    /dev/asmdisk1_udev_sdf1

CANDIDATE    CLOSED                    /dev/raw/raw1

MEMBER         CACHED  DISK1                ORCL:DISK1

MEMBER         CACHED  DISK2                ORCL:DISK2

MEMBER         CACHED  DISK3                ORCL:DISK3

7 rows selected.

SQL> create diskgroup DATA3 external redundancy disk '/dev/raw/raw1';