If you were using 10g ASM, you had to use the dbms_file_transfer package to copy files from an asm disk group to a cooked file system and vica versa. 11g ASM makes this process simpler. In 11g, the asmcmd command now has a cp command that can copy ASM files to a cooked file system and files from a cooked file system back to ASM.

You can find the details and syntax for this cp comand  here.