Hi Dario,
the permissions look good one node ORACLERAC101, but what about node ORACLERAC102?
I am sorry, that i have not mentioned to check both nodes - i just implied it. On which node did you run the "CREATE DATABASE" statement? Have you also tried to dismount and remount the DATA disk group manually in each ASM instance for verification of the current state or have you already tried to create a non-sys folder / file with asmcmd?
ASM notices disk issues in particular situations - Oracle documentation: http://docs.oracle.com/cd/E11882_01/server.112/e16102/asmdiskgrps.htm#OSTMG10044
I currently got only an Oracle RAC 12.0.1.2 in my lab, so i can not try to re-create your issue.
Regards
Stefan