Since we want all backup sets go to a dedicated disk group, so we need to create a new disk group FRA by ourselves. First of all, we call asmca to finish our task.
[grid@primary01 ~]$ asmca
Please note that, you have to call asmca by grid, not root.
ASM configuration assistant opened.
Expand Disk Groups. Then click on Create.
Select disk candidates for disk group FRA.
The disk group FRA is creating.
The disk group FRA is created.