Voting Disk files help to provide disk fencing, to prevent writes by failed database instances. They must be located on shared partitions that have identical paths on all nodes of the cluster. Oracle recommends that they have at least 280 MB of available space in each partition, and that you provide redundancy for the voting disks.
Choose one of the following voting disk redundancy options:
Select Normal Redundancy or High Redundancy if you want to have Oracle Clusterware create the voting disk, and create and manage additional voting disk files for you. Normal Redundancy is the default option. Provide storage paths for the voting disks.
Select External Redundancy if you use an external hardware or software mirroring product, and you want to use it to provide additional voting disk files for you. You should only select this option if you have another product that provides mirroring. If you select External Redundancy, then only specify the location for one voting disk file.
When you have made your selection, click Next.