Identify storage requirements and Oracle ASM disk group options.

• Identifying Storage Requirements for Oracle Automatic Storage Management
  To identify the storage requirements for using Oracle ASM, you must determine the number of devices and the amount of free disk space that you require. To complete this task, follow these steps:
• ASM Disk Group Options for Interactive and Noninteractive Installation
  You can select new disk groups during interactive installations, but you must use existing disk groups for noninteractive installations.
• Using an Existing Oracle ASM Disk Group
  Use Oracle Enterprise Manager Cloud Control or the Oracle ASM command line tool (asmcmd) to identify existing disk groups, and to determine if sufficient space is available in the disk group.