Identify storage requirements and 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:
• Oracle ASM Disk Space Requirements
  Determine the total amount of Oracle Automatic Storage Management (Oracle ASM) disk space that you require for the database files and recovery files.
• 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.
• Configuring Disks Manually for Oracle Automatic Storage Management
  To use Oracle Automatic Storage Management with direct attached storage (DAS) or storage area network (SAN), the disks must be stamped with a header.