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.
• Oracle Clusterware Storage Space Requirements
  Use this information to determine the minimum number of disks and the minimum disk space requirements based on the redundancy type, for installing Oracle Clusterware files, and installing the starter database, for various Oracle Cluster deployments.
• About the Grid Infrastructure Management Repository
  Every Oracle Standalone Cluster and Oracle Domain Services Cluster contains a Grid Infrastructure Management Repository (GIMR), or the Management Database (MGMTDB).
• 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.
• Selecting Disks to use with Oracle ASM Disk Groups
  If you are sure that a suitable disk group does not exist on the system, then install or identify appropriate disk devices to add to a new disk group.
• Specifying the Oracle ASM Disk Discovery String
  When an Oracle ASM instance is initialized, Oracle ASM discovers and examines the contents of all of the disks that are in the paths that you designated with values in the ASM_DISKSTRING initialization parameter.
• Creating Files on a NAS Device for Use with Oracle Automatic Storage Management
  If you have a certified NAS storage device, then you can create zero-padded files in an NFS mounted directory and use those files as disk devices in an Oracle ASM disk group.