RAC on NFS / ASM on NFS

Why?
I need to create a RAC cluster at a client site where they only have a NFS file server device.
To ASM or not ASM?

Options
direct NFS
Option 2 : ASM on NFS
You can make use of ASM with NFS by creating shared files on NFS that will act as Raw devices to ASM. The basic steps are:

• Create and mount NFS share
• Create blank files using dd command
• Use ASMCA to create a new diskgroup, set discovery string to the path where above files live

Details are available in this Oracle Base article : Using NFS with ASM and this Oracle Documentation : Creating Files on a NAS Device for Use with Oracle ASM

References
12cR1 Creating Files on a NAS Device for Use with Oracle ASM