While Planning and Designing next generation deployment architecture for Information Server Deployment we should consider for Storage area as it is the key. Has seen NFS planned for scratchdisk storage and it is not a good idea. For any new architecture performance is the key and from this perspective use of NFS as scratchdisk storage or for temporary storage (location specified in TMPDIR) is not recommend.
Dedicated High Speed SAN is recommended or use local disk storage. Shared SAN works well but it is possible can impact other applications when the Parallel Engine is used for disk intensive operations like sorting, as one example which can require significant temporary disk resources.
Will cover more aspects of Storage in Grid Deployment Discussion in coming weeks.