In general, I don't see a need to use ASM with NFS, especially if you are using Netapp filers. But there are some specific circumstances where it might be a good thing ...
- You want to take advantage of the rebalancing functionality of ASM even though you are using NFS as your shared storage.
- You have multiple storage tiers (DAS/SAN and NAS) and would like them all to be managed by ASM.
- Some desktop virtualization tools (VirtualBox (fixed in 3.2.8) and VMware Fusion) do not allow shared disks, so the only way to install RAC on them is to use NFS for the shared storage. If you want to demonstrate ASM and RAC in these environments then you will need to consider combining NFS and ASM.
- You have multiple storage tiers (DAS/SAN and NAS) and would like them all to be managed by ASM.
- Some desktop virtualization tools (VirtualBox (fixed in 3.2.8) and VMware Fusion) do not allow shared disks, so the only way to install RAC on them is to use NFS for the shared storage. If you want to demonstrate ASM and RAC in these environments then you will need to consider combining NFS and ASM.
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