There would no doubt be some performance differences between local and networked but it is very normal in enterprises to deploy databases on a SAN to take advan

There would no doubt be some performance differences between local and networked but it is very normal in enterprises to deploy databases on a SAN to take advantage of the array's data services. On the NAS side I believe Oracle also are often deployed on NetApp arrays, they use their own NFS client to ensure the DB isn't compromised by bad NFS client implementations.