SAN versus NAS versus direct attached storage

Friends
I am trying to identify pros and cons of SAN verus NAS versus direct attached storage for OLTP as well as OLAP databases. Common sense tells me that direct attached storage should give me best performance, closely followed by SAN (My common sense may be nonsense, though). However, I am not able to find any published comparision, performance figures etc to conclude something on this subject with confidence.

Can you please guide me to some references? ( or may be share your experience)

Thanks and regards Received on Sun Dec 18 2005 - 09:27:04 CST