The research questions you try to answer.
Why did you select this topic?
What kind of technique will you use to answer your research questions?
How will you evaluate your solution and compare it to exciting work


Assumptions
	Caching access is at least an order of magnitude faster than disk access


Caching is an essential feature of distributed file systems because it filters out accesses to the slower layers of the storage hierarchy

Why not extend server cache
	It's not practical to increase the overall effiency simply by extending the server memory. First adding memory to server could be overly expensive. Second, as we have clients' local caches as our first level in the aforementioned hierarchy, the missing data is not likely to appear in the server cache. So to speak, the server cache largely overlaps with client cache.