1. When file systems replicate files, they do not normally replicate all files. Give an example of a kind of file that is not worth replicating.

2. A file is replicated on 10 servers. List all the combinations of read quorum and write quorum that are permitted by the voting algorithm.

3. With a main memory file server that stores files contiguously, when a file grows beyond its current allocation unit, it will have to be copied. Suppose that the average file is 20K bytes and it takes 200  to copy a 32-bit word. How many files can be copied per second? Can you suggest a way to do this copying without tying up the file server's CPU the entire time?