All five problems count equally. Briefly define the following terms. In a block-based file system, we need some way to keep track of which blocks belong to which files.
Most file systems use a block cache or buffer cache to store recently used disk blocks in memory.
Describe this policy, and explain why it is not a practical policy to implement. Describe what each of these is, and explain what limitation of Unix-style file permissions they overcome. In NFS, the server is stateless while in the Andrew file system, the server is stateful. Define stateless and stateful . Discuss the relative advantages and disadvantages of stateless vs. stateful file servers.