In AFS-1, each time the VFS tried to open a cached file it would have Venus contact the server to make sure that the file was still valid.What is the problem with this approach? How do AFS-2 and AFS-3 solve this problem?

What will be an ideal response?


This approach generated many network calls, even when files had not been modified.
In AFS-2 and AFS-3, the server is responsible for ensuring that each client has the most upto-
date copy of its files. Each server keeps track of the files the client caches.When a file is
modified, the server performs a callback to clients that have that file cached.When a client
receives a callback, it knows that its cached version is no longer valid and requests the newest
version from the server.

Computer Science & Information Technology

You might also like to view...

A __________ path name gives the path to a file, starting with the directory that the program is in.

a. relative b. descendant c. full d. complete

Computer Science & Information Technology

Compare and contrast IPv4 addresses with IPv6 addresses

What will be an ideal response?

Computer Science & Information Technology

Which of the following is NOT a task that must be performed if an employee is terminated?

A. former employee must return all media B. former employee's home computer must be audited C. former employee's office computer must be secured D. former employee should be escorted from the premises

Computer Science & Information Technology

Sending a packet to all network devices is called a ____ transmission.

A. unicast B. multicast C. broadcast D. singlecast

Computer Science & Information Technology