UNIVERSITY OF HOUSTON
                      Department of Computer Science

                       COSC 6360--Operating Systems
                          QUALIFYING EXAMINATION
                              Graduate  Part
                            FINAL  EXAMINATION
                                  Part I
                                May 8, 1995

This exam is closed book.  You can have two sheet of notes.

1.      How would you modify the Sprite file system to let client
	caches directly cooperate with each other?  What would be the
	major advantages and disadvantages of your solution? (20
	points)

2.      There are now workstations having 64 bit addresses.  This is
	big enough to give every living human his or her own Gigabyte
	of data in the address space of every process!  Discuss the
	impact of very large address spaces on operating systems and
	indicate a few possible changes in the way things are done
	today.  (20 points)

                          UNIVERSITY OF HOUSTON
                      Department of Computer Science

                       COSC 6360--Operating Systems
                            FINAL  EXAMINATION
                                Part II
                              May 8, 1995

This exam is closed book.  You can have two sheet of notes.

1.	What mechanism does AMOEBA use to allow owners of a capability
        to construct a new capability with a subset of the rights of 
        that capability?  (10 points)

2.      According to L. Lamport, what is the major disadvantage of
        logical clocks?  (10 points)

3.      Which mechanisms are used by Grapevine to let a new client
        locate its first Grapevine server?  (10 points)

4.      Explain the mechanism used by Coda to detect inconsistencies
	between different replicas of the same file. (10 points)

5.      Contrast and compare Sprite prefix tables with NFS remote mount
	mechanism.  (10 points)

6.      What is the major advantage of a log-structured file system?
	(5 points)

7.      What is the only serious advantage of stateless file servers?
	(5 points)