Computer Science 555 - Reading Report #3 -- Fall 2007

Due: Wednesday, October 31, 2007, 11:00 p.m.

1. Compare and contrast approaches to file consistency used by NFS, Sprite, AFS1, AFS2, CODA, and the Google File System. Your answers should include a BRIEF explanation of what happens during conflicting reads and or writes. What assumptions are made by each system about the kinds of conflicts that might arise?
2. Several file systems have discussed improving reading and write performance. Explain LFS, RAID, and the Google File Systems each attempt to improve write performance. What aspects of performance are optimized by each (latency or throughput)?

INSTRUCTION:

The report must be submitted by 11:00 p.m. on October 31, 2007. The report should be approximately 3 pages, or roughly 1200 to 1500 words. To submit your report you will use the DEN Blackboard assignent submission mechanism. You will use this method regardless of whether you are an on-campus student or a DEN student.

How to submit Reading Report #3:

• STEP 1. Please login to DEN, and select csci555.
• STEP 2. Please select "Assignment" in the menu.
• STEP 3. Please select "view/Complete Reading Report #3".
• STEP 4. Please select "File To Attach" to attach your report. (NOTE: PDF, MS WORD, ASCII TEXT ONLY! Other formats are NOT acceptable.) Be sure to include your name and student ID number on the file you submit.
• STEP 5. Please select "Submit" button. (If you select *SAVE* button instead of *submit*, then the TA cannot view your report for grading.)

It is the individual student's responsibility to follow the submission instruction. Submissions that do not follow this instructions, e.g., submitted late, or only "Saved" and not submitted. may be penalized or may not be graded at all. Note that the submission box for the assignment may dissapear from the class web site at 11PM on October 31st, i.e. the submission deadline.

GUIDELINE:

This is a lot to cover in so few words - so our advice is to write a first pass at your answer that is longer, and then edit out material that is redundant or not to the point. The use of tables can be very effective in conveying your ideas in a small area, but the tables must be integrated with your textual discussion, and not the only item in your submission.