| 6.033 - Computer System Engineering | Handout 33 - Issued May 2, 2002 |
Read the rest of "Disconnected operation in the Coda file system" by Kistler and Satya, reading #22.
There is no one-pager for today. Work on your Design Project 2. However, think about these questions while reading the Coda paper:
Applications running on top of the Coda filesystem may be unaware that they can become disconnected from their file server(s). Why does this violate the end-to-end argument? Also, what is the main benefit that results from the design of Coda violating the end-to-end argument?
This will be a lecture by Prof. Morris on system design. The reading is the new Section D of Chapter 7, which was passed out in the May 1 lecture. (We'll add a hyperlink here as soon as it's available).
Design Project 2 is due today. The late policy is simple: there are absolutely no extensions.
There is no reading or hands-on assignment for today.
This lecture will be given by Prof. Michael Ernst.
For lecture read chapters 1, 2, and 4 of Brooks' "The Mythical Man-Month." This book is a classic that all systems people should have on their bookshelf. Although slightly old, it contains a unique perspective and advice on building complex systems. You will probably re-read this book several times during the next couple of decades. We all do.
For lecture read chapters 5, 8, and 11 of Brooks' "The Mythical Man-Month."
For this recitation, read Butler Lampson's "Hints for Computer System Design" (reading #23). If you have misplaced your copy, an online version is available. Try to think about good examples (from 6.033 or elsewhere) for some of the slogans in Lampson's paper. Try to establish connections between this paper and what we have discussed so far in 6.033. Think about the failed systems that we studied in the class and identify the main reason they failed. Did they violate any of Lampson's hints?
There may be one or two project presentations left over from Tuesday. These teams will present today.In this recitation, we will also be gathering feedback. Bring your criticisms, complaints, comments, and accolades about 6.033.
Finally, after wrapping up the discussion, we will hand out our record of quiz, design project, and one-pager grades. If you discover a mistake in our records, please bring the original paper showing your grade to your teaching assistant as soon as possible, but no later than the end of the quiz on Thursday, May 23.
Quiz 3 will be held in Johnson from 1:30pm to 2:30pm on Thursday,
May 23, 2002. It will focus on material from L18 up to and including
the May 16th recitation (R26). Of course, some of the questions may
still require thinking about earlier topics, so you may also want to
spend some time reviewing older material as well.
The quiz will be open book. That means you
can bring along any printed or written materials that you think
might be useful. Calculators are allowed, though not necessary. The
quiz will be mostly multiple choice, similar to quizzes 1 and 2.
The quiz is being held during finals period. The date was announced
earlier in the term, so you should not have problems with scheduling
conflicts. If, nevertheless, you have managed to create a conflict,
contact Prof. Kaashoek at kaashoek@mit.edu as soon as
possible to resolve the problem.
Il semble que la perfection soit atteinte non quand il n'y a plus rien
à ajouter, mais quand il n'y a plus rien à retrancher.
Meta-aphorisms of the week:
An aphorism is not an aphorism unless you know what it means.
I hate quotations.Quiz 3, Thursday, May 23 (covers L18 through R26)
Check WebSIS for grades in late May/early June.
System aphorism of the week:
(It seems that perfection is attained not when there is nothing
more to add, but when there is nothing more to take away.)
--
Antoine de Saint-Exupery, Terre des Hommes (Wind, Sand and
Stars, 1939, Chapter 3 "The Tool")
-- Winston Churchill
-- Ralph Waldo Emerson
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