| M.I.T. DEPARTMENT OF EECS | |
|---|---|
| 6.033 - Computer System Engineering | Recitation 19 - Thursday, April 15, 2004 |
Read sections D and E, and appendices A and B of chapter 7.
Review Section D, which presents techniques that show up in almost every fault-tolerant system design. You probably already read through it once for design project 2. Section D shows that the MTTF of a single-engine plane is better than that of a 3-engine plane. What does that mean for a proposal to send three Mars rovers out to do three copies of the same experiment?
Appendix A reports on a number of fault-tolerant systems that failed to meet their goals, even though the designers had the best intentions. Appendix A is light-weight reading but highly informative. Identify principles from section E.1 that were violated in "Advantures with error correction."
Appendix B presents a sequence of nonvolatile storage designs with increasing reliability. Give one example of:
- a failure that fail-fast storage can tolerate but raw storage cannot.
- a failure that stable storage can tolerate but fail-fast storage cannot.
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