1. CompSci 296.2 Self-Managing Systems Shivnath Babu

2. 2 Reminder Feb 21 (next Tuesday) –Progress talk <= 5 minutes –Follow up paper to the HP paper we discussed Feb 23: Speaker from Cisco Feb 28: Speaker from IBM Tivoli March: Student-lead discussions –I will give you a set of papers to choose from –Let me know if you found any interesting paper

3. 3 Control-Theoretic Analysis of Lotus Notes End-to-end application of control theory to a systems problem Control of Lotus Notes server Figure 1 –Target system –Service level metric –Control (tuning) parameter, reference value

4. 4 Lotus Notes Client-server RPCs Client properties Server properties Monitoring the server (sensor)

5. 5 Approach System identification –Block diagram (Figure 2) –Transfer function (Equations in Section 3.2) –Parameter estimation (Table 1) Empirical Vs. First principles Controller design –Gain –Nonlinear? Experiments

6. 6 Discussion Strong points? Weak points? How does it relate to HP work, Oceano? Algorithm for system identification Effect of delay What does it mean to be nonlinear? Tradeoff between accuracy and recency Offline Vs. online