Conclusions

Overall: 99.9% and improving

Mission-critical attitude must permeate...

Imperfect software and hardware:

• focus on tolerance & graceful degradation
• careful thought about required semanticsà
  • some premium data is always available
  • but the rest is probabilistic
• make it easy to hot-swap
  • no preventative maintenance window
  • enables rolling upgrades of HW, OS, à

Much easier with help from the clients

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