Where does ACME stand today?

• Availability: failures are common

  • Traditional fault-tolerance doesn’t solve the problems

• Changability

  • In back-end system tiers, software upgrades difficult, failure-prone, or ignored
  • For application service over WWW, daily change

• Maintainability

  • system maintenance environments are unforgiving
  • human operator error is single largest failure source

• Evolutionary growth

  • 1U-PC cluster front-ends scale, evolve well
  • back-end scalability difficult, operator intensive

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