ACME: Claims of 5 9s?

• 99.999% availability from telephone company?

  • AT&T switches < 2 hours of failure in 40 years

• Cisco, HP, Microsoft, Sun … claim 99.999% availability claims (5 minutes down / year) in marketing/advertising

  • HP-9000 server HW and HP-UX OS can deliver 99.999% availability guarantee “in certain pre-defined, pre-tested customer environments”
  • Environmental? Application? Operator?

5 9s from Jim Gray’s talk: “Dependability

in the Internet Era”

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