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Designing Your Portal

Designing Your Portal

All my examples will be based on the premise that business wants a design that can yield 99.9 percent application availability for an enterprise level of support.Many people discuss availability and say different comments: "I want it available 24-7," "It can never go down," or, my favorite, "It can never go down between 8:00 A.M. and 6:30 P.M.". We are engineers, and we deal with numbers. I've included a handy table to put hard numbers on different levels of availability. As far as keeping it up between 8:00 A.M. and 6:30 P.M., you need High Availability (HA) in your design just the same.

Note

Table 1. Availability table

Percentage Available

 

98%

99%

99.90%

99.99%


  

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