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Application Reliability Metrics formula

  • January 21, 2010 at 1:12 am

    #209263

    I have table which has outagedate column with dates like below

    outagedate

    2009-12-05 04:21:00:000

    2009-12-06 08:22:00:000

    2009-12-10 01:11:00:000

    2010-01-05 04:11:00:000

    .

    .

    Now i want to use below formula to find the reliability for my application

    Weekly App Reliability = e^(-168/<Mean Time Between outage in hours>)

    can some body help me out to derive this ?

  • January 21, 2010 at 8:36 am

    #1106741

    Dividing into parts to make easier to understand

    1)fist step to get the date difference

    outagedatecolumn outagedatediffcolumn in hours

    date1 date2-date1

    date2 date3-date2

    date3

    2)second step

    get the mean time between outage in hours

    3) use the formula

    Weekly Reliability = e^(-168/<Mean Time Between outages in hours>)

    Any Takers??

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