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Service availability percentage ?

cur
cur asked
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Last Modified: 2014-12-19
What are the standard value for service or system availability can define in the real way

I want to have my all the IT services  in terms of percentage ? example AD service 99% up time  like that . is there any industry standard on the value can define  . if I say 100% or 60% will not work in the reality  . please advice me on the way to define my availability based on any standard ?

please help me to justify the above
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madunixExecutive IT Director, (EE MVE)
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cur

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Thank you for your valuable information .what will happen this down time in continues way ? 1 % of the down time  in the continue way ?  is it normal or we need to define that too ?

coz whole year working without any issue and only the last 3 days of the year fail  create the bad customer satisfaction ?
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cur

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my question is if I say 40 hours of down time ? can it be in one go 40 hours of down time  will not worth for the business  ?  I hope we need to define in the weekly basis or monthly basis downtime ? isn't it  . otherwise first 11 months can run without any issue and the last month will have all the down time
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