Reliability is often included in service level agreements (SLAs) when an organization is outsourcing. The toughest thing is to decide how much reliability is enough. Consider the objective of availability or uptime. What is the difference between 95%, 99%, 99.99%, and 99.9999% availability?

95% reliability = 18.25 days

99% reliability= 3.65 days

99.99% reliability= 0.0365 days

99.9999% reliability= 0.000365 days

Explanation:

1. Calculation for 95% reliability

Using this formula

95% Reliability=Worse percentage*Numbers of days

Let plug in the formula

95% Reliability=(100%-95%)*365

95% Reliability=5%*365

95% Reliability=18.25 days

2. Calculation for 99% reliability

Using this formula

99% Reliability=Worse percentage*Numbers of days

Let plug in the formula

99% Reliability=(100%-99%)*365

99% Reliability=1%*365

99% Reliability=3.65 days

3. Calculation for 99.99% reliability

Using this formula

99.99% Reliability=Worse percentage*Numbers of days

Let plug in the formula

99.99% Reliability=(100%-99.99%)*365

99.99% Reliability=0.01%*365

99.99% Reliability=0.0365 days

4. Calculation for 99.9999% reliability

Using this formula

99.9999% Reliability=Worse percentage*Numbers of days

Let plug in the formula

99.9999% Reliability=(100%-99.9999%)*365

99.9999% Reliability=0.0001%*365

99.9999% Reliability=0.000365 days

Therefore the difference between 95%, 99%, 99.99%, and 99.9999% are :

95% reliability = 18.25 days

99% reliability= 3.65 days

99.99% reliability=0.0365 days

99.9999% reliability= 0.000365 days

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