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How to calculate the composite SLA for Microsoft Azure edit button Edit

author
Murugan Andezuthu Dharmaratnam | calendar 04 July 2023 | 123

In this article I will give you an example of how a composite SLA for azure services can be calculated.

Azure SLA Board

SLA Chart calculate-the-availability-and-sla-for-your-azure-solution
composite sla calculation

SL No	Service Name	SLA
1	Azure SQL Database	99.995
2	App Service	99.95
3	Azure Active Directory	99.99
4	Azure Key Vault	99.99
5	API Management	99.99
6	Event Grid	99.99
7	Azure Front Door	99.99
8	Azure Storage	99.99
9	Azure Monitor	99.9
10	Azure Data Factory	99.9

Composite SLA for App Services = (0.9995) ^ 3 Composite SLA for other services = 0.99995 * 0.9999 * 0.9999 * 0.9999 * 0.9999 * 0.9999 Overall composite SLA = Composite SLA for App Services * Composite SLA for other services = .997952 Note : The SLAs for Azure Monitor and Azure Data Factory have not been included in the calculation.

Apologies for the confusion earlier. Let's calculate the downtime in both days and hours based on the SLA of 99.7952%.

To calculate the downtime in days, we can use the formula:

Downtime (in days) = (1 - SLA) * Total days in a year

Assuming a standard year of 365 days, you can calculate the downtime in days:

Downtime (in days) = (1 - 0.997952) * 365

Downtime (in days) ˜ 0.002048 * 365

Downtime (in days) ˜ 0.74752 days

To calculate the downtime in hours, we can use the formula:

Downtime (in hours) = Downtime (in days) * 24

Downtime (in hours) ˜ 0.74752 * 24

Downtime (in hours) ˜ 17.94 hours

Therefore, based on the given SLA of 99.7952%, the estimated downtime would be approximately 0.74752 days or 17.94 hours per year.