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articles/reliability/includes/reliability-over-provisioning-calculation-include.md

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---
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title: include file
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description: include file
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author: anaharris-ms
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ms.service: azure
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ms.topic: include
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ms.date: 1/7/2025
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ms.author: anaharris
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ms.custom: include file
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---
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To prepare for availability zone failure, consider *over-provisioning* the capacity of your service. Over-provisioning allows the solution to tolerate some degree of capacity loss and still continue to function without degraded performance.
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To prepare for availability zone failure, you should over-provision capacity of service. Over-provisioning allows the solution to tolerate capacity loss and still continue to function without degraded performance.
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To find out how many instances to over-provision, it's important to know that the platform spreads virtual machines across multiple zones and you need to account for at least the failure of one zone.
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To find out how many instances to over-provision, it's important to know that the platform spreads instances across multiple zones. You need to account for at least the failure of one zone.
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Follow these steps to find out the total number of instances you should provision:
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1. Determine the number of instances your peak workload requires. In this example, we use two scenarios. One is with 3 instances and one is with 4.
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2. Retrieve the over-provision instance count by multiplying the peak workload instance count by a factor of [(zones/(zones-1)]:
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>[!NOTE]
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>The following table assumes that the platform has three availability zones. If you have a different number of availability zones, adjust the formula accordingly.
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>The following table assumes that you're using three availability zones. If you use a different number of availability zones, adjust the formula accordingly.
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| Peak workload instance count | Factor of [(zones/(zones-1)]|Formula| Instances to provision (Rounded) |
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|-------|---------|---------|--------|

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