How to interpret spotEvictionRate in Azure Resource graph for spotresources?

Question

I ran the below query in Azure Resource Graphs to get the Spot eviction rates of different VMs in different regions.

SpotResources 
| where type =~ 'microsoft.compute/skuspotevictionrate/location' 
| where sku.name in~ ('standard_d2s_v4', 'standard_d4s_v4') 
| where location in~ ('eastus', 'southcentralus') 
| project skuName = tostring(sku.name), location, spotEvictionRate = tostring(properties.evictionRate) 
| order by skuName asc, location asc

I got values like 5-10, 10-15 for spotEvictionRate column.

I want to know what is meant by spotEvictionRate and how it is calculated. Does it mean that there is a 10% chance that a particular VM will get terminated in next hour?

It would be much helpful if someone can share any related documents/articles to read up on this.

Answer 1

Hello Arunan Sugunakumar

Welcome to Microsoft Q&A Platform, thanks for posting your query here.

The spotEvictionRate in Azure Resource Graph for SpotResources is the percentage of time that a Spot VM is evicted in a given hour. It is calculated based on the historical eviction rate of the VM SKU in the specified region. For example, if the spotEvictionRate is 10%, it means that there is a 10% chance that a particular VM will get terminated in the next hour.

Hope that helps.

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