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Single Instance VM in Azure

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Service Level Agreement ( SLA ) premium storage availability set single instance VM service level allows you to achieve 99.9% SLA with just a single VM but there is always a catch. previously if you needed to achieve 99.5%   Service Level Agreement ( SLA ) , that is 99.5% not 99.9%, you have to deploy two or more VMs running your workload inside of an availability set this would increase your cost. Availability Set ensures that your VMs are distributed across multiple fault domains in the Azure data centers as well as deployed onto hosts with different maintenance window.                                                          Note :  requirement for single instance VM SLA of 99.9% , the storage needs to be premium storage for all disks Why use single instance VM with 99.9% :  single instance ...

Azure Availability

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Azure announced an industry leading single instance virtual machine Service Level Agreement of 99.9% provided you deploy the VM with premium storage for all disks. In order for your deployment to qualify for the standard 99.95% VM Service Level Agreement, you still need to deploy two or more VMs running your workload inside of an availability set. An availability set ensures that your VMs are distributed across multiple fault domains in the Azure data centers as well as deployed onto hosts with different maintenance windows. The full Azure SLA explains the guaranteed availability of Azure as a whole.