Configure each application tier into separate availability sets

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If your virtual machines are all nearly identical and serve the same purpose for your application, we recommend that you configure an availability set for each tier of your application. If you place two different tiers in the same availability set, all virtual machines in the same application tier can be rebooted at once. By configuring at least two virtual machines in an availability set for each tier, you guarantee that at least one virtual machine in each tier is available.

For example, you could put all the virtual machines in the front end of your application running IIS, Apache, Nginx in a single availability set. Make sure that only front-end virtual machines are placed in the same availability set. Similarly, make sure that only data-tier virtual machines are placed in their own availability set, like your replicated SQL Server virtual machines, or your MySQL virtual machines.

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