Windows Azure Virtual Machine: Scalability & Availability

Posted: May 3, 2013 in Live in a Cloudy World, Windows Azure

We have introduced Windows Azure Virtual Machine as Microsoft Cloud Computing
infrastructure as a Service. Certainly you will have to have a Windows Azure Portal to work with it. One of the main features of Windows Azure Cloud Services on Windows Azure Virtual Machine is the Scalability. That doesn’t mean that Windows Azure Virtual Machine doesn’t allow scalable applications. For more information about the scalability I hope you can read about it in the Images and Disks blog post

For the availability, let’s first understand few things what is the Updated domains and the fault domains.

Fault Domain: mainly targets Hardware failures. For example you may have several instance on the same physical hardware resources, it is managed by the Fault Domain. This is to manage the high availability of the application just in case of the hardware failures.

Updated Domain: mainly is designed for the updates that goes for the virtual machines. When an update starts the updated or the upgraded domain (some people name it upgraded) makes sure that you will always have an instance of your application running while the other is being upgraded.

With the new General Availability that was released for both the Windows Azure Virtual machine and the Virtual Network, the SLA (service level agreement) offers 99.9% availability for the single instance of the Windows Azure Virtual Machine and 99.95% for the Availability Set (where you can create multiple Virtual Machine in it for the same tier).

Here is a good article that I do recommend you to read to get more information about this topic.

As we have previously created a Windows Azure Virtual machine from the SharePoint Images that already exists on the portal. Here is another example of how can you create another Virtual Machine to enhance your Virtual Machine availability.

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