Windows Azure Virtual Machine Disk and Images

Posted: May 2, 2013 in Live in a Cloudy World, Windows Azure

With the release of Windows Azure Virtual Machine, the true meaning of the Cloud Computing
Infrastructure as a Service, you have to understand how it works so you can better develop and build better applications. In the following link, I have made some comparison between the Windows Azure Cloud Services and Windows Azure Virtual Machine. As in this post I will introduce Windows Azure Virtual Machine Disks and Images, I will also clarify how scalability works on the Virtual Machine and why Cloud Service is better in some cases.

First of all, let me clarify something that any Virtual Machine once created always run the SAN. I mean if you look on Amazon you will find them creating new SAN only for hosting the Virtual Machines on it (I am talking about Infrastructure as a Service not the platform where you can deploy your applications). If we are talking about Amazon you can find the SAN created and dedicated for these Virtual Machines called the S3. For Windows Azure, the Infrastructure as a Service or the Virtual Machine is based on Windows Azure Blob Storage. Each virtual machine has a certain number of disks where the data and the required applications are hosted, with maximum storage of 1 TB which is the maximum storage of a Windows Azure blob.

Talking about Windows Azure Virtual Machine images, let me just try to clarify it by an example. If you are well aware of the OOP, you write the class and then you can make several separate instances of it called the object. The same concept goes for the Windows Azure Images and Disks, you can have an image and you can create from it disks for your Virtual Machine. There are now several images created on the portal, you can check them they are related to Microsoft technology and non-Microsoft technologies too.

Now Talking about the Scalability the Windows Azure Virtual Machine has a maximum of 16 disks certainly that depends on the Virtual Machine Size, in other words as you increase the processing power of the Virtual Machine you will be able to attach more disks to it.  the extra small Virtual Machine has maximum of 1 Disk and the Extra Large Virtual Machine has 16 Disks with maximum storage capacity of 16 TB.  Now talking about the Windows Azure Cloud Service you will have the ability to scale the application as much as you need, not only 16 TB of storage.

Here is an example of how you can create a Virtual machine using an image already existing on the portal.

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