c# code 128 barcode generator How Windows Azure works in C#.NET

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How Windows Azure works
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The many sizes of roles
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Each role defined in your service model is basically a template for a server you want to be deployed in the fabric. Each role can have a different job and a different configuration. Part of that configuration includes local storage and the number of instances of that role that should be deployed. How these roles connect and work together is part of why the service model exists. Because each role might have different needs, there are a variety of VM sizes that you can request in your model. Table 3.1 lists each VM size. Each step up in size doubles the resources of the size below it.
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Table 3.1 The available sizes of the Azure VMs Dedicated CPU cores 1 2 4 8 Available memory 1.7 GB 3.5 GB 7 GB 15 GB Local disk space 250 GB 500 GB 1,000 GB 2,000 GB
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VM size Small Medium Large Extra large
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Each size is basically a slice of how big a physical server is, which makes it easy to allocate resources and keeps the numbers round. Because each physical server has eight CPU cores, allocating an extra-large VM to a role is like dedicating a whole physical machine to that instance. You ll have all the CPU, RAM, and disk available on that machine. Which size you want is defined in the ServiceDefinition.csdef file on a roleby-role basis. The default size, if you don t declare one, is small. To change the default size, add the following code, substituting ExtraLarge with the size that you want:
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<WorkerRole name="ImageCompresser" vmsize="ExtraLarge">
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If you re using Visual Studio 2010, you can define the role configuration by doubleclicking the name of your web role in the Roles folder of your Cloud Service project. Choose Properties and click the Configuration tab, as shown in figure 3.7. The service model is also used to define fault domains and update domains, which we ll look at next.
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Figure 3.7 Configuring your role doesn t have to be a gruesome XML affair. You can easily do it in Visual Studio 2010 when you view the properties information for the role you want to configure.
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It s not my fault
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It s not my fault
Fault domains and update domains determine what portions of your service can be offline at the same time, but for different reasons. They re the way that you define your uptime requirements to the FC and how you describe how your service updates will happen when you have new code to deploy. Let s examine each type of domain in detail. Then we ll present a service model scenario that shows you how fault and update domains help increase fault tolerance in your cloud service.
Fault domains
Fault domains are used to make sure that a set of elements in your service isn t tied to a single point of failure. Fault domains are based more on the physical structure of the data center than on your architecture. Your service should typically have three or more fault domains. If you have only one fault domain, all the parts of your service could potentially be running on one rack, in the same container, connected to the same switch. If there s any failure in that chain, there s a high likelihood of catastrophic failure for your service. If that rack fails, or the switch in use fails, then your service is completely offline. By breaking your service into several fault domains, the FC ensures that those fault domains don t share any dependent infrastructure, which protects your service against single points of failure. In general, the FC will define three fault domains, meaning that only about a third of them can become unavailable because of a single fault. In a failure scenario, the FC immediately tries to deploy your roles to new nodes in the fabric to make up for the failed nodes. Currently, the Azure SDK and service model don t let you define your own number of fault domains; the default number is thought to be three domains.
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