Understanding availability set in Windows Azure

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I am reading the explanation of Availability Sets on Microsoft' website but can't 100% understand the concept.

http://www.windowsazure.com/en-us/documentation/articles/manage-availability-virtual-machines/

There are many questions people ask in comments, but there is no technical support from Microsoft is there to answer them.

As I properly understand with availability sets you can duplicate your VM with IIS application and VM with SQL, which means you have to use 4 VM(pay for 4) instead of 2. This means that whenever IIS1 virtual machine is down, website will still be online with help of IIS2 virtual machine and vice versa? Same goes for SQL1 and SQL2 virtual machines?

Am I going to the right direction? If this is the case, how do I keep the data synchronized in SQL1 and SQL2, IIS1 and IIS2 virtual machines at the same time, so website will still be up with latest data and code if one VM is down for updates?

azurevirtual-machineazure-availability-set

Mar 26 in Azure by Edureka
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