Windows Azure has created lot of interest and folks are looking forward to move to Azure. I belong to Operation Engineer community and this community has lots of excitement over Azure because kind of scalability, fault tolerance and business continuity it provides is amazing. Top of that Azure made life easier as no more waiting for months to procure HW and then after maintaining long server inventory.
One of the first and most common questions I hear from PM / Business and Operation team is how to plan Infrastructure for Azure. In this article I would try to answer some of the basic concept of Azure on compute and infrastructure Planning, costing and SLA.
Windows Azure is an open and flexible cloud platform that enables you to quickly build, deploy and manage applications across a global network of Microsoft-managed datacenters. You can build applications using any language, tool or framework.And you can integrate your public cloud applications with your existing IT environment.Windows Azure delivers a 99.95% monthly SLA and enables you to build and run highly available applications without focusing on the infrastructure. It provides automatic OS and service patching, built in network load balancing and resiliency to hardware failure.
The core services needed for an Azure Application deployment are following. We will discuss about each of them in detail.
This is how a typical Windows Azure Service Architecture looks like
Each Compute instance is a virtual machine that isolates you from other customers. Once Compute resources are assigned to your application, Windows Azure automatically handles network load balancing and failover to provide continuousavailability. Windows Azure provides a 99.95% monthly SLA. for Compute services.
Applications in Windows Azure utilize Compute resources through one or more Compute containers called “roles”. Roles come in three different types: Web, Worker and Virtual Machine (VM). Some common uses or application patterns for theseroles include:
To conclude this is place where your FE and MT will go. You may have one Web Role performing role of FE and MT. Or you may like to keep your FE on web role and MT on worker role.
Virtual Machine Size
Disk Space for Local Storage Resources in Web and Worker Roles
Disk Space for Local Storage Resources in a VM Role
Allocated Bandwidth (Mbps)
Cost Per Hour
19 GB (6 GB reserved for system files)
224 GB (6 GB reserved for system files)
489 GB (6 GB reserved for system files)
999 GB (6 GB reserved for system files)
1.9 TB (6 GB reserved for system files)
Compute hours are charged only when your application is deployed. Compute hours are billed based on the number of clock hours your service was deployed multiplied by the number of compute instances. hAll compute hours are converted into small instance hours when presented on your bill.
SQL Azure is a highly available and scalable cloud database service built on SQL Server technologies. With SQL Azure, developers do not have to install, setup or manage any database. High availability and fault tolerance is built-in and no physical administration is required. SQL Azure is a managed service that is operated by Microsoft and has a 99.9% monthly SLA.
SQL Azure supports a flexible subscription-based pricing model and supports both a pay-as-you-go and 6 month commitment offer. SQL Azure can be purchased independently or with other Windows Azure platform products. You can provision multiple SQL Azure databases for your application(s) and can use either the Web or Business Edition offering. The Web Edition supports up to a 5 GB maximum T-SQL based relational database. The Business Edition supports up to a 150 GB maximum size T-SQL-based relational database.
Price Per Database Per Month
0 to 100 MB
Greater than 100 MB to 1 GB
Greater than 1 GB to 10 GB
$9.99 for first GB, $3.996 for each additional GB
Greater than 10 GB to 50 GB
$45.954 for first 10 GB, $1.998 for each additional GB
Greater than 50 GB to 150 GB
$125.874 for first 50 GB, $0.999 for each additional GB
Customers are billed based on the peak database size in a day. SQL Azure Database is charged as a monthly fee for each database, but that database fee is amortized over the month and charged on a daily basis. For databases greater than 1 GB, you will be billed in the next whole gigabyte increment.
For example, if you utilized two Business Edition databases, one that was 4.4 GB and one that was 14.4 GB for 1 day during a billing month, you would be charged for a 5 GB and 15 GB database for that day, which would total $2.643. Below are the calculations:
Storage provides secure, scalable and easily accessible storage services that remain highly available and durable. The Storage service supports virtually all types of storage needs, from structured to unstructured data, NoSQL databases, and queues. Storage is a managed service and has a 99.9% monthly SLA. Some practical uses for the Storage include:
Standard pay-as-you-go pricing for storage
$0.125 per GB stored per month based on the daily average
$0.01 per 10,000 storage transactions
For calculating prices refer to http://www.windowsazure.com/en-us/pricing/calculator/. For more details on pricing please refer http://www.windowsazure.com/en-us/home/features/compute/.
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