[Windows Azure] Virtual Machine and Cloud Service Sizes for Windows Azure

Virtual machine size	CPU cores	Memory	OS disk space– cloud services	OS disk space– virtual machines	Max. data disks (1 TB each)	Max. IOPS (500 per disk)
ExtraSmall	Shared	768 MB	19 GB	20 GB	1	1x500
Small	1	1.75 GB	224 GB	70 GB	2	2x500
Medium	2	3.5 GB	489 GB	135 GB	4	4x500
Large	4	7 GB	999 GB	285 GB	8	8x500
ExtraLarge	8	14 GB	2,039 GB	605 GB	16	16x500
A6	4	28 GB	999 GB	285 GB	8	8x500
A7	8	56 GB	2,039 GB	605 GB	16	16x500

Deployment considerations

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• Small is the smallest size recommended for production workloads.
• Select a virtual machine with 4 or 8 CPU Cores when using SQL Server Enterprise Edition.
• The ExtraSmall virtual machine size is only available by using Windows Azure SDK version 1.3 or later.
• Cloud service role instances (Web Roles and Worker Roles) require more disk space than a virtual machine due to system requirements. The system files reserve 4 GB of space for the Windows pagefile, and 2 GB of space for the Windows dumpfile.
• Some of the physical hosts in Windows Azure data centers may not support larger virtual machine sizes, such as A6 and A7. As a result, you may see the error message Failed to configure virtual machine <machine name> or Failed to create virtual machine <machine name> when resizing an existing virtual machine to a new size, creating a new virtual machine in a virtual network created before April 16, 2013, or adding a new virtual machine to an existing cloud service. See the topic Error: “Failed to configure virtual machine” on the support forum for a list of workarounds for each deployment scenario.