Affinity goup, availability set and the concept of Update Domain and Fault Domain

Question

Can 2 VM belonging to the same affinity group, belong to the same
availability set?
I have read (http://social.technet.microsoft.com/wiki/contents/articles/7916.importance-of-windows-azure-affinity-groups.aspx)
Affinity groups are logical abstraction of the physical concept of
Containers (unit of compute) in Microsoft Datacenters.
How do then Update Domains and Fault Domains relate to this concept of Container?
Are there multiple Fault Domains in a Container?
Thanks,
Davide
System and Network Administrator - MCSA security, CCNA, VCP3, VCP4, MCITP Enterprise administrator

Answer 1

Hi Davide,
Thanks for posting!
>>Can 2 VM belonging to the same affinity group, belong to the same
availability set?
The answer is no. Base on my understanding, affinity group is to keep your VMs physically closer together within the datacenter. And your 2 VMs may be in one host OS. But if you use the Availability Set,  it could guarantees that your 2 VMs are
spread across multiple racks in the Windows Azure Data Centers.
>>How do then Update Domains and Fault Domains relate to this concept of Container?
>>Are there multiple Fault Domains in a Container?
For this issue, I recommend you refer to this documents  (http://azure.microsoft.com/en-us/documentation/articles/virtual-machines-manage-availability/
) and this blog (http://michaelwasham.com/windows-azure-powershell-reference-guide/understanding_configuring_availability_sets_powershell/
). At the same time, you could see this article (http://www.techbunny.com/2013/11/close-but-not-too-close-azure-affinity.html ) for digging deep understanding .
Hope this helps.
Regards,
Will
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