问题
I'm currently working with Azure (benefit from my MSDN subscription) and trying to deploy three Centos 7.2 VMs (F8 Standard size) in one region.
Unfortunately I can only deploy two of those VMs. When I want to deploy the third VM I cannot select F8 Standard as the size. It is greyed out and says "Not available". What I can do is deploy another VM with size F8 Standard in another region.
What is the deal with it? I cannot go cross-region as I need one file share across the three VMs.
回答1:
By default, Azure supports 20 cores per region. You could use Get-AzureRmVMUsage -Location yourregion to check.
F8 series VM has 8 cores, 3*8=24, so you could not create 3 F8 series VM in one region.
The maximum cores can be supported by Azure is 10000 per subscription.
Resource Default Limit Maximum Limit
Cores per subscription 20 10,000
More information about Azure limitions please refer to this link.
If you want to raise the limit or quota above the Default Limit, open an online customer support request at no charge. The limits can't be raised above the Maximum Limit value.
Notes:Free Trial subscriptions are not eligible for limit or quota increases.
回答2:
There is a core quota on the subscriptions. Assuming you are the same as my subs, then 2x8 is 16 of 20 cores by default. Contact Microsoft and have it upped as required.
回答3:
Yes, there is a long standing 20 core limit per subscription, this blog article describes this in more detail Understanding Azure Limits and Increases. This can be raised if needed
来源：https://stackoverflow.com/questions/41983698/azure-vm-size-not-available