Using different regions to avoid vCPU limits when running multiple VMs is technically possible but may not entirely circumvent the limitations. Here's why:
1. Regional Quotas: Each region in cloud services like Azure has its own vCPU quotas. These quotas are enforced separately for each region, meaning that if you hit the vCPU limit in one region, you can deploy VMs in another region where the quota hasn't been reached[2]. However, you would need to request quota increases for each region individually if you exceed the default limits.
2. Performance Considerations: While deploying VMs across regions can help distribute the workload and avoid hitting regional vCPU limits, it doesn't eliminate the need for efficient resource allocation. Over-provisioning vCPUs within a region can still lead to performance issues, as VMs may wait for CPU time slots to become available[5].
3. Workload Distribution: If your workload is distributed across regions, ensure that each region has sufficient resources to handle the VMs without over-provisioning. This requires careful planning and monitoring of resource utilization to avoid performance degradation[4].
In summary, using different regions can help manage vCPU quotas by allowing you to deploy VMs where resources are available. However, it's crucial to monitor and manage resource allocation efficiently to avoid performance issues related to over-provisioning.
Citations:
[1] https://www.reddit.com/r/vmware/comments/hd2lr4/how_many_vcpu_can_i_assign_to_all_the_vms/
[2] https://learn.microsoft.com/en-us/azure/quotas/regional-quota-requests
[3] https://superuser.com/questions/1602681/what-are-the-limits-of-allocating-my-cpu-cores-to-vms
[4] https://www.reddit.com/r/virtualization/comments/115x88f/how_many_vcpus_should_i_assign_across_multiple/
[5] https://virtualizationreview.com/~/media/ECG/Tech%20Library%202013/04/DELL%20VKERNEL%20APRIL/Dell%20%20%20vCPU%20Sizing%20Considerations_0.ashx
[6] https://learn.microsoft.com/en-us/azure/aks/aksarc/concepts-support
[7] https://forum.proxmox.com/threads/physical-vs-virtual-cpu-limits.115474/
[8] https://www.examtopics.com/discussions/microsoft/view/38700-exam-az-104-topic-4-question-23-discussion/