リファレンス：
https://azure.microsoft.com/sv-se/blog/azure-availability-zones-expand-with-new-services-and-to-new-regions-in-europe-and-united-states/
https://azure.microsoft.com/en-us/blog/sap-on-azure-architecture-designing-for-performance-and-scalability/
https://wiki.scn.sap.com/wiki/pages/viewpage.action?pageId=360974069
https://docs.microsoft.com/en-us/azure/virtual-machines/workloads/sap/sap-ha-availability-zones#:~:text=In%20some%20Azure%20regions%2C%20the%20network ％20latency％20among％20the％20three、2％20milliseconds％20is％20not％20correct。