各大云厂商ECS高可靠性部署对比

华为云

目前支持Group（反亲和性组），同一个Group的ECS将被部署到不同的主机上，确保单一主机网路故障、断电、Host OS宕机等故障发生时，不影响业务；目前只支持创建实例时加入Group，实例创建完毕后不能加入或更换group；

Azure

Azure提出了故障域的概念，可以在实例创建时，或创建后，添加到availability set中，确保power和交换网络高可用（或许是通过将实例发放到不同机柜上实现）；

https://docs.microsoft.com/en-us/azure/virtual-machines/windows/manage-availability

Fault domains define the group of virtual machines that share a common power source and network switch. By default, the virtual machines configured within your availability set are separated across up to three fault domains for Resource Manager deployments (two fault domains for Classic). While placing your virtual machines into an availability set does not protect your application from operating system or application-specific failures, it does limit the impact of potential physical hardware failures, network outages, or power interruptions