The "Variant 1" calculation asks you to enter the number of servers you require in order to support your operating capacity (i.e. without any redundancy).
“变种1”计算要求您输入为了支持您的操作能力(也就是说没有任何冗余)需要的服务器数量。
2
To get high availability, adopting redundancy components, system backup, detection and recovery method, is cluster operating system's necessary function.