The essence of high availability

I occasionally read an article sent by Alibaba technology today 《 High availability essence 》, I think it's well written , It shows the essence of stability , To sum up .

The risk expectation value indicates the potential hazard degree of the risk , Its components and calculation formula are shown in the figure below ：

According to the above definition , If the system wants to achieve high availability , Need to constantly reduce the total expectation of risk , That is, consider from four dimensions ： Reduce the number of risks 、 Reduce the risk of failure 、 Shorten the duration of influence and reduce the scope of fault influence , At the same time, it summarizes the high availability architecture design 7 The big core principle is shown in the figure below ：

The above principles are enough to guide the stability construction of our system ！

Reference resources ： High availability essence ：https://mp.weixin.qq.com/s/CkFHTuxqoj1WJ7d0HUEbAg

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