早在2015年的时候，随着阿里云业务突飞猛进的发展，SQL Server业务也积累了大批忠实客户，其中一些体量较大的客户，在类似大促的业务高峰时，RDS的单机规格（规格是按照“内存*CPU*IOPS”一定比例分配，根据底层资源不同都会有各自上限）已经不能满足用户的业务需求，在我们看来也需要做Scale Out了。

但SQL Server并没有完备的中间件产品，所以无论是逻辑Sharding还是只读分离，都需要用户配合做应用改造，而从用户角度看Sharding改动量很大，不是一时间能完成的，那么更多是寄希望于我们来提供读写分离的方案，满足业务需求。

那么读写分离，我们第一个想到的即是AlwaysOn技术。但由于当时AlwaysOn对域控和Windows群集都是强依赖，而这两者又对我们所依赖的基础设施有很大挑战，需要做很多突破产品限制的非标准化操作才有可能实现，并且还有安全风险。所以最后我们只能放弃AlwaysOn技术方案，重新设计方案帮助用户度过难关。
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