如何选择正确的服务结构可靠性层？

Question

我正在阅读有关Service Fabric群集容量，可靠性层和持久层的the article。这篇文章（在撰写本文时）列出了以下几个层次：

• Platinum - 运行目标副本集数为9的系统服务
• Gold - 运行目标副本集数为7的系统服务
• Silver - 运行目标副本集数为5的系统服务
• 铜牌 - 运行目标副本集数为3的系统服务

使用高可靠性等级（如Platinum）是否存在劣势 / 性能影响？我创建了几个跨越至少50-100VM的集群，并结合了无状态和有状态服务。

Answer 1

Not really. Yes, technically the replication of changes to the system services will take longer, however in practice this has not made a significant difference in the performance of the system services. The replicas are almost always in a set of ~5 physical racks, the data is stored on local disks, so the performance tradeoff is (usually) more than worth the safety gained. YMMV of course.