我可以启动简单、小型、单个 mongodb 实例，然后轻松切换到复制集，还是应该使其“可复制”？从第一天开始？
我需要尽快把事情做好，现在就完成。
稍后，比如说一个月或更短的时间，或者更长的时间，我将希望将我的数据库复制到更多的机器上。
我想知道，我是否可以简单地开始处理我的单个实例，然后开始担心复制，或者我现在需要考虑一些事情，以便以后更容易复制。
I need to get things done, quick and fast and now.
Later on, down the road, say in a month or less, or more, I will want to have my database replicated in few more machines.
I wonder, if I can simply start working on my single instance, and start worrying about replication later on, or there are things I need to take into account now to make it easier to replicate later on.
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您通常可以稍后再担心。如果您切换到副本集，您将必须重新启动 mongod 进程并在那时设置副本集。如果您想避免这种情况，您还可以考虑在一台计算机上简单地运行 3 成员复制集，以避免以后出现任何麻烦。
这应该可以让您很好地了解优点/缺点： http:// www.mongodb.org/display/DOCS/Upgrading+to+Replica+Sets
You mostly can worry about it later on. If you switch to replica sets you will have to restart your mongod process and set up a replica set at that time though. If you want to avoid that you can also consider simply running a 3 member replication set on a single machine to save yourself any headaches later on.
This should give you a good overview of the pros/cons : http://www.mongodb.org/display/DOCS/Upgrading+to+Replica+Sets
要添加@Remon的答案，您甚至可以将系统从单个节点（或单个副本集）转换为集群，甚至无需重新启动 mongod 实例（不过，您必须重新启动应用程序）。
To add to @Remon's answer, you can even convert your system from a single node (or a single replica set) to a cluster, without even restarting your mongod instances (you'll have to restart your app, though).