How to control replication on server?

[alexinc-2000]

English:
Good day.
There are a couple of questions.

1. Could you please explain how replications on servers can be controlled? For example, there are 5 storage servers and I need to always have 2 replications on these servers, no more. What is the best way to achieve this? Can I manually specify replication servers? For example, one contains a replica in one data center and the second one is directed to another.
2. Is there any utility/interface or API where I can view the storage state? For example, to find out if one of the disks is dropped or not in replication state?
   中文：
   下午好。
   有几个问题。
3. 请解释一下如何控制服务器上的复制？例如，有 5 台存储服务器，我需要在这些服务器上始终有 2 个复制，不能再多了。实现这一目标的最佳方法是什么？能否手动指定复制服务器？例如，在一个数据中心包含一个复制，然后将第二个复制指向另一个数据中心。
4. 是否有任何实用程序/接口或应用程序接口可以查看存储的状态？例如，了解其中一个磁盘是否掉线或不在复制状态？