Example of server groups are groups of NDBD nodes in a mysql cluster, groups of manager nodes in a mysql cluster, groups of jboss nodes in a jboss cluster, and so forth.

服务器组的示例包括mysql集群中的ndbd节点组、mysql集群中的manager节点组、jboss集群中的jboss节点组等等。

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For example, a mysql-cluster-based database tier would be comprised of two server groups, an NDBD group and a manager group.

例如，基于mysql集群的数据库层可能包含两个服务器组，一个ndbd组和一个manager组。

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What do the different computers do in a MySQL Cluster?

集群中的计算机都是干吗的？

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