With redundancy being the key feature of an ha cluster, the components that are essential in this example are node management, a distributed file system, volume management, and monitoring.

由于冗余是ha集群的关键特性，因而在这个例子中基本的组成部分包括节点管理、分布式文件系统、卷管理和监控。

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Using the rolling upgrade feature allows you to upgrade the cluster with zero or minimal down time.

使用滚动升级特性允许您使用最少的、甚至零停机时间升级集群。

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Fixed node Hierarchy: This feature supports the ability to determine cluster leadership, auto merge groups, and node discovery where multicast might not work.

固定的节点层级：这一特性支持确定集群领导、自动合并组以及在多点传送不工作的地方发现节点。

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Its most becoming feature is a cluster of five mature linden trees that serve as a screen, covering the cars and trucks rolling into the tunnel's entrance.

WSJ: In Lower Manhattan, a New Public Space Near the Holland Tunnel

The distinctive feature of the City cluster is the pre-eminence of foreign financial firms.

ECONOMIST: London as a financial centre

There's a Brake Coach feature on the left cluster, while the right cluster is home to an image of green leaves that represents general fuel efficiency.

ENGADGET: Ford C-MAX Energi plug-in hybrid test drive (video)