In this article, you've learned about the flexibility of asynchronous replication using er and the high-availability features of a cluster.
在本文中，我们了解了使用ER实现异步复制的灵活性和集群的高可用性特性。
This article focuses on one of those features: upgrading a high availability cluster while it is online.
本文主要关注其中一个特性：在线升级高可用性集群。
Version 11.70 of Informix database software provides multiple features to ensure uninterrupted availability of a high availability cluster.
Informix数据库11.70版提供多个特性来确保高可用性集群的不间断可用性。
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