传统高可用系统存在可扩展性较差的问题。
Limited scalability is a common problem for traditional high availability systems.
文中还对高可用系统理论作了初步探讨，对系统可用度进行了分析。
He also makes some initial inquiry into the High availability theory and analysis of the availability of the system in the article.
传统的高可用系统的测试以手工测试为主，需要大量的人工参与，测试的过程不够规范。
Traditional High-Availability system testing is primarily base on manual testing, which is not normative enough.
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