The redundant servers, #5 and #6, provide the ability to continue processing incoming requests, should two of the servers need planned or unplanned maintenance.

冗余服务器、#5 和 #6提供继续处理传入的请求的能力，其中两个服务器应该需要为计划的和未计划的维护作准备。

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Ensure all problems are corrected and reported and all plant mechanical equipment are in safe working condition while machine unplanned breakdown and maintenance cost are minimized.

确保解决和汇报所有问题和使所有工厂机械设备在安全工作状态当机器无计划故障和维修费用减到最小。

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Using the approach outlined in this series, you can significantly reduce planned and unplanned outages, allowing for cluster upgrades and system maintenance without interrupting operations.

使用本文中略述的方法，可以显著减少有计划的和无计划的停歇，从而无需中断操作就可以完成集群的升级和系统维护。

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