If you had noticed delays in updating failed servers in your R4.x environment, this should no longer be an issue.

如果您发现在R 4 . x环境中更新失败服务器出现延迟，那么不用担心以后会出现这种问题。

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However, this can only happen when replicas of the databases on the failed server are spread roughly equally across the other servers in the cluster.

然而，仅当失败服务器的数据库副本大致均匀地分布在集群的其他所有服务器中时，才能实现平均分配故障服务器的负载。

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If a hardware failure occurs, all the servers that are deployed on the failed hardware become unavailable.

如果发生硬件故障，那么部署在故障硬件上的所有服务器都将不能使用。

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The original team realized that introducing this technology into the commercial market could disrupt the status quo of traditional backup systems, which restore failed servers over a day or more.

FORBES: Tech CEO Shows How to Disrupt a Giant

They said the problem was that it then transmitted all the contained phone numbers to its servers, and failed to delete those belonging to people who had not signed up to the service.

BBC: Whatsapp

And it says BT failed to license a system used to let computer servers prioritise data - an IBM invention now owned by the search firm.

BBC: BT Tower