For computers that expose their status through SNMP, there may be a discrepancy between system and SNMP agent uptime.

对于通过SNMP公开其状态的计算机，系统与SNMP代理正常运行时间之间可能存在偏差。

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Availability and reliability: Similar to performance and scalability, users expect solution uptime and reliability to be consistent with the current system.

可用性和可靠性：与性能和可伸缩性类似，用户希望解决方案具有与当前系统一致的正常运行能力和可靠性。

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For example, to get the system description and uptime, use the following command (in Listing 4).

例如，要获取系统描述和正常运行时间，可以使用以下命令(在清单4中)。

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The immediate consequence here is that Amazon EC2 customers will need to deploy copies of the same server instance in multiple regions to guarantee 100% system uptime, assuming, of course, that the wildly unlikely scenario that multiple Amazon cloud computing regions experience outages at the same time never transpires.

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Officials said the overall uptime for the order-routing system is 99.96% for the year thus far.

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