mean availability

In research, back-end nodes in the cluster-based Web server are took as the research object. The research goal is to improve the availability of the back-end nodes by reducing their MTTR ( mean time to repair).

以Web集群服务器的后端节点作为研究对象，通过减少后端节点的MTTR（Mean Time to Repair），来提高它们的可用性，从而提高整个集群服务器的可用性。

By concentrating on Mean Time to Repair ( MTTR) rather then Mean Time to Failure ( MTTF), we find that quick recovery reduces recovery time and thus offers higher availability.

通过关注平均修复时间，而不是平均故障时间，发现快速的恢复减少了恢复时间，因而提供了更高的可用性。

Finally obtain the mean time between failures ( MTBF), mean time of repair failures ( MTTF), inherent availability ( A) as well as reliability index such as reliability and failure rate function according to the distribution model.

最后根据分布模型计算得到该加工中心的故障间隔时间（MTBF）、平均维修时间（MTTF）、固有可用度A以及可靠度和失效率函数等可靠性指标。

If you have mean time to failure and mean time to recovery information, enter that and the spreadsheet will calculate the availability for you in the "Calculated availability contributions" lines.

如果有平均失效到达时间和平均恢复时间信息，输入到表格中将计算出“计算出的可用性贡献”行。

This provides an availability figure based on mean time to failure information in days, and mean time to recover information in hours.

它提供了一个基于数天内的平均失效时间信息和数小时内的失效恢复信息的可用性特性。