If you know the meantimebetweenfailures and the meantime to recovery, e.g. for the hardware, use the calculations in this section.
如果知道失效之间的平均时间和平均恢复时间(例如对于硬件)，则使用这一部分中的计算方法。
2
Even though the meantimebetweenfailures of the hardware hasn't changed, the backups and scripts put in place mean that the data is safe and that you can quickly rebuild the environment, if needed.
尽管硬件平均故障时间没有改变，做足备份和脚本工作可确保数据是安全的，您可以根据需要快速重建环境。
3
When purchasing a piece of hardware, consider its meantimebetweenfailures (MTBF), and stockpile reserves accordingly. Here are some rules of thumb.