Anyone who has administered a system of commercial importance knows the value of uptime - or, conversely, knows the headaches you get from users because of downtime.

• 任何管理过具有商业重要性的系统的人都知道计算机正常运行时间的价值或者反过来讲,知道用户因故障时间会给您带来诸多头痛问题。