我们如何计算 24/7 网站的正常运行时间？
当公司站出来声称99.98%时，他们是如何得出这个数字的？ 这是唯一的 QoS 参数还是还有其他有用且重要的参数？
When companies come forward and claim 99.98%, how do they come to that number? Is that the only QoS parameter or are there any other useful and important parameters?
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有几个有用的 QoS 参数，尽管并非所有参数都像 99.98% 的正常运行时间一样容易测量，很容易得出 - 99.98% 的时间，您的服务器可用。 其他指标：
然后还有一些不完全与 QoS 相关的托管问题：
There are several useful QoS parameters, although not all are as easily measured as e.g. 99.98% uptime, which is easily derived - 99.98% of the time, your server is available. Other metrics:
Then there are the fluffy not-entirely-QoS related hosting problems:
这意味着您每年的停机时间大约为 2 小时。 在 8760 小时内，可以放心地假设您的网站不会因为托管问题而损失太多流量或业务。
我会查看推荐或在线搜索该公司的评论以获取其他信息。
That means your downtime is going to be roughly 2 hours per year. Out of 8760 hours, it's safe to assume your website isn't going to lose much traffic or business because of problems in their hosting.
I would look at testimonials or search online for reviews of the company for anything else.
正常运行时间是服务质量指标之一。 其他有趣的数字包括“平均修复时间”、“平均故障间隔时间”和其他服务恢复数字。 理想情况下，会有人每天 24/7 保持清醒并发出警报以修复故障，但大多数地方（最多）都会有保持清醒的人员 24/7 监控服务，并让值班工程师进行实际修复（至少在以下情况下）这是一个更复杂的问题），因此了解非工作时间服务（如果他们会告诉您）也是选择提供商的一个因素。
Uptime is one quality of service figure. Other interesting figures are "mean time to fix", "mean time between failures" and other service restoration figures. Ideally, there would be people awake and alert 24/7 to fix faults, but most places will (at best) have alert and awake people monitoring the service 24/7 and have on-call engineers to do the actual fix (at least if it's a more complicated one), so knowing how out-of-hours service (IF they will tell you) is also a factor in choosing a provider.