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Device backup and other availability solutions are chosen to balance the value of having information available against the cost
Device backup and other availability solutions are chosen to balance the value of having information available against the cost
admin
2013-12-19
117
问题
Device backup and other availability solutions are chosen to balance the value of having information available against the cost of keeping that information available. Which of the following best describes fault-tolerant technologies?
选项
A、They are among the most expensive solutions and are usually only for the most mission-critical information.
B、They help service providers identify appropriate availability services for the specific customer.
C、They are required to maintain integrity, regardless of the other technologies in place.
D、They allow a failed component to be replaced while the system continues to run.
答案
A
解析
A正确。容错技术可以保证信息不仅在单个存储设备出现故障时可用,甚至可以在整个系统出现故障时也可用。容错是最昂贵的保持信息可用性的解决方案,通常仅用于最关键的任务信息。所有的技术最终都将经历某种形式的故障。如果一家公司遇到计划外的停机会遭受难以弥补的损害,那么这家公司才有使用高成本的容错系统的必要。
B不正确。因为服务等级协议(Service-Level Agreements,SLA)帮助服务提供者——无论是内部IT业务运营部门还是外包商——决定什么类型的可用性技术和服务是适合的。确定可用性技术和服务的类型,服务的价格或者IT运营部门的预算便可以定下来。开发业务的SLA过程对企业本身大有裨益。虽然有些企业已经意识到了这一点,但许多企业还没有。作为他们内部IT业务或者外部外包预算的一部分而被迫开发的SLA有助于该企业了解它的信息的真正价值。
C不正确。因为容错技术并不一定和数据或者系统完整性有关系。
D不正确。因为新增热插拔(hot-swappable)硬件不需要关闭系统,可能会、也可能不会被认为是容错技术。热插拔允许管理员在系统持续运行和信息仍旧可用时替换出现故障的组件,这样做通常会降低性能,但可避免出现计划外的停机时间。
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