最大的挑战——首先,算出在不降低“应用程序服务等级(Application Service Levels)”的情况下,你能借助使用更多的虚拟机器(Virtual Machine,VM)而省掉的实际物理服务器数量。
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The runtime component has the workflows to be executed in response to defined events to make sure application service levels are met during runtime automatically without human intervention.
运行时组件包含在响应已定义事件时执行的工作流,用来确保在运行时自动地满足应用程序服务水平要求,不需要人工干预。
Not to mention that cloud providers need the ability to handle production exceptions, manage application and workload service levels and resources, and schedule activities without human intervention.
更不用说,云计算提供商必须能够在没有人工干预的情况下处理生产意外、管理应用程序和工作负载服务水平和资源以及调度活动。
Thus, you can identify at least two levels of service abstraction, namely the high level of activities and the low level of application services manipulated by activities.
因此,您至少可以确定两个级别的服务抽象,即高级活动和由活动所操作的低级应用程序服务。
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