具有实时特性的SLA设计

Design of real-time service level agreement

分析了具有实时特性的服务等级协议(SLA),提出了一种具有实时特性的SLA模型,此模型由参与方信息、服务描述及违例处理三部分组成,其中,时间限制参数(TimeConstrain)描述时间参数,实现服务的实时请求,通过服务参数的定义,为不同等级的用户提供不同的服务质量.从网格服务运行的网络时延和服务实际执行时间两方面分析了实时特性SLA的运行策略,制定了相应的匹配调度策略、评估策略及违例处理策略,保证服务按时完成.性能测试结果表明该设计在保证服务实时性上具有一定的优势.

A real-time SLA model and its mechanisms were brought forward, provided with corresponding scheduling strategies for the support of real-time services from two sides of network delay and executing time. The model is composed of parties information, service description and obligation processing, in which time contrain is used to response real-time requests with time description and afford different quality of service with the definition of service parameters. The performance evaluating showed that the SLA model and algorithms have advantage of guaranteeing real-time characteristics for services.