以计算为中心
“A technology that harnesses the power of supercomputers or computer clusters to solve complex problems requiring massive computation.” (IBM)
以数据(存储)为中心
“A network of computing and storage resources that enable the delivery of shared applications and data.” (CISCO)
多副本情况下的高可靠、低延迟数据访问
在服务海量地理分布请求的前提下
比如在数据中心的情况下: