数据要从成百上千台计算机中采集。那就是虚拟化。虚拟化通过在服务器和存储区域网络(SAN)之间创立一抽象层以利用SAN所提供的连接性。在引入SAN之前,存储直接附在服务器上,剩余的容量不能在服务器之间分享。为了避免超出空间的中断,每一服务器都配备了额外的存储容量,直接附属存储的 Data needs to be collected from hundreds of computers. That’s virtualization. Virtualization takes advantage of SAN-provided connectivity by creating an abstraction layer between servers and storage area networks (SANs). Storage was attached directly to the server before the SAN was introduced, and the remaining capacity could not be shared between servers. To avoid out-of-space interruptions, each server is equipped with additional storage capacity that is directly attached