cloudstack 添加主机失败。

Question

按照官网cloudstack安装指南搭建了cloudstack环境，两台机子，management同时也作为NFS服务器，安装KVM和agent的机子作为host。但是一直都添加不上主机，日志中找到关键的两句
Skip capacity scan as there is no Primary Storage in 'Up' state
Failed to handle host connection: java.lang.IllegalArgumentException: Can't add host whose hypervisor type is: KVM into cluster: 2 whose hypervisor type is: None。我觉得应该是NFS配置出了问题。请大神指点