出现问题；请返回并更正任何错误: Can not create storage pool through host 1 due to Catch Exception com.cloud.utils.exception.CloudRuntimeException, create StoragePool failed due to com.cloud.utils.exception.CloudRuntimeException: Unable to create NFS SR Pool[202|192.168.1.101:2049|/mnt/primary] on host:50d1272b-9acb-4c27-b1d3-b338de4ed156 pool: 192.168.1.101/mnt/primary
*使用XenServer ，其中primary是不是必须建立一个SR？*
