环境描述
i2版本：7.1.X
源端：centos 7.5 x64
备机：centos 7.5 x64
功能：FFO备份为VMDK


问题描述
如下所示，FFO备份规则停止，备端报错中显示
Copy Virtual Disk: /usr/local/sdata/vmdk/CentOS/CentOS7x64_V-1.vmdk-....................., return 0
CMirrorNormalTask: vmdisk mapping error, return -2.
Write file list, err -9
ACK: peer 17, msg 1, code -9