XenServer导入ovf虚拟机失败，怎么解决

2020-07-27 15:40:46,130 ERROR XenOvfTransport.iSCSI [15] - Failed to start Transfer VM. There was a failure communicating with the plugin.
2020-07-27 15:40:46,130 ERROR XenOvfTransport.Import [15] - Failed to import a virtual disk over iSCSI. Failed to start Transfer VM.
2020-07-27 15:40:46,133 INFO XenAPI.Session [15] - Invoking XML-RPC method session.get_this_host
2020-07-27 15:40:46,136 ERROR XenOvfTransport.Import [15] - Failed to import.
2020-07-27 15:40:46,136 ERROR XenOvfTransport.Import [15] - Failed to add resource Hard Disk Image. Failed to import.
2020-07-27 15:40:46,136 ERROR XenOvfTransport.Import [15] - Failed to import virtual disk from file CentOS_8.1-disk1.vmdk to storage repository 57880057-6883-f79d-a14c-c939719e80d2.
2020-07-27 15:40:46,136 INFO XenAPI.Session [15] - Invoking XML-RPC method VM.destroy
2020-07-27 15:40:46,190 ERROR XenOvfTransport.Import [15] - Failed to import.
2020-07-27 15:40:46,190 ERROR XenAdmin.Actions.AsyncAction [15] -
System.Exception: Failed to import.
---> System.IO.InvalidDataException: Failed to add resource Hard Disk Image.
---> System.Exception: Failed to import.
---> System.Exception: Failed to import virtual disk file.
---> System.Exception: Failed to import a virtual disk over iSCSI.
---> System.Exception: Failed to start Transfer VM.
---> XenAPI.Failure: There was a failure communicating with the plugin.