XenServer import ovf failed, how should solve-CodePudding

The 2020-07-27 15:40:46, 130 ERROR XenOvfTransport. ISCSI [15] - Failed to start Transfer the VM. There was a pool_raise_if_allocation_failure is communicating with the plugin.
The 2020-07-27 15:40:46, 130 ERROR XenOvfTransport. Import [15] - Failed to Import a virtual disk over iSCSI. Failed to start Transfer the VM.
The 2020-07-27 15:40:46, 133 INFO XenAPI. Session [15] - Invoking xml-rpc method Session. Get_this_host
The 2020-07-27 15:40:46, 136 ERROR XenOvfTransport. Import [15] - Failed to Import.
The 2020-07-27 15:40:46, 136 ERROR XenOvfTransport. Import [15] - Failed to add the resource Hard Disk Image. Failed to Import.
The 2020-07-27 15:40:46, 136 ERROR XenOvfTransport. Import [15] - Failed to Import virtual disk from the file CentOS_8. 1 - disk1. VMDK to storage repository of 57880057-6883 - f79d - a14c - c939719e80d2.
The 2020-07-27 15:40:46, 136 INFO XenAPI. Session [15] - Invoking xml-rpc method VM. Destroy
The 2020-07-27 15:40:46, 190 ERROR XenOvfTransport. Import [15] - Failed to Import.
The 2020-07-27 15:40:46, 190 ERROR XenAdmin. Actions. AsyncAction [15] -
System. Exception: Failed to import.
-- -> System. IO. InvalidDataException: Failed to add the resource Hard Disk Image.
-- -> System. Exception: Failed to import.
-- -> System. Exception: Failed to import the 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 pool_raise_if_allocation_failure is communicating with the plugin.

At XenAPI. Response ` 1. The parse ()
At XenAPI. Host. Call_plugin (Session Session, String _host, String _plugin, String _fn, Dictionary ` _args 2)
The at XenOvfTransport. ISCSI. StartiScsiTarget (Session xenSession, String vdiuuid, Boolean read_only)
- End of inner exception stack trace -- -- --
The at XenOvfTransport. ISCSI. StartiScsiTarget (Session xenSession, String vdiuuid, Boolean read_only)
The at XenOvfTransport. ISCSI. Connect (Session xenSession, String vdiuuid, Boolean read_only)
The at XenOvfTransport. Import. UploadiSCSI (Session xenSession, String sruuid, String label, Stream filestream, Int64 capacity, String description, String vdiuuid)
- End of inner exception stack trace -- -- --
The at XenOvfTransport. Import. UploadiSCSI (Session xenSession, String sruuid, String label, Stream filestream, Int64 capacity, String description, String vdiuuid)
The at XenOvfTransport. Import. ImportFile (Session xenSession, String vmname, String pathToOvf, String filename, String compression will String version, String passcode, String sruuid, String description, String vdiuuid)
- End of inner exception stack trace -- -- --
The at XenOvfTransport. Import. ImportFile (Session xenSession, String vmname, String pathToOvf, String filename, String compression will String version, String passcode, String sruuid, String description, String vdiuuid)
The at XenOvfTransport. Import. ImportFileProc (Object args)
- End of inner exception stack trace -- -- --
The at XenOvfTransport. Import. ImportFileProc (Object args)
The at XenOvfTransport. Import. AddResourceSettingData (Session xenSession, XenRef ` 1 vmRef, RASD_Type rasd, String pathToOvf, String filename, String compression will String version, String passcode)
- End of inner exception stack trace -- -- --
The at XenOvfTransport. Import. AddResourceSettingData (Session xenSession, XenRef ` 1 vmRef, RASD_Type rasd, String pathToOvf, String filename, String compression will String version, String passcode)
The at XenOvfTransport. Import. The Process (Session xenSession, EnvelopeType ovfObj, String pathToOvf, String passcode)
- End of inner exception stack trace -- -- --
The at XenOvfTransport. Import. The Process (Session xenSession, EnvelopeType ovfObj, String pathToOvf, String passcode)
The at XenAdmin. Actions. OVFActions. ImportApplianceAction. The Run ()
The at XenAdmin. Actions. AsyncAction. RunWorkerThread (Object o)
The 2020-07-27 15:40:46, 190 ERROR XenAdmin. Actions. AsyncAction [15] - at XenOvfTransport. Import. The Process (Session xenSession, EnvelopeType ovfObj, String pathToOvf, String passcode)
The at XenAdmin. Actions. OVFActions. ImportApplianceAction. The Run ()
The at XenAdmin. Actions. AsyncAction. RunWorkerThread (Object o)