The DS Network Interface server is unable to communicate with the storage unit or storage image that you specified because it is not known. You can submit the DS Command-Line Interface (CLI) lssu command to list all the storage units or the CLI lssi command to list all the storage images in a storage complex that are known to the DS Network Interface server.
Specify the correct storage unit or storage image ID and resubmit the task. If you cannot determine the storage unit or storage image ID, contact IBM technical support for assistance.