When staging is set to NO, staging is not used if not explicitly requested by the client.
When staging is set to YES (default), staging is used when needed.
Third party file transfer clients can request staging with the following file transfer advice string:
or in short:
If the file transfer client uses SFTP protocol for transferring the file and accesses the file or dataset in correct order, staging is not needed. However, if the client accesses file data in random offsets, staging is necessary when datasets are involved or conversions are used.