ascp4: Transferring from the Command Line with Ascp 4 Ascp 4 is a FASP transfer binary similar to Ascp but it has different strengths as well as capabilities that are unavailable with Ascp. Introduction to Ascp 4 Ascp 4 is a FASP transfer binary that is optimized for sending extremely large sets of individual files. The executable, ascp4, is similar to ascp and shares many of the same options and capabilities, in addition to data streaming capabilities. Ascp 4 Command Reference Supported environment variables, the general syntax, and command options for ascp4 are described in the following sections. ascp4 exits with a 0 on success or a 1 on error. The error code is logged in the ascp4 log file. Ascp 4 Transfers with Object Storage Files that are transferred with object storage are sent in chunks through the Aspera Trapd service. By default, ascp4 uses 64 KB chunks and Trapd uses 1 MB chunks; this mismatch in chunk size can cause ascp4 transfers to fail. Ascp 4 Examples Built-in I/O Providers Input/Output providers are library modules that abstract I/O scheme in Ascp 4 architecture. Ascp 4 has the following built-in I/O providers: Data Streaming Command Syntax The ascp4 that is installed with HST Server can be used for data streaming as well as regular file transfers. The command line is similar to a regular ascp4 file transfer, but the source and destination are URI paths. The license prohibits video streaming. A separate product, IBM Aspera Streaming for Video, is available for video streaming. For more information, see the IBM Aspera Streaming for Video User Guide. Ascp 4 Data Streaming Examples Use the following examples as a guide for creating your own streaming transfers with Ascp 4. Configuring macOS Server for Multicast Streams If you are sending or receiving multicast streams from a macOS server, multicast fails if the receiving or sending interface is not the macOS default interface. If no default gateway is defined on a macOS server, the default interface is en0. To use a different interface than the default, change the default interface for your server Troubleshooting Stream Transfers Using Ascp 4 from the GUI By default, transfers that are started in the GUI use Ascp and Ascp 4 transfers can be run only from the command line. You can make transfers that are started in the GUI use Ascp 4 by renaming the executables.