z/OS Communications Server: IP User's Guide and Commands
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Testing throughput with *DEV.NULL

z/OS Communications Server: IP User's Guide and Commands
SC27-3662-00

You can use the Get or MVSGet subcommand to copy many files (or one large file) without storing the files in the client's file system. This is useful for testing purposes because you do not have to worry about allocating the disk space on the client system.

Procedure

  1. Change the working directory to *DEV.NULL by entering the following subcommand:
    LCD *DEV.NULL
    This affects the working directory for only the Get or MVSGet subcommand.
  2. Use the Get or MVSGet subcommand to copy the file to the client system. The input data set must be valid, and the output file can be a new or an existing file. In either case, the file is not actually stored. The following response shows information such as the number of bytes transferred and the rate of transfer.
    Command:
     lcd *dev.null 
     Working Directory for GET is NULL Device 
     for PUT is HFS directory /tmp 
     Command:
     get 'user2.junk(junk)' example 
     >>> EPSV 
     229 Entering Extended Passive Mode (|||1034|) 
     >>> RETR 'user2.junk(junk)' 
     125 Sending data set USER2.JUNK(JUNK) 
     250 Transfer completed successfully. 
     65 bytes transferred in 0.070 seconds. Transfer rate 0.93 Kbytes/sec.
     Command:
  3. To end the use of the *dev.null directory for the Get or MVSGet subcommand, issue another change local working directory subcommand.

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