Choosing a command exit

You have a choice (in the TMM configuration) of whether to use no command exit, a local command exit running in the TMM with no subcommand capability, or a command exit running in the Command Management Machine (CMM) with subcommand capability. The subcommand capability provides a means for the command exit to issue Tape Manager commands.

The use of the CMM to run the command exit adds complexity and diminishes overall performance. It is recommended that this service machine be utilized only if either of the following is true:

  • A site requires a command exit that might have long running processes that could seriously impact the performance of the TMM if the command exit ran there.
  • A site requires a command exit and needs to issue Tape Manager commands from within the command exit.