tw_cli(8) is a Command Line Interface Storage Management Software for
AMCC/3ware ATA RAID Controllers, supported by twe(4) and twa(4) drivers.
It provides controller, logical unit and drive management. tw_cli can
be used in both interactive and batch mode, providing higher-level API
(Application Programming Interface) functionalities.

WWW: http://3ware.com/support/download.asp