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     twa — 3ware 9000/9500/9550/9650 series SATA RAID controllers driver


     To compile this driver into the kernel, place the following lines in your kernel
     configuration file:

           device scbus
           device twa

     Alternatively, to load the driver as a module at boot time, place the following line in



     The twa driver provides support for AMCC's 3ware 9000/9500/9550/9650 series SATA

     These controllers are available in 4, 8, 12 or 16-port configurations, and support the
     following RAID levels: 0, 1, 10, 5, 50.  The device nodes for the controllers are of the
     form /dev/twaX, where X is the controller number.  The driver is implemented as a SCSI SIM
     under CAM, and, as such, the logical units that it controls are accessible via the device
     nodes, /dev/daY, where Y is the logical unit number.


     The twa driver supports the following SATA RAID controllers:

        AMCC's 3ware 9500S-4LP
        AMCC's 3ware 9500S-8
        AMCC's 3ware 9500S-8MI
        AMCC's 3ware 9500S-12
        AMCC's 3ware 9500S-12MI
        AMCC's 3ware 9500SX-4LP
        AMCC's 3ware 9500SX-8LP
        AMCC's 3ware 9500SX-12
        AMCC's 3ware 9500SX-12MI
        AMCC's 3ware 9500SX-16ML
        AMCC's 3ware 9550SX-4LP
        AMCC's 3ware 9550SX-8LP
        AMCC's 3ware 9550SX-12
        AMCC's 3ware 9550SX-12MI
        AMCC's 3ware 9550SX-16ML
        AMCC's 3ware 9650SE-2LP
        AMCC's 3ware 9650SE-4LPML
        AMCC's 3ware 9650SE-8LPML
        AMCC's 3ware 9650SE-12ML
        AMCC's 3ware 9650SE-16ML
        AMCC's 3ware 9650SE-24M8


     Whenever the driver encounters a command failure, it prints out an error code in the format:
     "ERROR: (<error source>: <error code>):", followed by a text description of the error.
     There are other error messages and warnings that the driver prints out, depending on the
     kinds of errors that it encounters.  If the driver is compiled with TWA_DEBUG defined, it
     prints out a whole bunch of debug messages, the quantity of which varies depending on the
     value assigned to TWA_DEBUG (0 to 10).


     The twa driver and manpage were written by Vinod Kashyap <>.