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TWA(4)                   BSD Kernel Interfaces Manual                   TWA(4)

NAME
     twa -- 3ware 9000 series SATA RAID controllers driver

SYNOPSIS
     device twa

DESCRIPTION
     The twa driver provides support for the AMCC's 3ware 9000 series SATA
     controllers.

     These controllers are available in 4, 8 or 12-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 num-
     ber.  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.

HARDWARE
     The twa driver supports the following SATA RAID controllers:

     o   AMCC's 3ware 9500S-4LP
     o   AMCC's 3ware 9500S-8
     o   AMCC's 3ware 9500S-8MI
     o   AMCC's 3ware 9500S-12
     o   AMCC's 3ware 9500S-12MI

DIAGNOSTICS
     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).

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

BSD                             August 15, 2004                            BSD