TWA(4) MidnightBSD Kernel Interfaces Manual TWA(4)


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


device twa


The twa driver provides support for AMCC’s 3ware 9000/9500/9550 series SATA controllers.

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


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 〈〉.

MidnightBSD 0.3 February 20, 2006 MidnightBSD 0.3