.\"
.\" Copyright (c) 2004 3ware, Inc.
.\" Copyright (c) 2000 BSDi
.\" All rights reserved.
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.\" $FreeBSD: src/share/man/man4/twa.4,v 1.4 2005/02/27 13:14:28 brueffer Exp $
.\" $DragonFly: src/share/man/man4/twa.4,v 1.1 2006/04/30 18:46:39 swildner Exp $
.\"
.Dd August 15, 2004
.Dt TWA 4
.Os
.Sh NAME
.Nm twa
.Nd 3ware 9000 series SATA RAID controllers driver
.Sh SYNOPSIS
.Cd "device twa"
.Sh DESCRIPTION
The
.Nm
driver provides support for the AMCC's 3ware 9000 series SATA controllers.
.Pp
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
.Pa /dev/twa Ns Ar X ,
where
.Ar 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,
.Pa /dev/da Ns Ar Y ,
where
.Ar Y
is the logical unit number.
.Sh HARDWARE
The
.Nm
driver supports the following SATA RAID controllers:
.Pp
.Bl -bullet -compact
.It
AMCC's 3ware 9500S-4LP
.It
AMCC's 3ware 9500S-8
.It
AMCC's 3ware 9500S-8MI
.It
AMCC's 3ware 9500S-12
.It
AMCC's 3ware 9500S-12MI
.El
.Sh DIAGNOSTICS
Whenever the driver encounters a command failure, it prints out an error code in
the format:
.Qq Li "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
.Dv TWA_DEBUG
defined, it prints out a whole bunch of debug
messages, the quantity of which varies depending on the value assigned to
.Dv TWA_DEBUG
(0 to 10).
.Sh AUTHORS
The
.Nm
driver and manpage were written by
.An Vinod Kashyap Aq vkashyap@FreeBSD.org .