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+.\" Copyright (c) 2000 Scott Long
+.\" All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.\" $FreeBSD$
+.Dd September 24, 2000
+.Dt AAC 4
+.Os
+.Sh NAME
+.Nm aac
+.Nd Adaptec AdvancedRAID Controller driver
+.Sh SYNOPSIS
+.Cd options AAC_COMPAT_LINUX
+.Cd options AAC_DEBUG=N
+.Cd device pci
+.Cd device aac
+.Sh DESCRIPTION
+The 
+.Nm
+driver provides support for the Adaptec AAC family SCSI Ultra2 and Ultra160
+RAID controllers.  
+These controllers support RAID 0, 1, 5, 10, and volume sets.
+They have four channels in the add-in version
+or 1-2 channels in the motherboard integrated version,
+and are most often found relabelled by Dell or Hewlett-Packard.
+Supported controllers include:
+.Bl -bullet
+.It
+AAC-364
+.It
+AAC-3642
+.It
+HP NetRAID 4M
+.It
+Dell PERC 2/Si
+.It
+Dell PERC 2/QC
+.It
+Dell PERC 3/Si
+.It
+Dell PERC 3/Di
+.Pp
+.El
+Access to RAID containers is available via the
+.Pa /dev/aacd?
+device nodes.
+Individual drives cannot be accessed 
+unless they are part of a container or volume set,
+and non-fixed disks cannot be accessed.  
+Containers can be configured by using
+either the on-board BIOS utility of the card, 
+or a Linux-based management application.
+.Pp
+The
+.Pa /dev/aac?
+device nodes provides access to the management interface of the controller.  
+One node exists per installed card.
+Compiling the driver with the
+.Dv AAC_COMPAT_LINUX
+option enables the Linux-compatible 
+.Xr ioctl 2
+interface for the management device.  
+The 
+.Xr ioctl 2 
+command set is heavily tailored to existing linux applications.  
+Native
+.Xr ioctl 2 
+support is not present at this time.
+.Sh FILES
+.Bl -tag -width /boot/kernel/aac.ko -compact
+.It Pa /dev/aac?
+aac management interface
+.It Pa /dev/aacd?
+disk/container interface
+.It Pa /boot/kernel/aac.ko
+aac loadable module
+.El
+.Sh DIAGNOSTICS
+Compiling with
+.Dv AAC_DEBUG
+set to a number between 0 and 3 
+will enable increasingly verbose debug messages.
+.Pp
+The adapter can send status and alert messages asynchronously 
+to the driver.  These messages are printed on the system console,
+and are also queued for retrieval by a management application.
+.Sh SEE ALSO
+.Xr kld 4 ,
+.Xr linux 4,
+.Xr kldload 8
+.Sh HISTORY
+The
+.Nm
+driver first appeared in
+.Fx 5.0
+and is
+.Ud
+.Pp
+.Sh AUTHORS
+.An Mike Smith
+.Aq msmith@freebsd.org
+.An Scott Long
+.Aq scottl@freebsd.org
+.Sh BUGS
+This driver has not been tested on Alpha, though it should work.
+.Pp
+The controller is not actually paused on suspend/resume.  
+.Pp
+Adapter-initiated messages are not returned back to the controller, 
+possibly causing a resource leak on the controller.
+.Pp
+Unloading and reloading the driver as a kernel loadable module
+without rebooting the system is strongly discouraged.
+.Pp
+Only the Linux-compatible 
+.Xr ioctl 2 
+interface is implemented at this time.
+This is not a bug, but native
+.Xr ioctl 2
+support is desirable.