Add two new manual pages. Welcome the ida(4) and iir(4) manual pages.

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+.\" $FreeBSD$
+.\" Written by Tom Rhodes
+.\" This file is public domain
+.\"
+.Dd January 05, 2003
+.Dt IDA 4
+.Os
+.Sh NAME
+.Nm ida
+.Nd Compaq Intelligent Drive Array Controllers
+.Sh SYNOPSIS
+For one or more devices:
+.Cd device scbus
+.Cd device ida
+.Sh DESCRIPTION
+.Pp
+The Compaq Intelligent Drive Array (IDA) technology is used to
+distribute data across an array of hard drives.
+It unites these hard drives into one or more high-performance logical drives.
+The drive array is managed by an array controller.
+.Pp
+These controllers have the ability to provide fault tolerance for the connected
+drives and optionally provide write cache for the logical drives.
+It is also possible for an application to access the SCSI bus subsystem directly by
+using the pass-through interface.
+.Sh IMPLEMENTATION NOTES
+Extreme caution should be exercised when using the pass-through interface.
+It is possible to interfere with normal system I/O and cause hangs if
+pass-through is used to an active device.
+Pass-through should only be used to a device that is otherwise quiescent.
+.Sh COMPATIBILITY
+.Pp
+The following controllers are supported by the
+.Nm
+driver:
+.Bl -tag -compact -width "Supported Devices"
+.It Compaq SMART Array 221
+.It Compaq Integrated SMART Array Controller
+.It Compaq SMART Array 4200
+.It Compaq SMART Array 4250ES
+.It Compaq SMART 3200 Controller
+.It Compaq SMART 3100ES Controller
+.It Compaq SMART-2/DH Controller
+.It Compaq SMART-2/SL Controller
+.It Compaq SMART-2/P Controller
+.It Compaq SMART-2/E Controller
+.It Compaq SMART Controller
+.El
+.Sh SEE ALSO
+.Xr cam 4 ,
+.Xr pass 4 ,
+.Xr xpt 4 ,
+.Xr camcontrol 8 .
+.Sh AUTHORS
+The
+.Nm
+driver was written by
+.An Jonathan Lemon Aq jlemon@FreeBSD.org
+and
+.An Matthew N. Dodd Aq mdodd@FreeBSD.org .
+This manual page was written by
+.An Tom Rhodes Aq trhodes@FreeBSD.org .