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-.\"	$NetBSD: ccd.4,v 1.5 1995/10/09 06:09:09 thorpej Exp $
-.\"
-.\" Copyright (c) 1994 Jason Downs.
-.\" Copyright (c) 1994, 1995 Jason R. Thorpe.
-.\" 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.
-.\" 3. All advertising materials mentioning features or use of this software
-.\"    must display the following acknowledgement:
-.\"	This product includes software developed for the NetBSD Project
-.\"	by Jason Downs and Jason R. Thorpe.
-.\" 4. Neither the name of the author nor the names of its contributors
-.\"    may be used to endorse or promote products derived from this software
-.\"    without specific prior written permission.
-.\"
-.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 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.
-.\"
-.Dd August 9, 1995
-.Dt CCD 4
-.Os NetBSD
-.Sh NAME
-.Nm ccd
-.Nd Concatenated Disk Driver
-.Sh SYNOPSIS
-.Cd "pseudo-device ccd 4"
-.Sh DESCRIPTION
-The
-.Nm
-driver provides the capability of combining one or more disks/partitions
-into one virtual disk.
-.Pp
-This document assumes that you're familiar with how to generate kernels,
-how to properly configure disks and pseudo-devices in a kernel
-configuration file, and how to partition disks.
-.Pp
-Note that the
-.Sq raw
-partitions of the disks
-.Pa should not
-be combined.  Each component partition should be offset at least one
-cylinder from the beginning of the component disk.  This avoids potential
-conflicts between the compoent disk's disklabel and the
-.Nm ccd's
-disklabel.  The kernel will only allow component partitions of type FS_BSDFFS.
-.Pp
-In order to compile in support for the ccd, you must add a line similar
-to the following to your kernel configuration file:
-.Bd -unfilled -offset indent
-pseudo-device	ccd	4	# concatenated disk devices
-.Ed
-.Pp
-The count argument is how many
-.Nm ccds
-memory is allocated for a boot time.  In this example, no more than 4
-.Nm ccds
-may be configured.
-.Pp
-A
-.Nm ccd
-may be either serially concatenated or interleaved.  If a
-.Nm ccd
-is interleaved correctly, a
-.Dq striping
-effect is achieved, which can increase performance.  The optimum interleave
-factor is typically the size of a track.  Since the interleave factor
-is expressed in units of DEV_BSIZE, one must account for sector sizes
-other than DEV_BSIZE in order to calculate the correct interleave.
-The kernel will not allow an interleave factor less than the size
-of the largest component sector divided by DEV_BSIZE.
-.Pp
-Note that best performance is achieved if all compent disks have the same
-geometery and size.  Optimum striping cannot occur with different
-disk types.
-.Pp
-There is a run-time utility that is used for configuring
-.Nm ccds .
-See
-.Xr ccdconfig 8
-for more information.
-.Sh WARNINGS
-If just one (or more) of the disks in a
-.Nm ccd
-fails, the entire
-file system will be lost.
-.Sh FILES
-/dev/{,r}ccd* - ccd device special files.
-.Pp
-.Sh HISTORY
-The concatenated disk driver was originally written at the University of
-Utah.
-.Sh SEE ALSO
-.Xr MAKEDEV 8 ,
-.Xr ccdconfig 8 ,
-.Xr config 8 ,
-.Xr config.old 8 ,
-.Xr fsck 8 ,
-.Xr mount 8 ,
-.Xr newfs 8 .