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-.\"	$OpenBSD: ccd.4,v 1.23 2007/05/31 19:19:49 jmc Exp $
-.\"	$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 $Mdocdate: May 31 2007 $
-.Dt CCD 4
-.Os
-.Sh NAME
-.Nm ccd
-.Nd concatenated disk driver
-.Sh SYNOPSIS
-.Cd "pseudo-device ccd" Op Ar count
-.Sh DESCRIPTION
-The
-.Nm
-driver provides the capability of combining one or more disks/partitions
-into one virtual disk.
-.Pp
-Note that the
-.Sq raw
-partitions of the disks
-.Em 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 component disk's
-.Xr disklabel 8
-and the concatenated disk's disklabel.
-The kernel wants to only allow component partitions of type
-.Dv FS_CCD ,
-but due to disklabel restrictions on some architectures will also accept
-component partitions of
-.Dv FS_BSDFFS .
-.Pp
-In order to compile in support for
-.Nm ,
-make sure your kernel configuration file contains a line
-similar to the following (GENERIC does by default):
-.Bd -literal -offset indent
-pseudo-device	ccd	4	# concatenated disk devices
-.Ed
-.Pp
-The optional
-.Ar count
-argument specifies how many
-concatenated disk devices are allocated for at boot time.
-In this example, no more than 4
-may be configured.
-.Pp
-A
-.Nm
-may be either serially concatenated, interleaved, or mirrored.
-To serially concatenate partitions, specify an interleave factor of 0.
-Mirroring configurations require an even number of components.
-.Pp
-If a
-.Nm
-is interleaved correctly, a
-.Dq striping
-effect is achieved, which can increase performance.
-Finding the optimum interleave factor is a hard problem.
-Some things to think about are the number of disks in the
-.Nm ,
-the typical read-ahead opportunities, the filesystem blocksize, and if
-it's possible to use the optimized
-.Nm
-I/O protocol.
-The optimized protocol allows smaller interleave factors for a
-comparably cheap price but requires that the factor be a multiple of the
-software page size
-.Pf ( Dv CLBYTES ) ,
-and that mirroring is not requested.
-So far the best policy is to test with different interleaves and
-benchmark typical uses.
-A rule of thumb might be to use the software pagesize with the optimized
-I/O protocol (the default, unless the requirements mentioned above are not
-fulfilled) or
-.Dv MAXBSIZE /
-#components with the unoptimized protocol.
-Since the interleave factor is expressed in units of
-.Dv DEV_BSIZE ,
-one must account for sector sizes other than
-.Dv 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
-.Dv DEV_BSIZE .
-.Pp
-Note that best performance is achieved if all component disks have the same
-geometry and size.
-Optimum striping cannot occur with different disk types.
-.Pp
-There is a run-time utility that is used for configuring concatenated disks.
-See
-.Xr ccdconfig 8
-for more information.
-.Sh FILES
-.Bl -tag -width tenletters+five -compact
-.It Pa /dev/{,r}ccd*
-ccd device special files
-.El
-.Sh SEE ALSO
-.Xr MAKEDEV 8 ,
-.Xr ccdconfig 8 ,
-.Xr disklabel 8 ,
-.Xr fsck 8 ,
-.Xr growfs 8 ,
-.Xr mount 8 ,
-.Xr newfs 8
-.Sh HISTORY
-The concatenated disk driver was originally written at the University of
-Utah.
-.Sh CAVEATS
-If just one (or more) of the disks in a
-non-redundant
-.Nm
-configuration fails, the entire file system will be lost.