137 lines
3.5 KiB
Groff
137 lines
3.5 KiB
Groff
.\" Copyright (c) 2005 Christian Brueffer
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.\" All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" $FreeBSD$
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.\"
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.Dd November 27, 2005
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.Dt ATARAID 4
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.Os
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.Sh NAME
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.Nm ataraid
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.Nd "ATA software RAID support"
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.Sh SYNOPSIS
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.Cd "device ata"
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.Cd "device ataraid"
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.Sh DESCRIPTION
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The
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.Nm
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driver provides support for so-called software RAID
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(sometimes referred to as fake RAID or pseudo RAID).
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.Pp
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When a controller that supports software RAID is instructed to
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create a RAID array, its BIOS writes data structures in a specific
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metadata format to the disks.
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These data structures are picked up by the
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.Nm
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driver, so that
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.Fx
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can work with the array.
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The
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.Nm
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driver has to understand the specific metadata format of a
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controller BIOS in order to support its RAID capabilities.
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.Pp
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Read-only support for a metadata format means that
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.Fx
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can use the given RAID array for normal read/write operations.
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Creation and rebuild of such arrays has to be done from the
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controller BIOS.
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.Pp
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Read and write support for a metadata format means that
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.Fx
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can use the given RAID array for normal read/write operations.
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Additionally, the
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.Xr atacontrol 8
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utility can be used to create, rebuild, update and fail such
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RAID arrays.
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.Pp
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The
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.Nm
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driver can read the following metadata formats:
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.Pp
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.Bl -bullet -compact
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.It
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Adaptec HostRAID
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.It
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Highpoint V2 RocketRAID
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.It
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Highpoint V3 RocketRAID
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.It
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Intel MatrixRAID
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.It
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Integrated Technology Express (ITE)
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.It
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LSI Logic V2 MegaRAID
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.It
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LSI Logic V3 MegaRAID
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.It
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NVIDIA MediaShield
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.It
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Promise FastTrak
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.It
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Silicon Image Medley
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.It
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VIA Tech V-RAID
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.It
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FreeBSD PseudoRAID
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.El
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.Pp
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The
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.Nm
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driver can write the following metadata formats:
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.Pp
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.Bl -bullet -compact
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.It
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Highpoint V2 RocketRAID
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.It
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Promise FastTrak
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.It
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FreeBSD PseudoRAID
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.El
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.Pp
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It is also possible to use software RAID on controllers
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that do not have special software RAID capabilities.
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See
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.Xr atacontrol 8
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for details.
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.Sh FILES
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.Bl -tag -width ".Pa /dev/ar*" -compact
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.It Pa /dev/ar*
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ATA RAID device nodes
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.El
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.Sh SEE ALSO
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.Xr ata 4 ,
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.Xr atacontrol 8
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.Sh CAVEATS
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RAID5 is not supported at this time.
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Code exists, but it neither uses nor maintains parity information.
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.Sh AUTHORS
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.An -nosplit
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The
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.Nm
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driver was written by
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.An S\(/oren Schmidt Aq sos@FreeBSD.org .
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This manual page was written by
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.An Christian Brueffer Aq brueffer@FreeBSD.org .
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