1.\" Copyright (c) 2005 Christian Brueffer 2.\" All rights reserved. 3.\" 4.\" Redistribution and use in source and binary forms, with or without 5.\" modification, are permitted provided that the following conditions 6.\" are met: 7.\" 1. Redistributions of source code must retain the above copyright 8.\" notice, this list of conditions and the following disclaimer. 9.\" 2. Redistributions in binary form must reproduce the above copyright 10.\" notice, this list of conditions and the following disclaimer in the 11.\" documentation and/or other materials provided with the distribution. 12.\" 13.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 14.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 15.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 16.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 17.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 18.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 19.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 20.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 21.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 22.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 23.\" SUCH DAMAGE. 24.\" 25.\" $FreeBSD: src/share/man/man4/ataraid.4,v 1.10 2006/09/18 15:24:18 ru Exp $ 26.\" 27.Dd June 24, 2007 28.Dt NATARAID 4 29.Os 30.Sh NAME 31.Nm nataraid , 32.Nm ar 33.Nd "ATA software RAID support" 34.Sh SYNOPSIS 35.Cd "device nata" 36.Cd "device nataraid" 37.Sh DESCRIPTION 38The 39.Nm 40driver provides support for so-called software RAID 41(sometimes referred to as fake RAID or pseudo RAID). 42.Pp 43When a controller that supports software RAID is instructed to 44create a RAID array, its BIOS writes data structures in a specific 45metadata format to the disks. 46These data structures are picked up by the 47.Nm 48driver, so that 49.Dx 50can work with the array. 51The 52.Nm 53driver has to understand the specific metadata format of a 54controller BIOS in order to support its RAID capabilities. 55.Pp 56Read-only support for a metadata format means that 57.Dx 58can use the given RAID array for normal read/write operations. 59Creation and rebuild of such arrays has to be done from the 60controller BIOS. 61.Pp 62Read and write support for a metadata format means that 63.Dx 64can use the given RAID array for normal read/write operations. 65Additionally, the 66.Xr natacontrol 8 67utility can be used to create, rebuild, update and fail such 68RAID arrays. 69.Pp 70The 71.Nm 72driver can read the following metadata formats: 73.Pp 74.Bl -bullet -compact 75.It 76Adaptec HostRAID 77.It 78Highpoint V2 RocketRAID 79.It 80Highpoint V3 RocketRAID 81.It 82Intel MatrixRAID 83.It 84Integrated Technology Express (ITE) 85.It 86JMicron 87.It 88LSI Logic V2 MegaRAID 89.It 90LSI Logic V3 MegaRAID 91.It 92NVIDIA MediaShield 93.It 94Promise FastTrak 95.It 96Silicon Image Medley 97.It 98Silicon Integrated Systems (SiS) 99.It 100VIA Tech V-RAID 101.It 102FreeBSD PseudoRAID 103.El 104.Pp 105The 106.Nm 107driver can write the following metadata formats: 108.Pp 109.Bl -bullet -compact 110.It 111Highpoint V2 RocketRAID 112.It 113Intel MatrixRAID 114.It 115JMicron 116.It 117Promise FastTrak 118.It 119Silicon Integrated Systems (SiS) 120.It 121VIA Tech V-RAID 122.It 123FreeBSD PseudoRAID 124.El 125.Pp 126It is also possible to use software RAID on controllers 127that do not have special software RAID capabilities. 128See 129.Xr natacontrol 8 130for details. 131.Sh FILES 132.Bl -tag -width ".Pa /dev/ar*" -compact 133.It Pa /dev/ar* 134ATA RAID device nodes 135.El 136.Sh SEE ALSO 137.Xr nata 4 , 138.Xr natacontrol 8 139.Sh CAVEATS 140RAID5 is not supported at this time. 141Code exists, but it neither uses nor maintains parity information. 142.Sh AUTHORS 143.An -nosplit 144The 145.Nm 146driver was written by 147.An S\(/oren Schmidt Aq Mt sos@FreeBSD.org . 148This manual page was written by 149.An Christian Brueffer Aq Mt brueffer@FreeBSD.org . 150