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ATARAID(4)		 BSD Kernel Interfaces Manual		    ATARAID(4)

NAME
     ataraid --	ATA software RAID support

SYNOPSIS
     device ata
     device ataraid

DESCRIPTION
     The ataraid driver	provides support for so-called software	RAID (some-
     times referred to as fake RAID or pseudo RAID).

     When a controller that supports software RAID is instructed to create a
     RAID array, its BIOS writes data structures in a specific metadata	format
     to	the disks.  These data structures are picked up	by the ataraid driver,
     so	that FreeBSD can work with the array.  The ataraid driver has to un-
     derstand the specific metadata format of a	controller BIOS	in order to
     support its RAID capabilities.

     Read-only support for a metadata format means that	FreeBSD	can use	the
     given RAID	array for normal read/write operations.	 Creation and rebuild
     of	such arrays has	to be done from	the controller BIOS.

     Read and write support for	a metadata format means	that FreeBSD can use
     the given RAID array for normal read/write	operations.  Additionally, the
     atacontrol(8) utility can be used to create, rebuild, update and fail
     such RAID arrays.

     The ataraid driver	can read the following metadata	formats:

     +o	 Adaptec HostRAID
     +o	 Highpoint V2 RocketRAID
     +o	 Highpoint V3 RocketRAID
     +o	 Intel MatrixRAID
     +o	 Integrated Technology Express (ITE)
     +o	 JMicron
     +o	 LSI Logic V2 MegaRAID
     +o	 LSI Logic V3 MegaRAID
     +o	 NVIDIA	MediaShield
     +o	 Promise FastTrak
     +o	 Silicon Image Medley
     +o	 Silicon Integrated Systems (SiS)
     +o	 VIA Tech V-RAID
     +o	 FreeBSD PseudoRAID

     The ataraid driver	can write the following	metadata formats:

     +o	 Highpoint V2 RocketRAID
     +o	 Intel MatrixRAID
     +o	 JMicron
     +o	 Promise FastTrak
     +o	 Silicon Integrated Systems (SiS)
     +o	 VIA Tech V-RAID
     +o	 FreeBSD PseudoRAID

     It	is also	possible to use	software RAID on controllers that do not have
     special software RAID capabilities.  See atacontrol(8) for	details.

FILES
     /dev/ar*  ATA RAID	device nodes

SEE ALSO
     ata(4), atacontrol(8)

AUTHORS
     The ataraid driver	was written by Soren Schmidt <sos@FreeBSD.org>.	 This
     manual page was written by	Christian Brueffer <brueffer@FreeBSD.org>.

CAVEATS
     RAID5 is not supported at this time.  Code	exists,	but it neither uses
     nor maintains parity information.

BSD			       February	17, 2006			   BSD

NAME | SYNOPSIS | DESCRIPTION | FILES | SEE ALSO | AUTHORS | CAVEATS

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