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ataraid (4)

>> ataraid (4) ( FreeBSD man: Специальные файлы /dev/* )

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NAME



ataraid

 - ATA software RAID support

SYNOPSIS

device ata device ataraid

DESCRIPTION

The driver provides support for so-called software RAID (sometimes 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 driver, so that Fx can work with the array. The driver has to understand the specific metadata format of a controller BIOS in order to support its RAID capabilities.

Read-only support for a metadata format means that Fx 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 Fx 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 driver can read the following metadata formats:

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

The driver can write the following metadata formats:

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

CAVEATS

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

AUTHORS

An -nosplit The driver was written by An S/oren Schmidt Aq [email protected] . This manual page was written by An Christian Brueffer Aq [email protected] .

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