Motherboard RAID Support dmraid

Advance Technical Repair of Laptops Motherboard

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With kernel 2.6, hardware RAID devices are supported with the Device-Mapper Software RAID support tool (dmraid), which currently supports a wide range of motherboard RAID devices. Keep in mind that many "hardware" RAID devices are, in effect, really software RAID (fakeraid). Though you configure them in the motherboard BIOS, the drivers operate as software, like any other drivers. In this respect, they could be considered less flexible than a Linux software RAID solution, and they could also depend directly on vendor support for any fixes for updates.

The dmraid driver will map your system to hardware RAID devices such as those provided by Intel, Promise, and Silicon Magic and often included on motherboards.

The dmraid tool uses the device-mapper driver to set up a virtual file system interface, just as is done for LVM drives. The RAID device names will be located in /dev/mapper.

You use the BIOS RAID configuration utility to set up RAID devices as instructed by the hardware documentation. During a Linux installation, the RAID devices are automatically detected and the dmraid module is loaded, selecting the appropriate drivers.

Using the dmraid command, you can detect and activate RAID devices. The following command displays your RAID devices:

dmraid -r

To list currently supported devices, use dmraid with the -l option:

dmraid -l

Note The dmraid tool is improved continually and may not work well with some RAID devices.

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