![]() ![]() Instead they rely on non-linux software to perform the rebuild. However, be aware that not all BIOS RAID implementations support drive rebuilding. dmraid is comparable to mdadm (pure Linux software RAID) with the added benefit of being able to completely rebuild a drive after a failure before the system is ever booted. See also FakeRaidHowto Community Ubuntu Documentation for more information.ĭespite the terminology, "fake RAID" via dmraid is a robust software RAID implementation that offers a solid system to mirror or stripe data across multiple disks with negligible overhead for any modern system. Before their introduction, a "RAID controller" implied that the controller did the processing, and the new type has become known in technically knowledgeable circles as "fake RAID" even though the RAID itself is implemented correctly. SATA for Intel Matrix RAID, as there is neither SCSI nor PATA support in modern Intel ICH southbridges however, motherboard makers implement RAID controllers outside of the southbridge on some motherboards). Firmware controllers often can only use certain types of hard drives in their RAID arrays (e.g. These controllers are described by their manufacturers as RAID controllers, and it is rarely made clear to purchasers that the burden of RAID processing is borne by the host computer's central processing unit - not the RAID controller itself - thus introducing the aforementioned CPU overhead which hardware controllers do not suffer from. When a protected-mode operating system kernel such as Linux or a modern version of Microsoft Windows is loaded, the drivers take over. During early stage boot-up, the RAID is implemented by the firmware. ![]() To fill this gap, cheap "RAID controllers" were introduced that do not contain a RAID controller chip, but simply a standard disk controller chip with special firmware and drivers. Hardware RAID controllers are expensive and proprietary. Operating system-based RAID doesn't always protect the boot process and is generally impractical on desktop versions of Windows. When using so-called "fake RAID" or "host RAID", the disc sets are reached from /dev/mapper/chipsetName_randomName and not /dev/sd X. The purpose of this guide is to enable use of a RAID set created by the on-board BIOS RAID controller and thereby allow dual-booting of Linux and Windows from partitions inside the RAID set using GRUB. ![]()
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