RAID Types
Over time, 3 distinctive types of RAID technology have been developed and agreed upon, voluntarily, by various manufacturers and engineers.
Software RAID
In software RAID, the operation of the RAID drives handled by a layer of software between the hardware and the operating system. As it is software-based, the CPU handles the job of processing the RAID commands.
Advantages |
• This is the least expensive option because it requires no additional hardware. |
Disadvantages |
• The major drawback is that this method is based on the layer of abstraction between the hardware devices that make up the RAID volume and the operating system. For various reasons, this layer can be imperfect and miss some important functions such as detection and diagnosis of defects in materials and / or the assumption of spare storage units. |
Fake Hardware RAID
This forms the majority of RAID controllers that are integrated into motherboards. They often allow for RAID 0 and 1 support with IDE or SATA hard drives. If you ignore the marketing jargon, these are not hardware RAID controllers but rather SATA / IDE disk controllers with a few advanced RAID features added to them. From a strictly hardware point of view, this hybrid solution is not very different from software RAID. It only differs in the location of RAID management software.
Advantages |
• Its biggest advantage lies in its ability to store the operating system within the RAID array. Eecause it is BIOS-based, it allows the RAID software to be loaded before the operating system boots up. |
Disadvantages |
• It has the same performance as that of software RAID because it is actually RAID software integrated within the SATA/IDE controller. |
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