RAID (Redundant Array of Independent Disks) is a type of storage that comprises of several individual small disks that integrate to form a large single storage of a bigger size. It is cost-effective and highly reliable. RAID assures of fault tolerance. It is designed to perform continuously without interruptions even if one or more of the hard disk drives is non-functional or down for maintenance. However, outages can happen, and this applies to RAID too. When it occurs, it can create several issues like loss of data, a malware attack, or system corruption or something similar.Â
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RAID storage methods:
1. Striping: RAID splits the flow of information into blocks maintaining uniformity in size. It then writes the block across the RAID individuallyÂ
2. Mirroring: Data is copied and stored in the RAID array concurrently.Â
3. Parity: It utilizes the striping technique. If a drive fails, the lost block is recalculated from the checksum and replaced.Â
RAID 0 – Is built on striping. However, it doesn't provide fault tolerance but intensifies the read and write speed.
RAID 1 - uses mirroring technique, surges the read speed in some cases, and offers fault tolerance if one disk in the array fails.
RAID 5 – blocks are in Interweaved distributed parity. Data striping is done at byte level and strip error correction. Offers high performance and efficient fault tolerance.
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RAID 10 – Same as RAID 5 but improves on it with two different parity functions. It can be used for both replications as well as sharing of data among disks.Â
RAID can be built by both software and hardware. Software RAID uses the operating system drives. The CPU load can increase anything between 1 to 5 percent when implementing parity technique. Â
The hardware system can be external device or a special RAID chip can be built into the motherboard.Â
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