What is RAID ?
What is RAID?
RAID : is an acronym for Redundant Array of Independent Disks
Or a cumulative set of independent disks.
A technology used in storage systems to improve performance and reliability by grouping multiple hard drives into one set.
RAID works by distributing data and partitions across multiple disks, enabling fast speeds and data protection.
There are several different types of RAID technology, differing in the way data is organized and distributed across multiple disks.
* Here are the most popular types of RAID:
1️⃣RAID 0:
Used to increase reading and writing speed. Data across multiple disks is fragmented in parallel, resulting in increased read and write performance. However, there is no balance of performance and no predisk suspension; failure of any disk will result in the loss of all data.
2️⃣ RAID 1:
Used to provide reserve (mirror). Data is replicated across multiple disks, with the same data written to each disk. This provides an automatic backup, where data can be restored if any disk fails. However, storage capacity is used more frequently, as two disks are used to store the same data.
3️⃣ RAID 5:
Used to provide tolerance for errors and balance performance. Data is hashed and distributed across multiple disks, and excess information (parity) is calculated and stored on different disks. This redundant information allows a single disk failover, where data can be recovered from excess information and other disks. RAID 5 requires at least three disks.
4️⃣RAID 6:
RAID 5 is similar in error tolerance and performance balance, but it offers more protection. Excess information (parity) is stored on multiple disks, allowing the override of two failed disks in RAID 6. This means that data can be restored if two disks fail in the RAID 6 system. RAID 6 requires at least four disks.
RAID systems are very popular in storage and server environments, as they can be customized based on the performance and reliability needs of different applications. Before using RAID technology, you should take into account your requirements and the level of data protection you need.