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A RAID (Redundant Array of Independent Disks) is a method of combining multiple hard drives into one logical volume for data storage. RAID technology is widely used in servers and offers various benefits, including reliability, performance, and data protection.
There are different RAID levels, each offering unique combinations of performance, data protection, and capacity. Here are some of the most common RAID levels:
- RAID 0: distributes data across two or more disks for enhanced performance and capacity, but offers no data protection or fault tolerance.
- RAID 1: uses two disks for mirroring, which means data on one disk is copied to the other disk for maximum data protection.
- RAID 5: distributes data across three or more disks with data redundancy used to protect data in case of disk failures.
- RAID 6: similar to RAID 5, but offers extra data redundancy using two parity blocks to provide data protection in case of two disk failures.
How does RAID work in a server?
When a RAID array is created, the physical disks are combined into one logical volume. The data is then distributed across the disks based on the chosen RAID level. Depending on the RAID level, the data can be duplicated and/or encoded to be protected against disk failures.
One significant advantage of RAID technology is that it offers protection against data loss in case of disk failure. When a disk fails, the RAID array can still function and provide access to the data by restoring it from the remaining disks.
RAID technology is a critical component of a server environment and offers better performance, availability, and data protection. Companies should evaluate their storage needs and budget to determine which RAID level best fits their business needs.
We hope this article has provided a useful introduction to RAID and why it's important for your server.