RAID 10 (also called RAID 1+0) is a storage configuration that combines mirroring (RAID 1) and striping (RAID 0) to deliver both high data redundancy and improved speed. It requires a minimum of four drives, where data is first mirrored in pairs for redundancy and then striped across those mirrored pairs for performance.
Key features of RAID 10 include:
- Data Redundancy: Each piece of data is stored on two drives (mirroring), so if one drive fails, the data remains safe on its mirror.
- Improved Performance: Striping spreads data across multiple mirrored pairs, allowing simultaneous read/write operations on different drives, which boosts speed significantly compared to single-drive setups.
- Fault Tolerance: RAID 10 can tolerate the failure of one drive in each mirrored pair without data loss. However, if both drives in the same mirrored pair fail, data is lost.
- Storage Efficiency: Only 50% of the total raw disk capacity is usable because the other 50% is used for the mirrored copies.
- Faster Rebuilds: In case of a drive failure, RAID 10 rebuilds by copying data from the surviving mirror, which is faster and less risky than parity-based RAID rebuilds like RAID 5 or 6.
RAID 10 is ideal for environments requiring high performance and strong data protection, such as critical databases and high-transaction systems. The trade-offs are higher cost due to the number of drives needed and reduced usable storage capacity.
In summary, RAID 10 effectively combines the speed benefits of striping with the data safety of mirroring, making it a popular choice for applications demanding both speed and redundancy.
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