RAID 10 (also called RAID 1+0) is a storage configuration that combines mirroring (RAID 1) and striping (RAID 0) to provide both strong data protection and high performance. It requires a minimum of four disks, where data is first mirrored in pairs for redundancy and then striped across these mirrored pairs to improve read/write speeds.
Key points about RAID 10:
- Mirroring (RAID 1) duplicates data on two disks, so if one disk fails, the other still holds the data, ensuring fault tolerance.
- Striping (RAID 0) splits data across multiple disks, allowing simultaneous read/write operations, which boosts performance.
- RAID 10 can tolerate the failure of one disk in each mirrored pair without data loss, but if both disks in the same mirror fail, data is lost.
- It offers excellent fault tolerance and high throughput, making it ideal for mission-critical applications like databases, email servers, and web servers that require fast access and minimal downtime.
- The downside is that RAID 10 requires twice the storage capacity (due to mirroring), making it more expensive compared to simpler RAID levels.
In summary, RAID 10 is valued for its combination of speed and reliability, leveraging the safety of mirroring with the performance benefits of striping, suitable for environments demanding both high availability and fast data access.
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