RAID 10 architecture combines striping (RAID 0) and mirroring (RAID 1) by first creating mirrored pairs of disks and then striping data across these pairs. In this setup, data is split into blocks and striped across multiple RAID 1 mirrored pairs, so each pair contains an exact mirror of the striped data blocks.
Specifically, new data is divided into stripes and written across the mirrored pairs. Each RAID 1 pair stores the same data blocks, providing redundancy. If one disk in a mirrored pair fails, the other disk in that pair still holds the data, allowing the array to remain operational without data loss. However, if both disks in the same mirrored pair fail, the RAID 10 array fails. This architecture requires a minimum of four disks (two mirrored pairs) to implement.
This combination offers the high performance of striping (fast read/write speeds due to parallel access) and the fault tolerance of mirroring (data redundancy). RAID 10 is well-suited for environments requiring both speed and reliability, such as database servers and mission-critical applications. The trade-off is that half of the total storage capacity is used for mirroring, making it more costly compared to other RAID levels.
In summary:
| Aspect | Description |
|---|---|
| Minimum disks | 4 (two RAID 1 mirrored pairs) |
| Data layout | Data striped across mirrored pairs (striping of mirrors) |
| Fault tolerance | Can tolerate multiple disk failures as long as both disks in the same mirrored pair do not fail |
| Performance | High read/write speeds due to striping |
| Storage efficiency | 50% (half of total disk space used for mirroring) |
| Use cases | High-performance, fault-tolerant systems (e.g., databases, email servers) |
This architecture balances speed and redundancy by striping data across mirrored disk pairs, ensuring both fast access and data protection.
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