RAID 1 (Mirroring) offers key benefits for data safety by duplicating data exactly on two or more drives, providing high fault tolerance and data redundancy. If one drive fails, the system continues operating without data loss because the other drive has an identical copy.
Benefits of RAID 1:
- Data Redundancy and Fault Tolerance: Each piece of data is written to multiple drives, ensuring availability even if one drive fails.
- Improved Read Performance: Read operations can be faster since data can be read from any mirrored drive, allowing load distribution.
- Simple Configuration: RAID 1 is easy to set up and manage, making it suitable for small to medium datasets and critical data storage.
- Predictable Rebuilds: Resynchronization after a drive failure is straightforward and reliable.
Limitations of RAID 1:
- Storage Efficiency: RAID 1 uses 50% of total disk capacity for mirroring, so usable storage is halved (e.g., two 1 TB drives yield 1 TB usable space).
- Slower Write Performance: Write speed is slower because data must be written to all mirrored drives simultaneously.
- Not a Complete Backup Solution: RAID 1 does not protect against data corruption, power surges, or physical damage; corrupted data is mirrored exactly.
- Cost: Requires twice the number of drives, increasing hardware costs.
- Limited Scalability: Not ideal for very large data sets or write-intensive applications; alternatives like RAID 10 or parity-based RAID may be better for those scenarios.
- SSD Considerations: Mirroring SSDs may not improve data safety significantly because identical SSDs of the same age may fail simultaneously.
RAID 1 is best suited for environments where data integrity and availability are critical, such as financial records or small to medium servers, but it should be combined with other backup methods for comprehensive data protection.
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