What is RAID-1
RAID-1 (Redundant Array of Independent Disks – Level 1) is one of the popular RAID configurations in data storage systems.
RAID-1 operates by synchronously copying data between two hard drives or storage devices. Each time data is written to one drive, it is also written to the other drive, creating a complete and synchronous duplicate. This ensures that if one drive fails, the data remains safe on the other drive.
Requirements:
- Two hard drives or storage devices with equal capacity.
- Hardware or software support for RAID-1.
Advantages:
- Data Protection: Data is copied in parallel, protecting it from loss due to hardware failure.
- Reliability: RAID-1 provides high reliability with the ability to recover data if one drive fails.
- Good Read Performance: Improves read performance by allowing reading from both drives simultaneously.
- Easy Data Recovery: When one drive fails, data can still be easily recovered from the remaining drive.
Disadvantages:
- Cost: RAID-1 requires at least two drives, increasing costs compared to using a single drive.
- Limited Write Performance: Write performance may be reduced as all data must be written simultaneously to both drives.
- No Increase in Storage Capacity: The storage capacity used in RAID-1 is only equivalent to that of a single drive because data is copied synchronously.
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