Introduction to RAID

Raid Types and Configurations

RAID 0:
- Data is evenly split across multiple disks
- Minimum drives: 2
- Fast but no redundancy
RAID 1:
- Data is written the exact to two or more drives making sure than an copy of the original data is kept.
- Minimum drives: 2
- Fast as reading but can be slow when writing, can survive a single drive failure.
RAID 5:
- Data is put across multiple discs with parity information which allows for drives to be rebuilt if one fails.
- Minimum drives: 3
- Good read speed and redundancy but write is slower.
- High reliability
RAID 6:
- Has another parity block for additional reliability and to recover from two drive failures at once.
- Minimum drives: 4
RAID 10:
- Combines both RAID 0 and RAID 1

RAID 0: High speed, without redundancy
- Video editing and to store large media files, has no data recovery if failure.
RAID 1: Maximum redundancy for critical data
- Good for data critical scenarios like hospitals and governmental places.
RAID 5: Cost affective with redundancy and performance
- Companies who want to maximise storage and have reliability.
RAID 6: Extra protection for RAID 5
- Companies who want to have extra protection against drive failure.
RAID 10: High-Performance Redundancy
- Good for data centres who want fast performance and to be able to recover from drive failures without downtime.