What is RAID 5?
RAID 5 - Block-level data striping with distributed parity. A Good Compromise
RAID 5 stripes data across multiple disks. RAID 5, however, adds a parity check bit to the data. This slightly reduces available disk capacity, but it also means that the RAID array continues to function if a single disk fails. In the event of a disk failure, you simply replace the failed disk and keep going.
The tradeoffs with RAID 5 are a small performance penalty in write operations and a slight decrease in usabable storage space.
- Minimum number of drives: 3
- Strengths: Best cost/performance for transaction-oriented networks; Very high performance, very high data protection; Supports multiple simultaneous reads and writes; Can also be optimized for large, sequential requests.
- Weaknesses: Write performance is slower than RAID 0 or RAID 1.
|DRIVE 1||DRIVE 2||DRIVE 3|
|Parity A||Data A||Data A|
|Data B||Parity B||Data B|
|Data C||Data C||Parity C|