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不同于RAID2, RAID3使用单块磁盘存放奇偶校验信息。 如果一块磁盘失效, 奇偶盘及其他数据盘可以重新产生数据。 如果奇偶盘失效,则不影响数据使用。RAID3对于大量的连续数据可提供很好的传输率, 但对于随机数据, 奇偶盘会成为写操作的瓶颈。

RAID3: Parallel transfer with parity

Characteristics/Advantages

1. Very high Read data transfer rate

2. Very high Write data transfer rate

3. Disk failure has an insignificant impact on throughput

4. Low ratio of ECC (Parity) disks to data disks means high efficiency

Disadvantages

1. Transaction rate equal to that of a single disk drive at best (if spindles are synchronized)

2. Controller design is fairly complex

3. Very difficult and resource intensive to do as a “software” RAID

Recommended Applications

1. Video Production and live streaming

2. Image Editing

3. Video Editing

4. Prepress Applications

5. Any application requiring high throughput

The data block is subdivided (”striped”) and written on the data disks. Stripe parity is generated on Writes, recorded on the parity disk and checked on Reads.

RAID Level 3 requires a minimum of 3 drives to implement