1. RAID 2:
它由位级条带化组成。 RAID 2 使用汉明码奇偶校验记录纠错码 (ECC)。在这个级别中,字中的每个数据位都记录在单独的磁盘上,数据字的 ECC 代码存储在不同的磁盘集上。
优势 –
- 在纠错的情况下,它使用汉明码。
- 它使用一个指定的驱动器来存储奇偶校验。
坏处 –
- 由于额外的驱动,结构复杂,成本高。
- 它需要额外的驱动器来检测错误。
2. RAID 3:
RAID 3 由字节级条带化组成。它将数据条带化到多个磁盘上。为每个磁盘部分生成并存储在不同的专用磁盘上的奇偶校验位。这个级别克服了单盘故障。
好处 –
- 数据可以批量传输。
- 数据可以并行访问。
缺点——
- 它需要一个额外的驱动器来实现奇偶校验。
- 在小文件的情况下,它执行缓慢。
RAID 2 和 RAID 3 的区别:
SR.No. | RAID 2 | RAID 3 |
---|---|---|
1. | RAID 2 stands for Redundant Array of Independent Disk level 2. | RAID 3 stands for Redundant Array of Independent Disk level 3. |
2. | In RAID 2 technology, Bit-level Striping is used. | In RAID 3 technology, Byte-level Striping is used. |
3. | In this level, One group of disk are used to write the data and other group is used to write the ECC. | In this level, Multiple disks are used for storing data and one dedicated disk is used to store parity |
4. | Hamming code is used for Error detection. | Hamming code is not used. |
5. | It require extra drive for Error Code. | It require extra drive for Parity. |
6. | If one of the disk fails, the remaining bits of the byte and the associated ECC bits can be used to reconstruct the data. | In case of drive failure the parity bits is accessed and data is reconstructed from the remaining drive. |