Why is there no RAID 2?
The main reason RAID 2 is not used is that it offers little advantage over simpler parity schemes, such as RAID 3 and RAID 5, due to the implementation of internal error correction in modern hard disk drives, making the complexity of an external Hamming code unnecessary. The RAID 2 configuration, which uses bit-level striping with dedicated Hamming-code parity, is overly complex and inefficient, requiring many disks for each bit of data, and is therefore no longer used in modern systems.
Introduction to RAID 2
What is RAID 2?
RAID 2 is a Redundant Array of Independent Disks configuration that uses bit-level striping with dedicated Hamming-code parity, where all disk spindle rotation is synchronized and data is striped such that each sequential bit is on a different drive.
Frequently Asked Questions
1. What is the point of RAID 2?
RAID 2 uses striping across disks, with some disks storing error checking and correcting (ECC) information, and also uses a dedicated Hamming code parity, a linear form of ECC.
2. Why is RAID 2 not used?
RAID 2 has no advantage over RAID 3 and is no longer used due to its complexity and inefficiency.
3. Is there a RAID 2 and 3?
Yes, RAID 3 is a configuration that uses a parity disk to store the information generated by a RAID controller instead of striping it with the data.
4. What are the disadvantages of RAID 2?
The disadvantages of RAID 2 include being commercially unviable, inefficient, and having a high entry-level cost, requiring a very high transfer data rate to justify the high ratio of ECC disks to data disks.
5. Why is RAID 3 not used?
RAID 3 is not used because it does not perform well when tasked with numerous small data requests, as the parity information is on a separate disk.
6. Why is RAID 0 risky?
RAID 0 is risky because it has absolutely no redundancy, and if one drive fails, all the data on the array is lost.
7. Does RAID 2 exist?
Yes, RAID 2 exists, but it is no longer used due to its complexity and inefficiency.
8. Is The Raid 2 as good as the raid?
The film The Raid 2 is a sequel to The Raid and has a more complex crime family plot and even wilder action, but its pacing is a bit slower than the original.
9. How violent is The Raid 2?
The Raid 2 is filled with incredibly strong martial arts violence and fighting.
10. Why should RAID 5 no longer be used?
RAID 5 should no longer be used because it has longer rebuild times, which could result in data loss, and if another disk fails during the rebuild, then users lose data forever.
11. Why is RAID 5 better than RAID 3?
RAID 5 is better than RAID 3 because it distributes parity data throughout each disk, whereas RAID 3 stores parity data on a single disk.
12. Why not use RAID 6?
RAID 6 arrays are even slower than RAID 5 arrays because they store a greater volume of parity data.
13. Does RAID 2 have redundancy?
Yes, RAID 2 has redundancy, as it uses a dedicated Hamming code parity and requires an extra drive for error correction.
14. Why is the raid 2 rated R?
The Raid 2 was given an R rating by the MPAA for strong bloody violence throughout, sexuality, and language.
15. Will The Raid 3 ever happen?
The Raid 3 was initially planned as part of a trilogy, but it ultimately never happened due to a combination of factors, including the director’s change in plans and the challenges of creating a worthy sequel.