RAID

RAID level 0

1. Actually not use RAID redundancy does not improve in performance.
2. Data distributed on the entire disk array, is the advantage of using a large capacity disk.
3. RAID - 0 become a model of the data strip on the disk with a data management system specific to the data stored on considered a logical disk.
4. Mechanism for the transfer of data in one sector at a time so that only good for handling large data transfers.
   

RAID level 1

1. Redundancy obtained by duplicate all the data on the disk mirror.
2. As with RAID - 0, RAID - 1 stripping also use the technology.
3. The difference is in level 1 each strip mapped to the logic of the two disks that are logically separate so that each disk arrays will have a mirror disk that contains the same data.
4. RAID - 1 expensive.
5. RAID - 1 increase in performance approximately doubled compared to RAID - 0 in the operation read, but not to write operations significantly increased.
6. Matches are used to handle data that is often experienced failure in the process of reading.
7. RAID - 1 still working on sector-sector.
8. Benefits of RAID - 1:

• Request reading can be served by one of the disk because there are two disks contain the same data, depending on access to the fastest time.
• Demand for storage or writing is done on 2 disks in pararel.
• There are beack-up data, namely the disk in the mirror.
  

RAID level 2

1. RAID - 2 using the technique pararel access to all the disk. - All participating disk and executing every request so that there are mechanisms for synchronization and disk rotation head.
2. Technology used in the stripping this level, only strip small size, often in word or byte size.
3. Use a system error correction bits parity with the Hamming code.
   

RAID level 3

1. Organized similar with RAID - 2.
2. The difference in RAID - 3 requires only a single disk redudant, does not depend on the number of arrays disk.
3. Computing parity bit for each word and write data on disk pritas special.
4. When the drive failure occurs, the data re-arranged the rest of the data is still good and from information paritasnya.
5. Using pararel access to the data distributed in the form of small strip-strip.
6. Performing high-yield transfer, but can only executing a request.
7. I / O, so only if used in high data transaction environment decline in performance.
   

RAID level 4

1. Using techniques that independent access to every request so that disknya read or write served in pararel.
2. RAID is suitable to deal with the culture system data transfer rates.
3. No need synchronization because each disk operate independently.
4. Stripping the data in a large size.
5. Strip parity bits-per-bit is calculated to strip all the related data on each disk.
6. Parity stored on disk for parity.
7. When the writing operation, array management software not only to update the data but also related to parity.
8. Benefits of parity with the disk that has made special security data more secure, but with a separate disk parity will slow performance.
   

RAID level 5

1. Having a similarity with RAID - 4 in the organization.
2. The difference is strip-strip parity distributed across the entire disk.
3. For security reasons, the strip parity disk is stored on a disk other.
4. RAID - 5 improvement from the RAID - 4 in terms of improving performance.
5. Disk is usually used in the network server.
   

RAID level 6

1. It is the latest RAID technology.
2. Using the method of calculating parity for two reasons to anticipate the accuracy and error correction.
3. As with RAID - 5, parity stored on the disk other.
4. Have a high transfer speeds.

RAID Images