RAID level 0
- Actually not use RAID redundancy does not improve in performance.
- Data distributed on the entire disk array, is the advantage of using a large capacity disk.
- 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.
- Mechanism for the transfer of data in one sector at a time so that only good for handling large data transfers.
RAID level 1
- Redundancy obtained by duplicate all the data on the disk mirror.
- As with RAID - 0, RAID - 1 stripping also use the technology.
- 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.
- RAID - 1 expensive.
- RAID - 1 increase in performance approximately doubled compared to RAID - 0 in the operation read, but not to write operations significantly increased.
- Matches are used to handle data that is often experienced failure in the process of reading.
- RAID - 1 still working on sector-sector.
- 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
- 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.
- Technology used in the stripping this level, only strip small size, often in word or byte size.
- Use a system error correction bits parity with the Hamming code.
RAID level 3
- Organized similar with RAID - 2.
- The difference in RAID - 3 requires only a single disk redudant, does not depend on the number of arrays disk.
- Computing parity bit for each word and write data on disk pritas special.
- When the drive failure occurs, the data re-arranged the rest of the data is still good and from information paritasnya.
- Using pararel access to the data distributed in the form of small strip-strip.
- Performing high-yield transfer, but can only executing a request.
- I / O, so only if used in high data transaction environment decline in performance.
RAID level 4
- Using techniques that independent access to every request so that disknya read or write served in pararel.
- RAID is suitable to deal with the culture system data transfer rates.
- No need synchronization because each disk operate independently.
- Stripping the data in a large size.
- Strip parity bits-per-bit is calculated to strip all the related data on each disk.
- Parity stored on disk for parity.
- When the writing operation, array management software not only to update the data but also related to parity.
- 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
- Having a similarity with RAID - 4 in the organization.
- The difference is strip-strip parity distributed across the entire disk.
- For security reasons, the strip parity disk is stored on a disk other.
- RAID - 5 improvement from the RAID - 4 in terms of improving performance.
- Disk is usually used in the network server.
RAID level 6
- It is the latest RAID technology.
- Using the method of calculating parity for two reasons to anticipate the accuracy and error correction.
- As with RAID - 5, parity stored on the disk other.
- Have a high transfer speeds.
0 comments:
Post a Comment