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Need information on RAID

Hardware Peripherals


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  #1  
Old 25-11-2009
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Need information on RAID
  

Hi,
I need a complete description about RAID partition technology. Today I have seen a laptop which charges more if I go for a further level of RAID partitions. There are multiple levels available in this thing. Which is best to go with the usual 0 or 1 or further. Which is the best among them and which is of no worth. I prefer data security in this part. Thanks in advance.

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  #2  
Old 25-11-2009
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Re: Need information on RAID

The RAID stands for Redundant Array of Inexpensive Disks, is a technology used in hard drives. Depending on the RAID used, one may wish to focus on reading, writing, or data backup. Having drives in RAID does not exempt us from making backups, disk crashes are more frequent than previously thought. Furthermore, a RAID system implements more records (2 minimum, no maximum), making the likelihood of a crash or multiple drives higher for a given machine.
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  #3  
Old 25-11-2009
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Re: Need information on RAID

There is series of RAID partition which defines the terms of use and requirement. Like the first one RAID 0 (stripping). This accelerates time to write data. The level of security provided by it is 0. Each byte is divided into so many fragments that are hard. Then comes RAID 1 (mirroring). This lowdown in writing but provides high security. In RAID 1, all information is duplicated on each disk. The writing time is increased somewhat, but the reliability is greatly increased, since on N disks, it only takes one to retrieve all the data. However, solution is very intensive hard drive.
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  #4  
Old 25-11-2009
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Re: Need information on RAID

RAID 2 gives out disappointing performance. The security is also not good enough. RAID 2 is based on the RAID 0 friends is to store additional information based on the Hamming code data. This technology is obsolete since the Hamming code is integrated directly into hard drives for some time now. RAID 3 has a relatively high security. RAID 4 is identical to RAID 3 except that it works in blocks of data rather than by bytes. It suffers the same problem as RAID 3, namely excessive solicitation of parity disk.
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  #5  
Old 26-11-2009
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Re: Need information on RAID

There are many options available in RAID. It depends on your need. Like RAID 5 gives good security but this is a technology using both the stripping and the use of a bit of parity blocks, and therefore resembles much of RAID 4. In the same way RAID 5 allows to have very close performance of RAID 0, while having a level of security greatly improved. Then comes RAID 6 which is same as RAID 5 but using 2 parity calculations, thus losing 2 disks instead of one in the case of RAID 5. RAID 7 is exactly the same as RAID 3, but with asynchronous writes. Difficult to implement, it is mostly a proprietary solution.
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