To understand, the factors which affect the RAID can be understood by considering the various issues. For example, you have heard a common saying like "RAID improves hard disk reliability", but that is not a true statement. The truth depends to how you define reliability. This means that a reliability of the individual drives, or the whole system when you are talking about the data, or the hardware itself then off course, not all possible for RAID implementations improving reliability in any way. The reliability of an individual component refers to how likely the component is to remain working with a failure being encountered, typically measured over some period of time. The reliability of a component is a combination of factors: general factors related to the design and manufacture of the particular makes and model, and specific factors relevant to the way that particular component was built, shipped, installed and maintained. The reliability of a system can be defined as a function of the reliability of its components. The more components you put into a system, definitely system will get overloaded and finally it worsens the reliability of the system as a whole. That is the reason why machines uses break down more frequently than simple ones. In creating array reliability has decreased by 82%. And then people bother with RAID at all. That is the reasons of the other side of the reliability coin. The reliability of the array hardware goes down because of mirroring or parity. You can provide fault tolerance and the ability to withstand and recover from a failure which reduces the reliability of the array to allow failures to occur without the array or its data being disrupted, and that is the reason why RAID provides data protection. The RAID Reliability issues use the RAID in most of our businesses in the protection of critical data. The reason that most people say RAID improves reliability is that the term reliability are going to include the tolerance of RAID. They are not really talking about the reliability of the hardware instead they are talking about the software concerns. The people who talks about the enhanced reliability of RAID means that they really are referring to is the most RAID implementations. Most of the people thinks the Reliability and fault tolerance are not the same thing. Fault tolerance defines the ability of a RAID array to withstand the loss of some of its hardware. When any fault occurs in the application, the array enters into degraded state and the failed drive is replaced and rebuilt. The capability of an array to tolerate hard disk faults depends mainly on the RAID level implemented. RAID 0 has no redundant information, and has no fault tolerance if any drive fails the array goes down. RAID levels 1, 2, 3, 4, 5 and 7 can tolerate the loss of one hard disk; RAID 6 can tolerate the loss of two. The multiple RAID levels can tolerate the loss of multiple hard disks depending on which ones they are and how the array is configured.

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RAID 3
RAID 4
RAID 6
RAID Implementation
RAID Parity
Resizing RAID regions
Testing RAID Drives
General Concept - RAID
Single RAID level
RAID Parity Corruption
Multiple / Nested RAID level
Bunch of Hard Disks
Data Loss from RAID Servers
Serial ATA RAID
RAID Data Recovery
Comparision of RAID Levels
RAID Toolbox
SCSI RAID
RAID Performance
Storage Controllers - RAID
MAC- RAID Installation
RAID Technology
RAID Cost
Windows Server Installation

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