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The technology used in the RAID 5 is that of the disk stripping in combination along with the parity. The concept of parity and the method of calculating the parity are similar to the one in the RAID 3 and RAID 4 with a slight modification that differs much in the results. The data is stripped across the three disks (there may be more or less; but for consideration example let us just consider the three). The data is stripped across all the disk drive of the RAID server and the information regarding the parity is stored differing from the RAID 3 or RAID 4.
The data A is stored for example in the first disk drive. The data B is stored in the second disk drive. Now as in the case of the RAID 3 or RAID 4 the data the data C is not stored again on the first disk drive. But instead of this the data C is stored in the third disk drive. Here occurs the major difference in comparison with the RAID 3 and RAID 4.
Now again the data D is stored in the first disk drive and the data E in the second disk drive but the data F is stored in the third disk drive. In the case of the RAID 3 and the RAID 4 the data is stored in the two drives only and the parity is stored completely in an altogether different disk drive. But the case with the RAID 5 involves the parity to be mixed up along the data storage disk drives. The parity A+B is now stored in the third drive where only the data c and data F resides.
The parity C+D is stored in the second drive where only the data B and data E is in storage. The parity E+F is stored in the first disk drive where in only the data A and the data D is stored. Hence the data distribution and the data stripping are done this way. Along with this the parity is stored in the above explained way in all the disk drives along with the combination of the data.
The description is that regarding the RAID 5 the data sectors are distributed across all the disk drives. Similarly the data distribution is carried out according to the lines of the disk stripping as explained in the above mentioned general example. The information that is redundant is interspersed with that of the data that the user utilizes for him. In short the redundant information is interspersed with the user data. The reliability of the data is much higher that that involved in the single disk. But the data reliability can be considered to be in parallel with the RAID 2, RAID 3, and the RAID 4.
The data transfer speed for the RAID 5 in the read operation is similar to the disk stripping. The disk stripping method is different in this specific case. But the speed of the data transfer is lower for the write operation in the RAID 5 as in comparison with the single disk drive. The speed of the I/O (Input Output) operation for the RAID 5 for Read is that similar to the speed in disk stripping. But in the case for the write operation in the RAID 5 the speed of the data transfer for the Input Output operation is usually lower than the speed of Input Output operation for the single disk drive. Usually the data is stripped across the multiple drives and for the fault tolerance the concept of the parity bits is used.
The RAID is most widely used for the servers to provide the fault tolerance. In RAID 5 the most important thing to be noticed is that the parity is stored on the third disk and is interspersed along with the user data. The RAID 5 achieves a good performance between the performance in terms of the speed and also in terms of the availability.
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