Introduction to Raid 5 Arrays

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Definition of a Raid 5 Array

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This array level uses at least three disks and stripes information at the byte level over the member disks. Parity data is also written over each member disk to allow the array data to be recovered in the event of a disk failure.

Different Ways a Raid 5 Array Can Be Set Up

A Raid 5 array can be set up as a software Raid using special software or as a hardware Raid using a Raid controller.

A software Raid is generally either set up using standalone software or using Raid software which is built into an operating theory such as Windows 2003 Server. A software Raid uses the Cpu and memory of the computer on which it is installed. This can slow down other applications on that computer. This also makes the software Raid vulnerable to failure due to problems with the host computer. A hardware Raid uses a Raid controller which handles array duties thus there is no strain on the host computer's Cpu and memory.

Applications Best remarkable for Raid 5

Since Raid 5 offers great read carrying out than write performance, it is best remarkable for read-oriented applications such as web, intranet, and email servers. It could also be remarkable for databases as long as there is more reading than writing. With Raid 5, writes are slowed down because the array must write parity data to the disks.

Advantages and Disadvantages of Raid 5 Arrays

There are several advantages from a Raid 5 array. Since a Raid 5 writes parity data to each of the member disks, a Raid 5 can maintain the failure of one disk. The parity data allows the Raid to be recovered. an additional one benefit of Raid 5 is that it is fairly cost-effective inspecting the whole of fault tolerance it provides. Finally, Raid 5 offers a good rate of reads to the member disks. Some disadvantages of Raid 5 are that it offers slower writes as it must write parity data in increasing to regular data. It can also be expensive to implement as it requires special hardware.

Conclusion

Overall, Raid 5 offers excellent fault tolerance without wasting drive space. It also offers a high read carrying out production it suitable for a wide collection of applications. More information about Raid 5 arrays can be found at Raid 5 Recovery.

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