Parity drive
In today's world, Parity drive has acquired fundamental importance in different aspects of daily life. From its influence on the economy to its impact on society, Parity drive has become a topic of constant debate and analysis. In this article, we will explore in detail the importance of Parity drive and how it has evolved over time. From its appearance on the public scene to its impact in different areas, Parity drive is a phenomenon that deserves our full attention. Through detailed analysis, we will examine the different facets of Parity drive and its impact on today's world.
A parity drive is a hard drive used in a RAID array to provide fault tolerance. For example, RAID 3 uses a parity drive to create a system that is both fault tolerant and, because of data striping, fast. Basically, a single data bit is added to the end of a data block to ensure the number of bits in the message is either odd or even.
One way to implement a parity drive in a RAID array is to use the exclusive or, or XOR, function. XOR is a Boolean logic function which means 'one or the other, but not both'. The XOR of all of the data drives in the RAID array is written to the parity drive. If one of the data drives fails, the XOR of the remaining drives is identical to the data of the lost drive. Therefore, when a drive is lost, recovering the drive is as simple as copying the XOR of the remaining drives to a fresh data drive.
References
- ^ Definitions of RAID configurations Retrieved on 2010-11-15
- ^ "What does the parity bit do in RAID?". ComputerWeekly.com.
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