-
Anonymous users2024-02-06Redundant arrays of independent disks (RAID) means "redundant arrays with redundancy capabilities composed of independent disks".
The disk array is composed of many cheaper disks combined into a huge capacity disk group, and the additional effect generated by the data provided by individual disks improves the performance of the entire disk system. Using this technology, the data is sliced into many segments and stored on separate hard drives.
Disk arrays can also use the concept of parity check, which can still read data in the event of a failure of any hard disk in the array, and when the data is reconstructed, the data will be calculated and re-placed into a new hard drive.
The article published by the University of California-Berkeley in 1988: "A case for redundant arrays of inexpensive disks". In the article, the term RAID is talked about, and the 5 levels of RAID are defined.
The purpose of the Berkeley study was to reflect the fast performance of CPUs at the time. CPU performance grows by about 30 to 50% per year, while hard magnet machines can only grow by about 7%. The research team hopes to find a new technology that can immediately improve the performance of computers to balance the computing power in the short term.
At the time, Berkeley's research focused on efficiency versus cost.
In addition, the research team also designed fault-tolerance, logical data redundancy, and RAID theory. In the early days of the research, the main focus was on inexpensive disks, but it was later discovered that a large number of cheap disk combinations did not work in a real-world production environment, and later inexpensive was changed to independent, many independent disk groups.
Redundant arrays of independent disks (RAID) are ways to store the same data in different places (and therefore redundantly) on multiple hard disks. By placing data on multiple drives, I/O operations can overlap in a balanced manner to improve performance. Because multiple drives increase mean time between failures (MTBF), storing redundant data also increases fault tolerance.
-
Anonymous users2024-02-05A disk array is composed of many independent disks that are combined into a disk group with a huge capacity, and the additional effect generated by the data provided by individual disks improves the performance of the entire disk system. With this technology, the data can be slipped into many segments and stored on individual hard drives.
The disk array also takes advantage of the concept of homing-site checking, which can still read out data when any one of the disks in the array fails, and when the data is reconstructed, the data is calculated and re-placed into the new disk.
1. The interface is different.
2. The transmission speed is different (this is the most essential difference). >>>More
SATA is a serial hard disk, which is a type of serial ATA port. Generally speaking, there are two commonly used types: serial port and parallel port, and the serial port transmission rate is a little faster. Specifically, I was also looking for the following: >>>More
Economic goods are those that are useful and scarce.
Goods can be divided into two categories: one is economic goods; The second is free goods. The definition of an item is that there is better than nothing, and in what is better than nothing, there is a large part of more than less. >>>More
Scientifically, a group containing a particle is called a mole as a unit. Mole is a unit that represents the quantity of matter (the symbol is n), abbreviated as mole, and the unit symbol is mol. The basic unit of measurement of the quantity of a substance in the International System of Units (SI system) is referred to as mole, and the definition of moles at the 14th International Conference on Weights and Measures of the International Year of Symbols has the following two paragraphs: >>>More
Laws and regulations refer to normative documents formulated by state organs. >>>More