What is an array computer What is an array?

Disk array is a technology that controls the interconnection of multiple hard disks by a hard disk controller, so that the reads and writes of multiple hard disks are synchronized, reducing errors, and increasing efficiency and reliability. The realization of this technology is the disk array product, the usual physical form is a cuboid containing a number of hard disks and other devices, in a certain organizational form to provide different levels of service.

Disk array implementation.

There are two ways to implement a disk array, that is, a "software array" and a "hardware array".

A software array refers to the configuration of multiple hard disks on a connected ordinary SCSI [what is SCSI] card into logical disks through the disk management function provided by the network operating system itself to form an array. For example, Microsoft's Windows NT 2000 Server Server 2003 and Netvoll's Netware [what is NetWare] two operating systems can provide software array functions, of which Windows NT 2000 Server Server 2003 can provide RAID 0, RAID 1, RAID 5;The NetWare operating system can implement RAID 1 functionality. The software array can provide data redundancy, but the performance of the disk subsystem will be reduced, and some of the degradation will be relatively large, up to about 30%.

Hardware arrays are implemented using specialized disk array cards, and that's what this article is about. Almost all of today's non-entry-level servers offer disk array cards, making it easy to implement array functionality whether they are integrated on the motherboard or non-integrated. The hardware array can provide functions such as capacity expansion, dynamic modification of array levels, automatic data recovery, drive roaming, ultra-high-speed buffering, etc.

It delivers solutions for performance, data protection, reliability, availability, and manageability. The RAID card has a dedicated processor, such as Intel's i960 chip, HPT370A 372, Silicon Image SIL3112A, etc., and also has a dedicated memory for high-speed data buffering. In this way, the server's operations on the disk are processed directly through the disk array card, so it does not require a large amount of CPU and system memory resources, and does not degrade the performance of the disk subsystem.

The performance of the array card is much higher than that of conventional non-array hard drives, and it is more secure and stable.

Several disk array technologies.

RAID (Redundant Array of Inexpensive Disks) technology is an industry standard, and the definition of RAID level varies from vendor to vendor. At present, there are four types of RAID levels that can be widely recognized by the industry, RAID 0, RAID 1, RAID 0 1, and RAID 5.

It's just a lot of computers all in one place. Do the same thing.

Disk arrays are abbreviated as RAID

Disk arrays are mainly aimed at hard disks, which cannot keep up with the development of CPU and memory in terms of capacity and speed, and propose ways to improve them. A disk array is a large disk group composed of many cheap, smaller, more stable, and slower disks, which use the additive effect of individual disks to provide data to improve the performance of the entire disk system. At the same time, when storing data, this technology is used to cut the data into many sections and store them on each hard disk.

Common RAID is the following:

RAID0: Set 4 hard disks to use as 1 whole hard disk, the capacity that can be used is 4 times the minimum hard disk capacity of the 4 hard disks, and the transfer speed will be slightly faster by using the decentralized writing method. Data cannot be recovered in the event of a hard disk failure.

RAID1: Set 4 hard disks as 2 groups of hard disks, the capacity that each array can use is the capacity of the smallest hard disks of each group, because the same data is stored in the same group of two hard disks at the same time, so when 1 of the 2 hard disks in the same group fails, it can also replace the new hard disk and restore the data (when the 2 hard disks in the same group are faulty, the data cannot be restored).

RAID 5: Set up 4 hard disks as a whole array, the capacity that can be used is 3 times the capacity of the minimum hard disk, and the parity (error correction symbol) will be generated while writing data, and when 1 hard disk fails, it can also be replaced with a new hard disk and restore the data. (Data cannot be restored when two or more hard disks fail).

RAID 10: Set up 4 hard disks to be used as a whole array, which can use twice the capacity of the minimum hard disk. The decentralised write method is used, so the transfer speed will be slightly faster.

Since the same data is stored in two disks in the same group at the same time at the time of writing, it is possible to replace the new disk and restore the data if one of the two disks in the same group (1-2 or 3-4) fails.

clone: sets 4 disks to be used as a whole array, and the capacity that can be used is the capacity of one disk. When writing, the same data is stored in four hard disks at the same time to achieve the cloning function.

Definition of technical terms.

Chinese name: array.

Product Name: array

Definition: The orderly solidification of many nucleic acid fragments, peptides, proteins, tissues, cells and other biological samples on the surface of an inert carrier (slide, nylon membrane, etc.) to form a system for biochemical reactions and analysis to improve the efficiency and scope of analysis, and further develop into microarrays or biochips. Applied Disciplines:

Biochemistry and Molecular Biology (first-level discipline); Methods and Techniques (Secondary Discipline).

What does a RAID disk array mean? What's different about RAID ?

The disk array is RAID, including RAID 0 RAID 7 and other specifications, and RAID is commonly used. At present, the first three types are mainly supported by personal motherboards. This technology is primarily intended to expand partition capacity or data security. Prerequisites for using the technology:

1.Motherboard supports or has array cards;

2.You must have at least two or more hard drives of the same specification and model.

Array, also known as display, refers to the formation of a combat queue. The former Shu Weizhuang has the poem "Traveling to Yongxi, Seeing Children with Bamboo Guns and Paper Flag Plays as the Array, and the Master Suo Said Sizi Ye III Didn't Think About the Attack of His Grandfather Yu Yu Because of the Feeling".