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This article introduces the relevant knowledge of "what is the necessity of using SSD solid state disk in server hardware equipment". In the operation of actual cases, many people will encounter such a dilemma, so let the editor lead you to learn how to deal with these situations. I hope you can read it carefully and be able to achieve something!

At present, the Internet webmaster is worried about nothing more than the website server. With the increase in the number of visits, the server began to feel overwhelmed, the performance not only became poor, and sometimes simply shut down "strike". What is the main reason for this? Many years ago, after many tests, the technology of China net Science and Technology finally found that the "culprit" was the hard drive! Because the server runs 24 hours a day, reading and writing for a long time accelerates the aging of the hard disk, coupled with the increase in the number of website visits, the reading and writing frequency of the mechanical head increases, resulting in a significant decline in the load capacity of the server. If you think the server is not fast enough? Presumably, the throughput performance of Ipaw O is one of the important bottlenecks.

If you replace a traditional hard disk, the help is limited, because the performance of the mechanical hard disk has not made a big breakthrough for so many years, and it is easy to be damaged due to mechanical wear after several years of use, which has become the biggest bottleneck affecting the performance of the server. At present, the main way to improve the internal performance of the hard disk is to accelerate the speed of the disk spindle and the seek speed of the head, and to improve the data storage density of the disk. However, from the current development level of motor technology, although the spindle speed has broken through the 15000RPM, because the higher speed must mean the decline of stability, heat dissipation and other aspects of performance, so the improvement of spindle speed is limited; the magnetic head seek speed will also be restricted by this level of electromechanical technology. Currently, replacing the SSD solid state drive is the most critical way to improve the speed of the server.

Solid state hard disk (SSD hard disk) does not have any mechanical structure, excellent seismic performance, read and write speed as high as 180MB-600MB/S per second, and built-in large-capacity cache, so that the overall operation efficiency of the system is greatly improved, especially for small file access that occurs frequently in daily use, the efficiency is improved by more than 5 times. At present, a typical SSD can perform up to 16000 random reads and writes per second, 80 times that of a traditional hard disk. Generally speaking, in the environment of high random read and write, one SSD hard disk can be used as 30 traditional hard disks; website servers, database servers and file servers have high requirements for random read and write performance, so the high read and write performance of SSD solid state drives can better meet the needs of the above applications.

Hard disk performance bottlenecks limit the development of servers:

Hard disk (English name: Hard Disc Drive, abbreviated as HDD, full name: Winchester hard disk), as one of the main storage devices of PC and server, plays an important role in the whole server system. Most of our data is stored through hard disk.

Why is the hard disk the last performance deficiency of the server system? At present, the development of server accessories such as CPU, memory, graphics card and so on can be described with each passing day, but the development speed of hard disk is very slow. Since IBM launched the world's first hard disk in September 1956, the speed of mainstream hard disk has stayed in 7200RPM for many years. Except for the continuous increase in capacity, other aspects of performance have not been able to be improved more effectively. It can be said that the performance of the hard disk has limited the overall performance of the server system to a certain extent. The world's first hard drive had a capacity of only 5m and was a behemoth of 50 disks 24 inches in diameter; today, even 3.5 inches is unbearable. It can be seen that driven by the application demand, the hard disk, especially the server hard disk, will have better technologies to improve the overall performance. There is no doubt that the development of technology is endless. The competition among hard disk manufacturers and the growing consumer demand of users will naturally promote the continuous emergence of newer and better hard disk technology.

Why can't the performance of hard disk grow rapidly? what is the main constraint? Before answering this question, let's take a look at the internal structure of the hard disk: the hard disk mainly includes: disk, read-write head, disk spindle, control motor motor, head controller, data converter, interface, cache and so on. (here we need to remind you, do not open the shell of the hard disk at will, because the interior of the hard disk can not be stained with dust, otherwise it will be scrapped immediately. )

To improve the performance of the hard disk, the popular point is that the more sectors the head can read per unit time, the better the performance, so it can only be achieved by increasing the rotational speed and improving the track density of the disk. While the speed of the mainstream hard disk is almost impossible to break through at 7200 rpm, if it is more than 10,000 rpm, not only the cost of the hard disk will increase a lot, but also the heating noise will increase a lot, and it is also very difficult to improve the track density. so the performance of the hard drive is not growing rapidly.

However, with the development of science and technology, there are many ways to change this situation, which to some extent solve the problem of performance deficiency of hard disk in server system. Today, we will compare and analyze the performance differences between these different ways through several evaluation projects to let you know which one is more suitable for you.

Mainstream ways for servers to improve hard disk performance:

A high-performance mechanical hard disk with a rotational speed of 10000RPM or 15000RPM. The ten thousand-speed hard disk, which is mainly used for enterprise applications and high-end desktop, has always been the symbol of the high-end desktop-level hard disk. With the introduction of server hard disk technology, it has greatly reduced the bottleneck effect brought by disk performance and is the last king of desktop high-performance mechanical hard disk.

Second, use more than two hard drives to build RAID. RAID is the abbreviation of "Redundant Array of Independent Disk", which means independent redundant disk array in Chinese. At present, there are many modes such as RAID0~RAID7. From the perspective of daily application, RAID0 disk array mode is the most suitable for ordinary users, it can not only greatly improve the hard disk performance, but also do not have to sacrifice the hard disk capacity.

Third, solid state hard disk based on flash storage media. Solid-state hard disk (Solid State Disk or Solid State Drive), also known as electronic hard disk or solid-state electronic disk, is a hard disk composed of control unit and solid-state storage unit (DRAM or FLASH chip). Its reading speed is faster than that of mechanical hard disk, and the seek time is almost zero, so it has the advantages of not being afraid of vibration and shock, no working noise, extremely low calorific value and so on.

Fourth, integrate the flash memory directly into the hybrid hard disk on the traditional hard disk. The so-called hybrid hard disk (HHD), also known as solid-state hybrid hard disk (SSHD), can be seen as a product between traditional mechanical hard disk (HDD) and solid-state hard disk (SSD). A small amount of NAND flash memory is added to the mechanical hard disk to integrate the flash memory module directly into the hard disk, which can provide faster reading and writing speed while having the original large capacity of ordinary mechanical hard disk.

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