IDC Server hosting technical terminology Explain what is server _ server

If your site traffic is too large a general virtual host space can not meet your needs, then you have to consider the purchase of a hosting server.

(1). What is a server

Server is a high-performance computer, as a network node, storage, processing network 80% of data, information, so also known as the soul of the network. To make an image of the analogy: the server is like a post office switch, and computers, notebooks, PDAs, mobile phones, such as fixed or mobile network terminals, such as scattered in the home, a variety of office space, public places, such as telephones. Our daily life with the outside world, the work of telephone exchanges, communication, must pass through the switch to reach the target phone; Similarly, network terminal equipment such as home, the computer in the enterprise Internet access, access to information, communication with the outside world, entertainment and so on, must also go through the server, so it can be said that the server in the "organization" and "leadership" These devices.

The composition of the server is similar to the computer, there are processors, hard disk, memory, system bus and so on, they are specially formulated for specific network applications, so the server and the computer in the processing capacity, stability, reliability, security, scalability, manageability and other aspects of the difference is great. In particular, with the progress of information technology, the role of the network more and more obvious, the data processing capacity of their own information systems, security and other requirements are more and more high, if you are in the process of e-commerce by hackers stolen passwords, loss of key business data; If you can't access the ATM You should consider the behind-the-scenes commanders ———— servers in these device systems, rather than blaming staff for their quality and other objective conditions.

(2). Technical terminology Explanation of IDC server hosting

1. Server:

The server's English name is "server", which refers to a special dedicated computer system that provides various services to client computers in a networked environment. The "client" here refers to a PC with an operating system installed with DOS, Windows 9x, and other common user documentation. As you can see from the concept of a server, a server is also a kind of computer, except that it is a special computer that provides services to other computers and has unique features that distinguish it from ordinary computers.

The concept of 2.U:
1u=1.75 inch = 4.445cm. The room provides a U unit of space 4.5*58*62 cm (high * wide * deep), placing a rack-type server and its ancillary equipment.

3.CPU (processing Unit)

Central processing unit, CPU is the heart of the computer, including operational components and control components, is the core of the various operations and control, but also determine the computer performance of the most important components. The main parameters are the frequency of the work and the number of bits of data transmitted or processed at a time.

4. Hard disk:
The hard drive is where the most important data is stored. Very much of the data required for execution is read from the hard disk. Once the hard drive is damaged, no data can be used, so the hard drive is the most important storage device. The larger the capacity of the hard disk, of course, the more data the server can store.


Hard disk capacity: Often hear hard disk space is 3.5GB or 4.5GB. GB is the unit of capacity, 1GB is approximately equal to 1 million bytes (byte), also about 1000MB. The size of the hard disk of course the larger the better, the larger the capacity can store more data.




The speed of the hard disk: the speed of the hard drive is the speed of the motor, the faster the speed, the faster the speed of reading and writing data. So the faster the speed of the hard disk, the price is relatively high. The current speed of the hard drive, the common has 5400 rpm and 7200 rpm two kinds.


5. Memory:
DDR:DDR (dual data transmission rate) SDRAM provides dual memory bandwidth, which is more efficient than SDR (single data transmission rate) SDRAM.
RAM: Random access memory RAM (Random Access Memory): RAM is memory that can be read and written, and we can read data from RAM while writing to RAM memory, which is different from ROM memory. But RAM has to keep its stability by stable, fluid power, so once the power is turned off, the data that was originally in RAM will disappear.

Shorthand for Ecc:error Checking and correcting (error checking and correction). It is widely used in various fields of computer instructions in the memory of the error correction, the computer operation instructions can continue to execute.

Most common mistakes in memory are: unit error, multiple-digit error, wrong column, line error. They are all quite similar. Most of the unit errors occur when you read a complete bit or word with a bit error. When you read the same bits and words and always have the same data error, it is called a multiple-bit error. The unit error occurs in many words, which is called the wrong column or row.

How these errors are corrected: ECC memory uses an extra bit (bit) to store a code that is encrypted with data. When the data is written into memory, the corresponding ECC code is also saved at the same time. When you reread the data that you just stored, the saved ECC code is compared to the ECC code that was generated when the data was read. If two codes are not the same, they are decoded to determine that the one in the data is incorrect. The error bit is then discarded and the memory controller releases the correct data. The corrected data is rarely put back into memory. If the same error data is read again, the corrective process is executed again. Rewriting the data increases the overhead of the processing process, which can lead to a noticeable reduction in system performance. If the error is caused by a random event rather than a memory defect, the error data for that memory address is replaced by other data that is written again.

6.RAID:

RAID (Redundant array of independent disks) storage technology can improve the performance and reliability of the data storage subsystem. The primary goal of developing RAID is to distribute large amounts of data to small disk arrays, which are like a "logical" hard disk for the server's operating system.

The Intel integrated RAID controller and software facilitates the raid advantage of E-commerce applications in the storage subsystem (containing 5, 8, or more standalone disks). Choosing raid means that even if a hard drive fails, the server and network remain fully operational and do not lose data. In the early stages of RAID development, the "I" generation quot in raid, the price economy. The industry has gradually changed the meaning of the letter "I" as the cost of large-capacity hard drives has plummeted. It now means "freestanding". This illustrates one of the main advantages of the RAID subsystem: a stand-alone disk with the ability to protect data, improve network storage performance, and keep the server running properly.

A failure of a hard drive can cause server downtime, degraded network performance, and disruption of e-business applications, and properly configured RAID arrays help prevent this from happening.

Choosing raid means that even if a hard drive fails, the server and network remain fully operational and do not lose data. In some cases, users on the network will not even notice that the hard drive has failed.

The hot plug feature, supported by the Intel integrated RAID software, enables you to disassemble and replace the failed hard drive while the server is operating properly. The continued decline in the price of fast high-capacity hard drives makes raid a more attractive storage technology for e-business enterprises.



7. Flow:

Network traffic reflects the number of packets passing through the network and how crowded it is.
Byte: is a unit that measures the size of a file and is typically used to describe the size of a drive or disk, 8 bits = 1 byte.

8. Bandwidth:

Used to measure the speed at which a server is connected to the Internet for data transmission, in bps (bit per second).

Input bandwidth: From the server's point of view, we define the speed at which input bandwidth (Inbound bandwidth) can transfer data from the Internet to the server.

Output bandwidth: From a server perspective, we define the speed at which output bandwidth (outbound bandwidth) transmits data from the server to the Internet.

The Bandwidth measurement Unit is: Bit,bit called bit, is the smallest unit of computer memory, 1Bit has 0 and 12 kinds of changes.