Classification and characteristics of servo drive
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Observing servers from different angles, you can classify servers in different ways. Let's discuss the classification of servers from different angles.
1. According to different architectures, servers can be divided into two important categories: IA architecture servers and RISC architecture servers.
The main basis for this classification is the different processor architectures used by the two servers. The CPU used by the RISC architecture server is the so-called reduced instruction set processor. The main feature of the reduced instruction set CPU is that it adopts fixed-length instructions and uses pipelines to execute instructions. The processing of such an instruction can be divided into several stages, and the processor has different settings. The processing unit executes different stages of instructions. For example, if the instruction processing is divided into three stages, when the Nth instruction is in the third processing stage, the N+1th instruction will be in the second processing stage, and the N+2th instruction will be in the second processing stage. instruction will be in the first processing stage. This pipelining of instructions enables the CPU to process instructions in parallel, which enables the processor to process more instructions per unit time. The IA architecture server adopts the CISC architecture, that is, the complex instruction set architecture. The characteristics of this architecture are that the instructions are longer, the functions of the instructions are stronger, and a single instruction can perform more functions, so that we can increase the number of operations. A unit that enables the functions performed by an instruction to be executed in parallel to improve computing power. The two architectures have been growing in competition with each other for a long time, and both have achieved rapid development.
The server of the IA architecture adopts an open architecture, so it has a large number of supporters of hardware and software, and has made great progress in recent years. [2]
2. According to the size of the server, the server can be divided into workgroup server, department server and enterprise server.
This classification method is a relatively old classification method, and it is mainly classified according to the scale of the server application environment. For example, a computer network environment with about ten clients is suitable for using a workgroup server. This kind of server often uses one processing server, small hard disk capacity and not very strong network throughput; a computer network with dozens of clients is suitable for department-level servers, department-level servers are relatively powerful, often using 2 processors, larger memory and disk Capacity, disk I/O and network I/O capabilities are also strong, so that this server can have enough processing power to accept the service requirements put forward by clients; while enterprise-level servers are often located in networks with more than 100 clients environment, in order to respond to a large number of service requests, this kind of server often uses 4 processors, has a large number of hard disks and memory, and can be further expanded to meet higher demands. The network speed and disk speed of the server should also be high. To achieve this requirement, multiple network cards and multiple hard disks are often used for parallel processing. All the above descriptions are very imprecise, and there are many special cases. For example, there may be many clients on a network, but there may be few accesses to the server, so there is no need for a super-powerful enterprise-level server. Due to these factors The existence of the server makes the classification method of this kind of server more inclined to qualitative rather than quantitative, that is to say, from the group level to the department level to the enterprise level, the performance of the server is gradually strengthened, and other characteristics are also gradually strengthened. .
3. According to the different functions of the server, we can divide the server into many categories
Such as file/print server, which is the earliest type of server, it can perform the service of file storage and printer resource sharing, so far, this kind of server is still widely used in office environment. Database server, running a database system for storing and manipulating data, providing data query and modification services to networked users, this kind of server is also a server widely used in commercial systems. WEB server, E-MAIL server, NEWS server, PROXY server, these servers are typical of INTERNET application, they can complete the storage and transmission of homepage, e-mail service, newsgroup service and so on. All these servers mentioned above are not just a hardware system, they often achieve their specific functions through a combination of hardware and software.
