Why choose dedicated servers instead of PCs as servers?

Source: Internet
Author: User
Tags dedicated server domain server

1. When data is exchanged between the client and the domain controller, each client occupies about 400-K of system resources, that is, about computers in SMT are added to the domain, therefore, when a policy is applied to the client, the system allocates the following resources to the client: 400*400 K or 200 * K, which may be between-M, although the probability of applications to each client at the same time is small, the domain controller should have the function and stability to process data of each client at the same time.

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2. Integrate the WSUS server on the Domain Server. Each client downloads the resource occupied by the update package from the WSUS server between-kb, the resource used when an update package is distributed to each client is about 800m-1g.

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3. the design concept of an ordinary PC is: 5x8 hours of work, while the design concept of a server is: 7x24 hours of work.

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Iv. scalability, availability, manageability, dedicated server de,and availability of service machines. servers refer to special dedicated computers that provide various services to clients in the network environment. In the network, buy virtual dedicated server, the server is responsible for data storage, forwarding, publishing, and other key tasks. It is an indispensable part of various Client/Server (C/S) mode networks. As a server, the first requirement is that it must be reliable, that is, "availability ". Because the server is facing the users of the entire network, rather than the users logged on from the local machine, the server cannot be disconnected as long as there are users in the network. Generally, dedicated servers require 7x24 hours of uninterrupted operation. To provide services to so many users, servers without high connections and computing performance cannot be tolerated. This means that servers are "available ". 

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The server must also have certain "scalability", because the network cannot remain unchanged for a long time. If there is no scalability, when the number of users increases, the number of servers is tens of thousands, even hundreds of thousands of servers will be eliminated in a short time, which is unacceptable to many enterprises. To maintain high scalability, you usually need to have a certain number of scalable space and redundant parts on the server (such as disk matrix bit, PCI and memory slot ). In terms of the main features of the server, there is also an important aspect, that is, the server must have a certain degree of automatic alarms, and have corresponding redundancy, backup, Online Diagnosis and recovery systems, in case of a fault, the server can be recovered in time, which is "manageability ". The server mentioned above is "four features", "scalability, availability, manageability and availability", that is, the server "Suma" we often see ".

Dedicated server 


V. Differences between servers and desktops:

The differences between servers and PCs are shown in the following aspects: CPU and multi-processor, main version, bus system, network performance, disk storage performance, memory system, heat dissipation system, operating system, and so on are very different from PCs. The server is mainly used in enterprise and individual work. Unlike the home desktop, the server's task is to ensure that users can access the server smoothly through the terminal at any time, and transmit and share data in the server. Therefore, the most important thing for a server is not high speed and high performance, but high stability, that is, the ability to run correctly for a long time. Desktops are mainly used for personal simple applications and Home Entertainment, so they focus more on performance.


A desktop board is a PC-connected motherboard that uses a desktop chipset and supports only one processor. The memory generally supports 8 GB and generally does not support ECC, the power supply of the general chassis can meet the requirements. Generally, the storage interface uses the IDE or SATA interface. Some of the more advanced boards support the RAID 0 and 1 Disk Array technologies. It has an integrated Nic chip, a low-end 10/100 Mbps adaptive Nic, and a high-end Gigabit Nic, but only a single Wan port, most of which do not support Server Load balancer. The server motherboard is a product dedicated to servers. It has a large board type and uses a dedicated power supply for the server chassis. Although some low-end entry-level server products also use high-end desktop chipset, high-end products use dedicated server chipset. The most important thing about the server motherboard is high reliability and stability, followed by performance, which is the biggest difference with the desktop motherboard. This also fully reflects the differences between applications on servers and desktops. Because the server generally needs to run at full capacity 24 hours a day and 7 days a week, stability and reliability are the most important points.


The most important parameter for a common CPU is the clock speed. The higher the clock speed, the faster the computing speed, but the lower the speed is in the server CPU. Generally, the server CPU frequency is relatively low, for example, Intel's server CPU clock speed is usually around P4 2.0ghz, which is far lower than the PC's CPU speed of GHz, while other brands have lower CPU clock speed, however, these server CPUs have excellent computing performance. The higher the CPU clock speed, the higher the heat emitted during operation, which brings the biggest unstable factor to the server. On the other hand, the higher the server computing performance, not only through the increase of the clock speed, it is generally enhanced by other parameters. In addition, most medium and high-end servers can greatly improve the overall computing performance of servers through symmetric multi-processor systems, there is no need to improve the computing performance by clock speed in a single CPU. Note that the number of CPUs on the server must be double, that is, the so-called "symmetric multi-processor system ".



You can often see that desktop memory such as DDR 600 and DDR2 800 focuses on low latency and high frequency, but Server Memory focuses on stability and reliability. The server usually uses ECC and Reg ECC memory. because ECC memory needs to meet the verification and Error Correction requirements, an ECC validation granule is added. Because the tosp encapsulation is used, the server memory has nine memory particles on each plane. In the memory, ECC can tolerate errors and correct errors so that the system can continue normal operations without interruption due to errors, and ECC can automatically correct errors, the error bit can be detected and corrected. Of course, the system performance is significantly reduced during error correction, but this error correction is very important for servers and other applications.


Hard Disk

The server's hard drive speed is the highest, with 10000 or even 18000 rpm. Most of the interfaces use SCSI. Server hard disks are mainly stable, secure, and large-capacity. Currently, the maximum transmission speed of SCSI is 320 Mb/s and that of Sata is 150 Mb/s. PC hard drive is the most cost-effective. The mainstream is 7200 RPM, and the mainstream interface is Sata.


Power Supply and Fan

In a general PC chassis, there are only two fan ports for cooling ~ Three, respectively, inside the front bezel of the chassis and inside the back bezel. The server chassis requires more air outlets, and each air outlet is used to heat different heat sources in the system. The CPU used by the server is usually high, some are dual CPU or multiple CPUs, plus several high-speed SCSI hard disks and high-power supplies, the heat from these components makes the chassis quickly become hot, whether or not hot air can be discharged as soon as possible is an important condition for stable server operation. In addition to installing multiple fans, the server chassis should also have a good heat dissipation design. For example, many servers design two fan spaces on the back, one blow and one suction, so that hot air is discharged and cold air enters, A heat dissipation cycle system is formed, which improves the performance of the entire heat dissipation system of the server.


Differences between stability and reliability:

Generally, a desktop only needs to be able to run for 8 hours a day, and its failure will not affect other machines and customers, that is, the failure or restart of the desktop will not cause too serious impact and loss. Therefore, the design is relatively simple, and the verification and testing of desktop components are also relatively simple. However, the server is completely different. It requires at least 99.9 of high availability, that is, the average failure time per day is less than 1.5 minutes. In order to meet the high reliability and high availability requirements of servers, the server motherboard has gone through more rigorous processes and procedures in the R & D, design, production, and testing stages. In addition, the key components of the server have taken into account the Redundancy Design. For example, the SMP symmetric multi-processor technology is used to ensure that the entire system is not affected when a CPU failure occurs; ECC parity memory is used to protect the integrity of memory data, RAID technology is used to protect the integrity of hard disk data, and multiple server NICs can achieve redundancy protection, load balancing, and other features; supports hot swapping of redundant power supplies and fans.


Performance differences:

The performance of the server board is much higher than that of the desktop board, especially in terms of memory channel bandwidth and I/O processing capability. The memory channel of the server board usually has two or even four parallel transmission buses, so the bandwidth between the memory and the chipset is usually two to four times the bandwidth of the desktop board. The I/O bandwidth of the server board is usually higher than 266 GB, while the desktop usually only MB (excluding the display card bus bandwidth), the difference is more than 10 times. In addition, the server can support multi-channel CPU Parallel Processing, support 32 GB or more massive memory, support high-speed PCI (64bit/66 MHz), PCI-X (64bit/133 MHz) I/O channel, supports ultra160/320 high-speed SCSI hard drive interfaces, which are not available on desktops.


Differences in scalability:

The server usually supports good scalability. Its CPU, memory, pci I/O, disk I/O, network I/O, and so on can be flexibly expanded, and there will be no system performance bottlenecks


Differences in manageability:

Servers usually require good manageability, which is guaranteed by the special implementation of the hardware and software of the servers. Through server management software, the system administrator can conveniently view the current working status of the server, the health status of important server components, remote restart/startup/shutdown, remote server maintenance, BIOS redirection, and so on.


Differences between operating systems:

The operating systems used by servers and desktops are also different. server operating systems support powerful server platforms, for example, multi-CPU, 4 GB memory or above, log-type file systems, server cluster software, and so on, while the desktop operating system is generally windows professional XP, only GB memory is supported and cannot meet the above requirements. In addition, the operating system kernel of the server is more stable and the performance is better.


Differences between applications:

Applications installed on server hardware and operating systems are usually Internet/Intranet server applications, enterprise or commercial key applications. Desktops are usually used for personal applications and graphics applications. The positioning of the two is completely different.


From this we can see that using desktops as servers can cause many problems and even system security risks, including system performance degradation, downtime, restart, and crash.

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