How to choose the right cabinet in the weak current project?

Many people think of the cabinet as a cabinet for IT equipment. Cabinets are cabinets, but they are not the only ones.

For the computer itself, the cabinet also has an important auxiliary role with the UPS power supply. A good cabinet means that the computer can be operated in a good environment. The cabinet systematically solves the problems of high-density heat dissipation in computer applications, a large number of cable attachment and management, large-capacity power distribution, and full compatibility with rack equipment of different manufacturers, thereby enabling the data center to operate in a highly stable environment .

Therefore, the role played by the cabinet is equally important.

Choosing a deeper cabinet allows two sets of equipment to be installed face to face, thereby installing more equipment. In the above manner, two rows of equipment can be loaded into the cabinet, one row is loaded and unloaded from the front door of the cabinet, and the other row is loaded and unloaded from the rear door. The cabinet should have an adjustable position. After calculating the cabinet space (in units of "U or 1.75 inches"), the size of the room must also be considered. You will not want to see that you will need to install some equipment soon after seeing the cabinet full.

Once you buy the cabinet and install it, these extra devices often have problems. As a basic principle, the height of the cabinet should be 20% 30% higher for system expansion. These spaces also improve the ventilation of the equipment. The equipment installed with the bracket does not need to consider the width, because it is designed according to the width of the cabinet, but for the server and other peripherals that cannot be installed with the bracket, the width cannot be ignored.

Because the total weight of the equipment is often not light, choose a cabinet that can hold about 1500 pounds, that is, choose a strong cabinet with a strong structure. Inside the cabinet, the weight of the equipment determines whether the selected sliding frame is standardized or heavier, and also determines the choice of other accessories. Choose a cabinet that is 100% compatible with all servers. It must meet or exceed all OEM and manufacturer's third-class bracket specifications. If you want to install tower or desktop equipment, sliding racks and mounting accessories are required.

Since the device includes network cables, telecommunication cables, and power cables, it is necessary to purchase hook-and-loop straps or toothed straps to effectively fix the cables in the cabinet in an orderly manner. If the cabinet has a cable management module so that the cables can be directly fixed in the vertical device rail, it would be great. In either case, the upper and inner walls of the cabinet should have enough retaining rings (to protect the cables). You can also lift the bottom panel of the cabinet to facilitate wiring below.

Although the cabinets look almost the same, there are several types of subdivision according to their different uses. The rare ones are the cabinets used for wiring and the cabinets used to house the servers. The cabinets used for wiring are generally used to place There are multiple terminal switches, so there will be a lot of network cables that need to be taken out, and it is not convenient for the cabinet to get a door, so this cabinet looks more like a rack, and some cabinet manufacturers call this product as a wiring rack; The cabinet in which the server is placed must have doors and locks because it is necessary to protect the valuable equipment inside, so relatively noble routers and firewalls are generally placed in such cabinets.

Take the server cabinet, there are different grades: this is an ordinary server cabinet, glass doors, four cooling fans of the server cabinet, installed on the top of the cabinet, mainly used for ventilation and heat dissipation purposes, to provide good inside the cabinet In the constant temperature environment, the bottom of the cabinet is hollow for ventilation and heat dissipation. The heat dissipation effect of the server on the top of this cabinet is very good, but the heat dissipation of the server in the lower middle is not ideal.

The above cabinet is a relatively high-end server cabinet, which is ventilated and heat dissipated through the dense air holes on the front and rear doors. Therefore, the air conditioner in the computer room can be well distributed around each server in the cabinet, and the cooling effect of the entire cabinet is good. Moreover, the cabinets are made of materials that are anti-corrosion, anti-rust and load-bearing.

1. Reliable quality assurance

Choosing a suitable server cabinet and wiring cabinet is very important, and slight negligence may cause huge losses. No matter which brand of product, quality is the first link users must consider.

2. Weight-bearing guarantee

As the density of products placed in the cabinet increases, good load-bearing capacity is the basic requirement for a qualified cabinet product. A cabinet that does not meet the specifications may not be able to effectively protect the equipment in the cabinet due to the poor quality of the cabinet. As a result, the entire system may be affected.

3. Temperature control system

There is a good temperature control system inside the cabinet to avoid overheating or overcooling of the products in the cabinet to ensure the efficient operation of the equipment. The cabinet can choose the full ventilation series, and can be equipped with fans (fans have a life guarantee), an independent air conditioning system can be installed in a hot environment, and an independent heating and insulation system can be installed in a severe cold environment.

4. Anti-interference and others

A full-featured cabinet should provide all kinds of door locks and other functions, such as dustproof, waterproof or electronic shielding, etc .; it should also provide suitable accessories and support for installation accessories to make wiring more convenient and easy to manage ,save time and energy.

5. After-sales service

The effective services provided by the enterprise, as well as the comprehensive equipment protection solution provided, can bring great convenience to the user's installation and maintenance.

6. Power distribution system

How does the cabinet cope with the rise of power density? With the increasing trend of IT high-density installation in the cabinet, whether the cabinet can exert its effective performance, the power distribution system becomes a key link. Reasonable power distribution is directly related to the availability of the entire IT system, and is an important basis for whether the entire system can play its effective function. This is also a problem that has been ignored by many computer room managers in the past. Due to the increasing miniaturization of IT equipment, the density of equipment installation in the cabinet continues to increase. Taking a 7U blade server as an example, one requires about 3kVA of power distribution, and a 42U high cabinet may install up to 8 such The total demand for power distribution of the server will reach 24kVA. This poses a severe challenge to the power distribution system in the cabinet. At the same time, the increase in input and output ports also puts high demands on the reliability of the distribution system installation.

The reasonable design of the cabinet power distribution system should follow the principle of reliability design as the core, specifically designed for the cabinet system, fully coordinated and seamlessly coordinated with the power distribution system, while considering the convenience of installation and intelligent management , Strong adaptability, easy operation and maintenance. The power distribution system of the cabinet should make the power supply closer to the load to reduce the point of failure in the power supply path. At the same time, the local and remote monitoring of the load current and the remote control of the power distribution should be gradually realized, so that the power distribution management should be included in the overall intelligent management system of the computer room.

7. Cable layout

What should I do if there is a problem with the cable? In a huge computer room, it is still difficult to walk through the cabinets, let alone quickly find and repair the faulty line. Whether the overall solution of the cabinet is in place, the management of the cable by the cabinet will become one of the key links of the inspection.

From the perspective of cable attachment inside the cabinet, today's data center has a higher density of cabinet configuration and more IT equipment. It uses a lot of redundant accessories (such as Foshan Electrical Appliances, storage array, etc.), and the equipment configuration in the cabinet changes frequently Data lines and cables increase or decrease at any time. Therefore, the cabinet must provide sufficient cable channels to allow cables to enter and exit from the top and bottom of the cabinet. Inside the cabinet, the cables must be laid in a convenient and orderly manner, close to the cable interface of the equipment to shorten the wiring distance; reduce the space occupied by the cables, and ensure that the equipment is not interfered by wiring during installation, adjustment, and maintenance. And to ensure that the cooling airflow will not be blocked by the cable; at the same time, in the event of a fault, the device wiring can be quickly located.

When planning a data center that includes servers and storage products, we often don't care about the "small details" such as cabinets and power supplies. However, in the actual installation and use of the system, these supporting facilities also have a significant impact on the reliability of the system. From the perspective of price, cabinets and racks range from several thousand yuan to tens of thousands of yuan, which is completely incomparable with the value of internal equipment. Due to the concentration of equipment inside the cabinet, some particularly "critical" requirements for the cabinet and rack are determined. If you do not pay attention to the selection, the troubles caused by the use may be huge.