single shaft shredder is suitable for recycling wide range of materials. used in Plastic Recycling Machine industry. It is an ideal machine for plastic, paper, fiber, rubber, organic waste and a wide variety of materials. As per our customers` requirements, such as the input size of the material, capacity and the final output size etc, we could work out a suitable proposal for our clients. After being shredded by the machine, the output material could be used directly or go into the next step of size reduction. With the function of Siemens,microcomputer control system, it is possible to control automatically start, stop, automatic reverse sensors to protect the machine against over loading and jamming. Single Shaft Shredder,Single Shaft Shredder Machine,Single Shaft Plastic Shredder,Single Shaft Shredder Traduction zhangjiagang sevenstars machinery co.,ltd , https://www.sevenstars-machineries.com
What does 1U 2U of the server mean? How many servers can be placed in a 42U cabinet?
Friends have been asking many times what does 1U server mean? How many servers can be placed in a 42u cabinet? This question is often asked in our weak current VIP group. Let's summarize it together in this issue.
1. What is 1U?
With the rapid development of enterprise informatization, the demand for servers is also increasing . In the limited space of the computer room, how to plan and implement rationally, for us, we must pay attention to these issues. Rack-mounted servers have advantages over tower-mounted servers in terms of saving energy costs, maintenance costs, and environmental costs because of their flexible configuration and high computing density. These advantages provide a broad development space for the construction of large and medium-sized information systems for 1U servers.
So what is a 1U server? The so-called 1U server is a high-availability, high-density, low-cost server platform. U is the height of the server chassis. 1U is equal to 4.45 cm, and 3U is 3x4.5CM.
u (abbreviation for unit) is a unit that represents the external dimensions of a modular rack. The detailed dimensions are determined by the Electronic Industries Association (eia), which is an industry group.
The required dimensions are width (48.26cm = 19 inches) and height (multiples of 4.445cm) . Since the width is 19 inches, the racks that meet this requirement are sometimes called "19-inch racks." The basic unit of thickness is 4.445cm.
Server size specifications:
1U=4.45cm
2U=8.9cm
3U=4.45cm * 3
4U=4.45cm * 4
U is not a patent for servers. It was originally a rack structure used for communication exchange, and was later cited as a server rack. At present, it is used as an informal standard on the frame structure , including the specified screw size, hole distance, railing, etc.
1U and 2U are the thickness of the server. 1U is roughly equivalent to the three small grids of the cabinet, and 1U is 4.445 cm. The following is a picture:
2. Which server is better for 1U, 2U, 4U?
1. 1U, 2U, 4U, which server is better?
Our common rack servers are divided into 1U, 2U, and 4U. Nowadays, the popular servers in the market are 1U and 2U . So which one is the best? In fact, there is no best product, only the most suitable product. Each product has its own characteristics. As long as we fully understand the product and our own needs, we can easily select the most suitable machine. Then 1U and 2U servers are available. What advantage?
1U server advantages: saving space, low hosting cost;
2U server advantage: large expansion space, good heat dissipation;
If your server needs to load more than 4 hard disks or the like, choosing a 2U server is a good choice ; if the server does not need to load too many external accessories, then a 1U server is completely capable, and the computer room hosting is most suitable for 1U . The heat dissipation problem of the standard 1U server in the constant temperature and humidity environment of the professional IDC data center can also be handled well.
2. So what is a 1U server?
1U is limited in height and has special requirements for accessories, which will increase the overall hardware cost and the difficulty of selecting accessories. It can be said that 1U server is a high-availability, high-density, low-cost server platform , which is specially designed for special application industries and high-density computer environments.
1U server space is limited, and there are certain limitations in scalability and heat dissipation . Generally, it is impossible to achieve too complete equipment expansion . Compared with 1U server products, 2U has a moderate height, and its scalability (number of hard disk storage, expansion slots, power supply) has been significantly enhanced. Its heat dissipation has also been further improved. If the server hosting business is adopted, the hosting cost of 1U server is higher than that of 2U server. However, the specific selection of several U servers needs to be selected according to the project type, project scale, etc. to avoid waste of server resources and funds.
3. Common cabinet size? How many servers can be placed in a 42U cabinet?
The reason for specifying the size of the server is to keep the server at an appropriate size so that it can be placed on an iron or aluminum rack. The rack has screw holes for fixing the server so that it can match the screw holes of the server, and then fix it with screws to facilitate the installation of each server.
The specified size is the width (48.26cm=19 inches) and height (multiples of 4.445cm) of the server . Since the width is 19 inches, a rack that meets this requirement is sometimes called a " 19-inch rack ." The thickness is based on 4.445cm, and 1U is 4.445cm. See the table below for details:
1. What is the size of the 42u cabinet?
Answer: 42U is a server cabinet with a height of 2 meters, a width of 0.6 meters and a depth of 0.8 meters, or a server cabinet of 2 meters, a width of 0.6 meters and a depth of 0.96 meters;
2. How many servers can be placed in a 42U cabinet?
The number of servers in a cabinet is limited. A cabinet with a height of 42U does not mean that 42 1U servers can actually be placed. Because you have to leave room for heat dissipation and movement , you have to consider power supply , you have to consider overall heat dissipation, etc. There are places where there must be empty cables up and down, and other places such as switches, firewalls, and displays.
A certain brand of 42U standard cabinet can hold up to 18 sets of 20 servers . Why is there 20? There should be room for heat dissipation between the 1U server and the 1U server. At the same time, a switch should be placed in the cabinet, which also requires 2U space.
If it is a 2U server, you can usually buy about 10, plus you need to place switches, routers and other equipment. 3. Power of the server
The power consumption provided by a cabinet is limited. When the power consumption of the server increases, the fewer servers are placed. A cabinet generally provides 10A of power, and some cabinets can provide a higher 18A of power.
220V*10A=2200W. In other words, as long as the total power of your server does not exceed 2200W, the power consumption of the server depends on whether the server is running at full capacity. Generally, the power consumption of non-full load operation is lower than the rated power on the server.
Therefore, how many servers are placed in the cabinet also need to calculate the power.