Server and switch connection and campus network construction scheme

Let's introduce the connection between the server and the switch and the construction scheme of the campus network. When it comes to servers, they are actually similar to the computers we use daily. They are devices that provide computing services. The composition of the server includes processor, hard disk, memory, system bus, etc. Since the server needs to respond to service requests and process them, generally speaking, the server should have the ability to undertake and guarantee services.

The server can be single, dual, four, or eight, which corresponds to the number of CPUs loaded. For example, the four way server has four CPU processors. The more lines the server has, the stronger the data processing capacity. Generally, there is no optical port on the server motherboard, only a bus interface. The interface standards include PCI, PCI-X, PCI-E, etc. These sockets are inserted with optical network cards, and then optical modules+optical jumpers are inserted through optical network cards to connect with switches.

A switch is a network device that forwards electrical signals. It can provide independent electrical signal links to any two network nodes. Common port types on the switch include Gigabit SFP, 10 Gigabit SFP+, 25G SFP28, 40G QSFP, 100G QSFP28, etc. Now let's introduce how the server is connected to the switch.

Usually, the networking topology scheme is to connect Ethernet to the firewall, connect the firewall to the core router, and connect the router to the WEB server. We can insert an optical network card matching the switch port rate on the server as needed. Take the 10G optical network card as an example. The 10G DAC/AOC or 10G SFP+optical module can be used with optical jumper to connect to the 10G SFP+upstream port of the gigabit access layer switch, Then the downlink gigabit port is connected to the computer and other user equipment.

We can take the establishment of campus information portal as an example. The information portal consists of portal interface management, unified identity authentication service and application management service. This solution mainly includes the Web publishing subsystem for load balancing, the database dual machine high availability subsystem, the FC-SAN storage and backup subsystem, and the hardware security firewall. Considering the reliability and stability of the system, for the storage system, it is recommended to adopt redundant structure to improve the overall reliability of the system, and configure an online all fiber array with dual controllers and redundant fiber switches.

1、 Web publishing subsystem construction:

Web server is the information publishing platform of the application system. In the multi tier architecture of the application system, the portal, as the information publishing layer, provides information browsing, service positioning and other functions. The WEB server mainly completes the following tasks: first, it receives user access requests and maintains user connections; Next, the user access request is sent to the application service, and the query processing result of the application service is waiting; Finally, the processing result page of the receiving application service is provided for users to browse.

When we choose a Web server, we can choose it according to the business forecast data. Based on the estimation of a school with 20000 people, its SPECweb2005 value is about 57000, which can be configured with a strong CPU, 3TB memory, and 16G running memory.

2、 Construction of database dual high availability subsystem:

For a school with 20000 people, the TPC-C value required for the database server is about 800000. We can choose the database server according to the business pressure and application scale. In addition, each server is configured with a dual port 8GB FC HBA card for connecting storage devices.

3、 Storage system construction:

The system design considers the reliability of key applications and the security of data. Full redundant FC SAN architecture (2 FC HBA cards, 2 optical switches and redundant disk array controllers) can be used to ensure the reliability of key data; The main storage disk array is recommended to use an all fiber AS5500 disk array, with two controllers and eight 16Gb optical interfaces. The eight 16Gb optical interfaces can use 16G FC SFP+Fibre Channel optical modules.

ACC active copper cable uses chips to compensate for the high frequency S21 loss of the passive copper cable DAC, so the transmission distance is extended to several meters. Compared with active optical cable AOC and optical module, ACC active copper cable has the advantages of low cost, low power consumption, small temperature change and transparent protocol, which can meet the energy saving and cost control requirements of large data centers.

The transmission rate and package types supported by ACC active copper cables are 10G SFP+, 25G SFP28, 40G QSFP+, 50G QSFP+, 100G QSFP28, and 200G QSFP-DD. Among them, the maximum transmission distance of 10G/25G ACC active copper cables can reach 15m, and the maximum transmission distance of 40G/50G/100/200G ACC active copper cables can reach 7m.