Huawei E9000 Chassis Server device Temperature requirement and introduce of heat Dissipation System

    This section describes the components, heat dissipation performance, and fan module installation slots of the E9000 heat dissipation system

2.1 Introduce of heat Dissipation System

2.1.1 Fan Modules and Heat Dissipation Capability

    The heat dissipation system of the E9000 chassis consists of 14 fan modules. When the E9000 chassis is fully configured with fan modules, the maximum heat dissipation power consumption is as follows:

• Compute node slot (35°C or 95°F ambient temperature):

 Half-width slot: 900 W

 Full-width slot: 1800 W

• Compute node slot (40°C or 104°F ambient temperature):

 Half-width slot: 700 W

 Full-width slot: 1400 W

• Switch module slot: 280 W

• Management module slot: 80 W

    Figure 3 shows the installation positions and slot numbers of fan modules in the chassis.

2.1.2 Fan Module Zones

The 14 fan modules are divided into three zones. Each fan module contains two fan units. If a fan unit or module fails, heat dissipation is not affected.

Figure 1 shows the fan module zones, which are distinguished by colors.

• The pink fan zone dissipates heat for the pink front compute node zones.

• The turquoise fan zone dissipates heat for the turquoise front compute node zones.

• The orange fan zone dissipates heat for the orange rear module (management modules and switch modules) zones.

    Fan modules in the same zone run at the same speed. The speeds of the fans in the three zones are automatically adjusted so that any differences in speed do not exceed 25%.

Figure 1 Fan module zones

 

2.1.3 Ventilation Channel

Figure 2 Ventilation channels for front nodes

 

Figure 3 Ventilation channels for rear modules

 

2.2 Fan Modules

2.2.1 Function

    The E9000 provides 14 fan modules, which are divided into three zones, with each fan module containing two fan units. Each zone supports N+1 redundancy, ensuring heat dissipation is not affected if a fan unit or module fails. The E9000 chassis uses forced air cooling technology and front-to-rear ventilation channels. This ensures that the air enters the chassis from the front and exits from the rear. The fan modules automatically adjust the fan speed based on the operating temperature of compute nodes in the chassis or the management module adjusts the fan speed.

2.2.2 Appearance

Figure 1 Fan module

2.2.3 Indicator

Figure 2 Indicator on the fan module

 

Table 1 Indicator status description

 

3.1 Control Modes

Fan modules are controlled in the following three modes:

• Start mode

When fan modules are powered on, the default fan speed is 30% and lasts for 3s. When the fan module software is initialized, fan modules enter main control mode or automatic mode based on the communication status.

• Automatic mode

Before communicating with the active management module, fan modules automatically adjust the fan speed based on the temperature sensor.

• Main control mode

After communicating properly with fan modules, the active management module adjusts the fan speed based on the temperatures of the chassis and components. Fan modules do not adjust the fan speed based on their temperatures in this mode.

3.1.1 Automatic Mode

    The following describes the relationship between the fan speed and temperature (T in Figure 1 Fan speed curve) in automatic mode:

• T < 35°C (95°F): The fan speed is 25%.

• 35°C ≤ T < 65°C (149°F): The fan speed linearly changes between 25% and 100%.

• 65°C (149°F) ≤ T: The fan speed is 100%.

Figure 1 Fan speed curve

 

3.1.2 Main Control Mode

    Figure 1 shows the relationship between the fan speed and the air intake vent temperature (T) in main control mode. Other factors that affect the fan speed are not described here, such as board temperature alarms and component temperatures.

• T < 25°C (77°F): The fan speed is 25%.

• 25°C (77°F) ≤ T < 30°C (86°F): The fan speed linearly changes between 25% and 40%.

• 30°C (86°F) ≤ T < 35°C (95°F): The fan speed linearly changes between 40% and 50%.

• 35°C (95°F) ≤ T < 45°C (113°F): The fan speed linearly changes between 50% and 80%.

• 45°C (113°F) ≤ T < 55°C (131°F): The fan speed linearly changes between 80% and 100%.

• 55°C (131°F) ≤ T: The fan speed is 100%.

Figure 2 Fan speed curve

 

NOTE:

Possible causes of sudden increases in fan speed are as follows:

• Certain fan units in the fan module zone are abnormal.

• The management modules fail to obtain the temperature of the air intake vent sensor.

• The fan modules fail to communicate with the management modules.

• A board temperature alarm is generated or there are high-temperature board components in the fan module zone.

3.2 Fan Module Configuration Guidelines

    This section describes the guidelines for configuring fan modules if a chassis houses different numbers of compute nodes.

    Fan modules in the chassis must have sufficient heat dissipation capabilities to ensure that the compute nodes and the system operate properly.

Figure 1 Slot numbers of fan modules 

NOTICE:

Configure fan modules based on the following guidelines. Otherwise, compute nodes can power off due to insufficient heat dissipation.

Configure fan modules based on the following guidelines:

• If a chassis houses eight or fewer half-width compute nodes or four or fewer full-width compute nodes, install all fan modules except fan modules 5, 6, 11, and 12.

• If a chassis houses more than eight half-width compute nodes or more than four full-width compute nodes, install all fan modules.

    There are multiple temperature sensors on E9000 chassis and blade server, which monitor the change of running temperature in real time, once one sensor detects the temperature on one part has exteeded the threshold, it will generate the corresponding alarm on HMM and iBMC webUI.

    When system detect the temperature on CPU has reached the limitation of maximum, it will shutdown system automatically, meanwhile it will generate this alarm on HMM and IBMC.

 

     More alert about temperature abnormal, please refer this link: http://support.huawei.com/hedex/hdx.do?docid=EDOC1000053358&id=it_server_v3_600007_2&text=Temperature%252520Alarms&lang=en