Technical Product Specification

Intel® Server System SR2625UR TPS Cooling Subsystem

Revision 1.8 Intel order number E46130-010

4. Cooling Subsystem

Several components and configuration requirements make up the cooling subsystem of the

system. These include the system fan module, the power supply fans, air baffles, CPU air duct,

and drive bay population. All are necessary to provide and regulate the airflow and air pressure

needed to maintain the system’s thermals when operating at or below maximum specified

thermal limits. For details, see Table 56 on page 88.

Two system fan assembly options are available for this system:

 The first option is a non-redundant three fan solution providing sufficient airflow to

maintain internal system thermal requirements when the external ambient temperature

remains within specified limits.

 The second option is a redundant fan solution. Three parallel sets of fans are arranged

in series to provide redundant cooling in the event of a single fan failure. Each cooling

option utilizes two fan types: a 60-mm variable-speed fan and an 80-mm

variable-speed fan.

The system uses a variable fan speed control engine to provide adequate cooling for the

system at various ambient temperature conditions, under various server workloads, and with

the least amount of acoustic noise possible. To minimize acoustics, the fans operate at the

lowest speed for any given condition.

The Integrated Baseboard Management Controller (Integrated BMC) on the Intel

Server Board

S5520UR is used for the variable fan speed control function. The Integrated BMC monitors

selective component temperatures, the ambient temperature, and each fan’s RPM to determine

the necessary airflow. The Integrated BMC sets the fan speeds to the appropriate RPM to

maintain proper cooling. The Integrated BMC also logs errors into the System Event Log (SEL)

when temperature sensors exceed their safe operating ranges, or if any of the fans fail to

operate at safe airflow speeds.

If a fan fails, the Integrated BMC boosts the remaining fans to compensate for the lost airflow. A

system with redundant fans can continue to operate in this degraded condition while the non-

redundant system may not. If the cooling is not sufficient under a failed fan condition, the

system eventually shuts down to protect its primary components from thermal damage.

Additionally, this fan boost causes additional vibration in this system. Some hard drives are very

susceptible to vibration. For additional details, see Section 4.5.