Abstract: A rack having a plurality of fans and a plurality of servers divided into several groups is presented. Each of the servers calculates fan speed needed for heat dissipating based on internal temperatures, and outputs the calculated fan speed to the fans in same group respectively. The fans in the same group run according to the received fan speed. A rack management controller (RMC) in the rack obtains the fan speed outputted by a server in one of the several groups, and calculates a fan speed compensating value based on the obtained fan speed. The RMC then outputs the fan speed compensating value to fans in neighboring groups to make it to run according to the fan speed compensating value.

Abstract: A rack comprising a control module and a plurality of nodes is present. The control module comprises a rack management controller (RMC), and each of the plurality of nodes comprises a baseboard management controller (BMC). The RMC communicates with the BMCs respectively through a plurality of default communication channels, and the RMC controls the nodes and transmits necessary data thereto through the BMCs. When losing response signal from one of the BMCs, the RMC resends same signal to the non-responded BMC. If a resend threshold is achieved, the RMC sends a control signal to a reset pin of the non-responded BMC directly through a GPIO channel to force the non-responded BMC to reset.