Optimal reduction of acoustic noise in a BladeCenter server system
Original Publication Date: 2004-Dec-14
Included in the Prior Art Database: 2004-Dec-14
The present invention divides a system of server blades into air-flow domains and operates on each domain according to the optimal fan speed algorithm specified below. The algorithm automatically accounts for environmental variables such as humidity or elevation. Optimized fan speeds produce lower acoustic noise and reduced power requirements of the system. The optimal fan speed algorithm is a control loop that seeks to provide rapid cooling to the server blades when a temperature increase is sensed and drives to a stable, predetermined target temperature. The target temperature is defined by the manufacturer of the component such that the temperature may be maintained indefinitely without sustaining damage to the part. The control loop must provide stability in the sense that the fan speeds will come to steady state after a temperature step has been encountered in the air-flow domain. An improper implementation of the algorithm may result in fan speeds oscillating between minimum and maximum values.