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Dynamic Power Capping with ambient temperature during fan fail

IP.com Disclosure Number: IPCOM000238260D
Publication Date: 2014-Aug-13
Document File: 1 page(s) / 28K

Publishing Venue

The IP.com Prior Art Database

Abstract

In the dense system, more and more drives and options are placed inside and it becomes the challenge for the thermal design. If the system supporting higher ambient temperature like 40C, the downstream components are exposed in the hot environment. In the current system supporting high ambient environment, there are the limitation to protect the downstream components. The disclosure is to utilize the existing inlet ambient sensor, CPU power reading and exhausted ambient sensor to formulate the maximum CPU power that system can survive with respect to the inlet ambient so as to get the dynamic CPU power capping.

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Dynamic Power Capping with ambient temperature during fan fail

    In the dense system, more and more drives and options are placed inside and it becomes the challenge for the thermal design. If the system supporting higher ambient temperature like 40°C, the downstream components are exposed in the hot environment. In the current system supporting high ambient environment, there are the limitation to protect the downstream components when the system fan fail which is regarded as the abnormal condition.

    The disclosure is to utilize the existing inlet ambient sensor, CPU power reading and exhausted ambient sensor to formulate the maximum CPU power that the system can survive with respect to the inlet ambient so as to get the dynamic CPU power capping. For this idea implementation, the disclosure is using the formula of CPU power, CFM, inlet ambient temperature and exhausted ambient temperature (i.e. target temperature) to determine the next power capping value according to the inlet ambient temperature where all the setting and algorithm is embedded in the BMC. When the fan failed, the system will follow the following algorithm based on the equation:

    The equation is as follow: Delta Temperature=constant *CPU power/CFM.
(1) CPU power can be obtained : Pmax=CFM*(delta Temperature)/constant.
(2) Delta Temperature = target Temperature - inlet ambient Temperature.

(3) CFM is the constant in fan fail. Therefore, the relation of Pmax vs T inlet ambient can be obtained. Owing...