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Method for optimizing integral cooling against individual cooling in rack based infrastructures

IP.com Disclosure Number: IPCOM000238329D
Publication Date: 2014-Aug-18
Document File: 4 page(s) / 31K

Publishing Venue

The IP.com Prior Art Database

Abstract

Disclosed is a method and system to improve the efficiency of fan subsystems in chassis-node based servers. Regardless of the zonal configuration and fan availability, the fan and thermal system enables the fans to attend to the individual needs of each slot or a group of slots, and based on the presence and condition of the node, the fan subsystem operates either in integrated mode or in standalone mode.

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Method for optimizing integral cooling against individual cooling in rack based infrastructures

Current blade architecture propagates base fan speed requirements during power-on and then monitors for any heat event within the plugged in nodes. Upon the detection of a heat event, the system conveys the additional cooling requirement to the chassis for effective cooling requirement. The cooling requirements are adaptive to a zone, where certain blades are grouped and controlled from the central management console.

In a blade architecture based system, the Chassis Management Model (CMM) controls the fans present in the chassis. Each Information Technology Element (ITE) communicates a Current Cooling Value (CCSV) and each blade conveys a minimum, maximum, and current CCSV to the CMM. The CMM adjusts the fan speed based on the current cooling requirement.

During the start, when all of the systems are in standby (i.e. systems can communicate and the blades are not powered on yet), there is no requirement for the fan subsystem to be running. Therefore, in standby mode, all fans are running at minimum speed even if only one or slots are populated in the chassis.

One drawback of the current system is that the zone is maintained based on the maximum cooling requirement for that zone, which causes the fans to run at a higher speed and burn more power. If any of the nodes in that particular zone becomes heated due to a workload, then all the fans in the same zone go to maximum power as specified by the hot blade. A method is needed to improve the efficiency of a fan subsystem in node-based servers.

The novel contribution is a method and system to improve the efficiency of fan subsystems in chassis-node based servers by balancing the standalone fan control system with the chassis based integrated fan control mode. Immaterial of the zonal configuration and fan availability, the idea is to design a fan and thermal system in which the fans attend to the individual needs of each slot or a group of slots, and based on the presence and condition of the node, the fan subsystem operates either in integrated mode or in standalone mode.

The novel methodology allows the system to switch between standalone control and chassis/zone control. Several innovations and solutions have been identified for thermal cooling control in such an infrastructure. The method presented herein can be combined with other solutions to provide effective cooling.

The method and system employ a fan hardware infrastructure in which individual fans can attend to the node or nodes depending on the fan size and slot presence. For lower utilization scenarios when fewer nodes are populated, the system disintegrates the chassis mechanism and controls the fan for that particular node. The system provides feedback to user regarding the correct population of the nodes in the slots

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based on the possible fan use case scenario. The system changes the fan control mechanism to...