Dell Chassis Management Controller Version 3.10 for Dell EMC PowerEdge VRTX User's Guide

Fan Offset — A feature to provide increased cooling to the storage and PCIe regions of the chassis. This feature allows you to increase the airflow delivery to the HDDs, Shared PERC controllers, and PCIe card slots. An example usage of the Fan Offset is when you use high-power or custom PCIe cards that require more cooling than normal. The Fan Offset feature has options of Off, Low, Medium, and High. These settings correspond to a fan speed offset (increase) of 20%, 50%, and 100% of the maximum speed respectively. There are also minimum speeds setup for each option, which are 35% for Low, 65% for Medium, and 100% for High.

Using the Medium Fan Offset setting for example, increases the speed of fans 1–6 by 50% of its maximum speed. The increase is above the speed already set by the system for cooling on the basis of installed hardware configuration.

With any of the Fan Offset options enabled, the power consumption will be increased. The system will be louder with the Low offset, noticeably louder with the Medium offset, and significantly louder with the High offset. When the Fan Offset option is not enabled, the fan speeds will be reduced to the default speeds required for system cooling for the installed hardware configuration.

To set the offset feature, go to Chassis Overview > Fans > Setup . On the Advanced Fan Configurations page, in the Fan Configuration table, from the Value drop-down menu corresponding to Fan Offset , select an option appropriately.

For more information about the Fan Offset feature, see the Online Help.

racadm fanoffset [-s <off|low|medium|high>]

Enhanced Cooling Mode (ECM) — Is a feature in the CMC that allows increased cooling capacity for the servers installed within the PowerEdge VRTX chassis. Example uses for ECM are operation in a high ambient environment or using servers with high power (≥120W) CPUs installed. The increased cooling capacity is achieved by allowing the four chassis blower modules to run at a higher speed. As a result, the system power consumption and noise level may be increased when ECM is enabled.

When enabled, ECM will only increase the cooling capacity to the server slots within the chassis. It is also important to note that ECM is not designed to provide increased cooling to the servers at all times. Even with ECM enabled, the higher blower speeds will only be seen when the increased cooling is needed. Examples of this situation include high levels of server utilization or stress, and high ambient temperatures.

By default, ECM is off. When ECM is enabled, the blowers have the capability to deliver approximately 20% more airflow per blade.

To set the ECM mode, go to Chassis Overview > Fans > Setup . On the Advanced Fan Configurations page, in the Blower Configurationtable, from the Value drop-down menu corresponding to Enhanced Cooling Mode , select an option appropriately.

For more information about the ECM feature, see the Online Help.