Users Guide

NOTE: The CMC monitors the temperature sensors in the chassis and automatically adjust the fan speed as needed. However,

you can override to maintain a minimum fan speed by the racadm fanoset command. When overriden using this command, the

CMC will always run the fan to the selected speed even though the chassis does not require the fans to run at that speed.

CMC generates an alert and increases the fan speeds when the following events occur:

• CMC ambient temperature threshold is exceeded.

• A fan stops functioning.

• A fan is removed from the chassis.

NOTE: During updates of CMC or iDRAC rmware on a server, some or all of the fan units in the chassis rotates at 100%. This is

normal.

To view the health status of fans, in the CMC Web interface, do any of the following:

1 Go to Chassis Overview.

The Chassis Health page is displayed. The lower section of chassis graphics provides the left view of the chassis and contains the

health status of the fans. Fan health status is indicated by the overlay of the fan sub-graphic. Move the cursor over the fan sub-

graphic. The text hint provides additional information about a fan. Click the fan subgraphic to view the fan information in the right

pane.

2 Go to Chassis Overview > Fans.

The Fans Status page provides the status, speed measurements in revolutions per minute (RPMs), and threshold values of the fans in

the chassis. There can be one or more fans.

NOTE: In the event of a communication failure between CMC and the fan unit, CMC cannot obtain or display the health

status for the fan unit.

NOTE: The following message is displayed when both the fans are not present in the slots or if a fan is rotating at a low

speed:

Fan <number> is less than the lower critical threshold.

For more information, see the Online Help.

Conguring Fans

Fan Oset — A feature to provide increased cooling to the storage and PCIe regions of the chassis. This feature allows you to increase the

airow delivery to the HDDs, Shared PERC controllers, and PCIe card slots. An example usage of the Fan Oset is when you use high-

power or custom PCIe cards that require more cooling than normal. The Fan Oset feature has options of O, Low, Medium, and High.

These settings correspond to a fan speed oset (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 Oset 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 conguration.

With any of the Fan Oset options enabled, the power consumption will be increased. The system will be louder with the Low oset,

noticeably louder with the Medium oset, and signicantly louder with the High oset. When the Fan Oset option is not enabled, the fan

speeds will be reduced to the default speeds required for system cooling for the installed hardware conguration.

To set the oset feature, go to Chassis Overview > Fans > Setup. On the Advanced Fan Congurations page, in the Fan Conguration

table, from the Value drop-down menu corresponding to Fan Oset, select an option appropriately.

For more information about the Fan Oset feature, see the Online Help.

For setting up these features by using RACADM commands, user the following command:

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

Viewing Chassis Information and Monitoring Chassis and Component Health