Acoustics; Figure 25. Power Supply Inlet And Cooling Air Profile - Dell PowerEdge M1000e Technical Manual

Figure 25. Power supply inlet and cooling air profile

This hardware design is coupled with a thermal cooling algorithm that incorporates:

Server module level thermal monitoring by the iDRAC with Lifecycle Controller

I/O module thermal health monitors

Fan control and monitoring by the CMC
The iDRAC on each server module calculates the amount of airflow required on an individual server
module level and sends a request to the CMC. This request is based on temperature conditions on
the server module, as well as passive requirements due to hardware configuration. Concurrently,
each IOM can send a request to the CMC to increase or decrease cooling to the I/O subsystem. The
CMC interprets these requests, and can control the fans as required to maintain server and I/O
module airflow at optimal levels.

Acoustics

The M1000e is engineered for sound quality in accordance with the Dell Enterprise acoustical
specification. Compared to previous generations of products, the fans have more levels of control
and finer tuning of the fan behavior. Firmware is optimized to choose the lowest fan speeds and
therefore the lowest acoustical output for any configuration (components installed), operating
condition (applications being run), and ambient temperature. Because acoustical output is
dependent and indeed minimized for each combination of these variables, no single acoustical level
(sound pressure level or sound power level) represents the M1000e, and instead boundaries on
sound power level are provided below:

Lowest Fan Speed: Upper Limit A-weighted Sound Power Level, LwA-UL, is 7.5 bels.

Full Fan Speed: Upper Limit A-weighted Sound Power Level, LwA-UL, is 9.7 bels.

LwA-UL is the upper limit sound power level (LwA) calculated per section 4.4.2 of ISO 9296
(1988) and measured in accordance to ISO 7779 (1999).

Acoustical models have been provided to predict performance between these bounds in the Dell
Energy Smart Solution Advisor (ESSA) tool. Learn more at Dell.com/ESSA.
A few things to be aware of:

Fans are loud when running at full speed. It is rare that fans need to run at full speed. Ensure that
components are operating properly if fans remain at full speed.
PowerEdge M1000e Technical Guide
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