Acoustic Mode - IBM NeXtScale System Planning And Implementation Manual

3.8.5 Acoustic mode

By using acoustic mode, the user has some control over the fan speeds and
airflow (and noise) that is produced by the system fans. This mode can be used
for noise or airflow concerns in the user environment.
When the option is set to Off, the fan speeds change as required for optimal
cooling.
When the option is set to On, the chassis offers the following set points where the
fan speeds are capped:
1: highest acoustics attenuation (lowest cooling)
2: intermediate acoustics attenuation
3: low acoustics attenuation (higher cooling).
As a result, these settings increase the possibility that the node might have to be
throttled to maintain cooling within the fan speed limitation.
The acoustic mode setting should be balanced with the customer's workload for
best performance.
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IBM NeXtScale System Planning and Implementation Guide