Summary: Fan noise on G100 (T4) and G500 (U3) search appliances seems higher than previous models
Cause: The cooling fans on both the G100 and G500 operate at a higher speed than previous models. Though the Google Search Appliance model G100 (T4) is comparable to Dell™ PowerEdge™ R720xd Server Model, Google has customized the hardware configuration for optimal performance. Therefore, you might notice more noise produced by the fans on these models.
Google Technical Support is not in a position to make exceptions to adjust the fan speed in these models. Google Technical Support recommends installing Google Search Appliances in a data center.
Additional Information: See Planning for Search Appliance Installation.