Dell PowerEdge R320 Technical Manual

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Contents

Dell PowerEdge R320 Technical Manual Manual pdf 29 page image

29 PowerEdge R320 Technical Guidemanagement adjusts cooling according to what the system really needs, and draws lower fanpower draw and generates lower acoustical noise levels than servers without such controls.• User-configurable settings: An R320 thermal control design target is to minimize thecontribution of fan power to overall system power. However, with the understanding andrealization that every customer has a unique set of circumstances or expectations of the system,in this generation of servers, we are introducing limited user- configurable settings in the iDRAC7BIOS setup screen. For more information, see theDell PowerEdge R320 Systems Owner’sManual on Support.Dell.com/Manuals and “Advanced Thermal Control: Optimizing acrossEnvironments and Power Goals” on Dell.com.• Fan fault tolerance: The R320 allows continuous operation with a motor failure in the system.The base configuration of the R320 has four fans. An additional fan is needed when usingredundant power supplies. The fault tolerance feature allows one motor fan to fail at a timeallowing a fan replacement within 360 hours of a fan failure.• Environmental specifications: The optimized thermal management makes the R320 reliableunder a wide range of operating environments as shown in the environmental specifications inTable 26. Many configurations are also compliant under expanded operating temperatureenvironments, but a few are not.Acoustical designThe acoustical design of the PowerEdge R320 reflects the following:• Versatility: The PowerEdge R320 saves you power draw in the data center, but it also is quietenough for the office environment in typical and minimum configurations. Compare the valuesfor LpA in Table 18 for these configurations, and note that they are lower than ambientmeasurements of typical office environments.• Adherence to Dell’s high sound quality standards: Sound quality is different from sound powerlevel and sound pressure level in that it describes how humans respond to annoyances in sound,like whistles and hums. One of the sound quality metrics in the Dell specification is prominenceratio of a tone, which is listed in Table 18.• Noise ramp and descent during bootup from power off: Fan speeds and noise levels rampduring the boot process (from power off to power on) in order to add a layer of protection forcomponent cooling in the case that the system were not to boot properly. To keep bootup asquiet as possible, the fan speed reached during bootup is limited to about half of full speed.• Noise level dependencies: If acoustics is important to you, you may want to make the followingconfiguration choices and settings for the PowerEdge R320 for quieter operation:- In the BIOS, select the power- optimized DAPC rather than performance- optimized for thesystem thermal profile- Turn hot spare feature off in PSU- Since hard drive noise is highly dependent on spindle speed, the 7200- rpm SATA hard drivewill have the quietest hard drive operationHowever, some components cause significant but not necessarily intuitive increases in loudnesswhen they are installed in the R320. Contributors to acoustical output can include:- PERC H710 mini or PERC H810