No RedundancyPower in excess of what is necessary to power the chassis is available, even on a failure, to continue to power thechassis.CAUTION: The No Redundancy mode uses optimum PSUs when DPSE is enabled for the requirements of thechassis. Failure of a single PSU could cause servers to lose power and data in this mode.Power Budgeting For Hardware ModulesCMC offers a power budgeting service that allows you to configure power budget, redundancy, and dynamic power forthe chassis.The power management service enables optimization of power consumption and re-allocation of power to differentmodules based on demand.The following figure illustrates a chassis that contains a six-PSU configuration. The PSUs are numbers 1-6, starting onthe left-side of the enclosure.Figure 8. Chassis With Six-PSU ConfigurationCMC maintains a power budget for the enclosure that reserves the necessary wattage for all installed servers andcomponents.CMC allocates power to the CMC infrastructure and the servers in the chassis. CMC infrastructure consists ofcomponents in the chassis, such as fans, I/O modules, and iKVM (if present). The chassis may have up to 16 servers thatcommunicate to the chassis through the iDRAC. For more information, see theiDRAC7 User’s Guide at support.dell.com/manuals.iDRAC provides CMC with its power envelope requirements before powering up the server. The power envelopeconsists of the maximum and minimum power requirements necessary to keep the server operating. iDRAC’s initialestimate is based on its initial understanding of components in the server. After operation commences and furthercomponents are discovered, iDRAC may increase or decrease its initial power requirements.When a server is powered-up in an enclosure, the iDRAC software re-estimates the power requirements and requests asubsequent change in the power envelope.CMC grants the requested power to the server, and the allocated wattage is subtracted from the available budget. Oncethe server is granted a power request, the server's iDRAC software continuously monitors the actual power186
