Dell Olympus O-T600 Installation And Service Manual

Hot spare featureYour system supports the hot spare feature that significantly reduces the power overhead associated with power supply unit(PSU) redundancy.When the hot spare feature is enabled, one of the redundant PSUs is switched to the sleep state. The active PSU supports 100percent of the system load, thus operating at higher efficiency. The PSU in the sleep state monitors output voltage of the activePSU. If the output voltage of the active PSU drops, the PSU in the sleep state returns to an active output state.If having both PSUs active is more efficient than having one PSU in the sleep state, the active PSU can also activate thesleeping PSU.The default PSU settings are as follows:● If the load on the active PSU is more than 50 percent of PSU rated power wattage, then the redundant PSU is switched tothe active state.● If the load on the active PSU falls below 20 percent of PSU rated power wattage, then the redundant PSU is switched tothe sleep state.You can configure the hot spare feature by using the iDRAC settings. For more information, see the iDRAC User’s Guideavailable at Dell.com/idracmanuals.Removing a power supply unit blankPrerequisitesFollow the safety guidelines listed in Safety instructions on page 27.StepsIf you are installing a second power supply unit, remove the power supply unit blank in the bay by pulling the blank outward.CAUTION: To ensure proper system cooling, the power supply unit blank must be installed in the second powersupply unit bay in a non-redundant configuration. Remove the power supply unit blank only if you are installing asecond power supply unit.Figure 36. Removing a power supply unit blankNext steps1. Install the power supply unit blank.Installing a power supply unit blankPrerequisites1. Follow the safety guidelines listed in Safety instructions on page 27.NOTE: Install the power supply unit (PSU) blank only in the second PSU bay.44 Installing and removing system components