5. Unlatch the latch release lock and slide the DR Series system cover back and away to gain entry to the applianceinternal components.To gain entry to the interior of the DR Series system, remove the cover. For more information, see the procedures intheDell DR Series System Owner’s Manual.6. Remove and replace the system hardware components as needed.7. Replace the cover, reconnect the system power cables to the electrical power outlet.8. Power on the DR Series system by pressing the power-on indicator/power button.DR Series System NVRAMNVRAM is a field replaceable unit (FRU) in the DR Series system. The super capacitor that powers the NVRAM double-data rate (DDR) memory must be able to move its contents to the solid-state drive (SSD) during a power loss.This data transfer requires maintaining the power to run the system for 3 minutes of operation (normally, it only takesapproximately one minute). If a problem occurs during the data backup to the SSD, the subsequent system rebootdetects this. NVRAM can experience backup failure when the following occurs:• The NVRAM failed to backup the data during the power shutdown• The super capacitor did not maintain sufficient power to backup the DDR contents into the SSD.• The NVRAM/SSD encountered an end-of-line (EOL) or another error.If any of these conditions occur, the NVRAM requires either a failure recovery or a replacement.NOTE: Dell recommends the following supported method for flushing DR Series system data from the NVRAM tothe RAID6 before replacing the NVRAM by using either of the following DR Series system CLI commands: system--shutdown or system --reboot.NOTE: If you need to remove or replace the NVRAM in the DR Series system, see Shutting Down the DR SeriesSystem and NVRAM Field Replacement.NVRAM Backup Failure RecoveryAfter you have physically replaced the NVRAM card in a PCIe x4 (or x8) slot in the DR Series system chassis, you canrecover from an NVRAM backup failure by completing the following tasks:CAUTION: You must wait a minimum of 20 minutes after powering on the DR Series system before using the DRSeries system CLI maintenance --hardware --reinit_nvram command. This 20–minute post power-on waitingperiod allows the NVRAM card, the super capacitor calibration, and all solid state drive (SSD) processes to fullycomplete, which are necessary for the proper operation of the DR Series system.During Maintenance mode, the DR Series system determines, detects, and repairs the data loss. During the systemreboot process, it ensures that no valuable data remains on the NVRAM.1. Enter the following DR Series system CLI command: maintenance --hardware --reinit_nvram.This formats the SSD and clears all of the backup and restore logs, by reinitializing the NVRAM.2. Verify that the DR Series system enters its Maintenance mode.For more information about replacing the NVRAM, see NVRAM Field Replacement and DR Series System: ProperShut Down and Start Up.NVRAM Field ReplacementWhenever the DR Series system NVRAM is replaced in the field, you must observe this best practice procedure:129
