Dell DR4300 DR Series System Administrator Guide - Page 108
NVRAM Backup Failure Recovery, NVRAM Field Replacement, Shutting Down the DR Series, System
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NOTE: Dell recommends the following supported method for flushing DR Series system data from the NVRAM to the 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 Series System and NVRAM Field Replacement. NVRAM Backup Failure Recovery After you have physically replaced the NVRAM card in a PCIe x4 (or x8) slot in the DR Series system chassis, you can recover 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 DR Series system CLI maintenance --hardware --reinit_nvram command. This 20-minute post power-on waiting period allows the NVRAM card, the super capacitor calibration, and all solid state drive (SSD) processes to fully complete, 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 system reboot 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: Proper Shut Down and Start Up. NVRAM Field Replacement Whenever the DR Series system NVRAM is replaced in the field, you must observe this best practice procedure: CAUTION: You must wait a minimum of 20 minutes after powering on the DR Series system before using the DR Series system CLI command: maintenance --hardware --reinit_nvram. This post power-on waiting period allows the NVRAM card, the super capacitor calibration, and the SSD processes to fully complete, which are necessary for the proper operation of the DR Series system. NOTE: For more information, see DR Series System: Proper Shut Down and Start Up. 1. Verify that the DR Series system software detects the NVRAM as being new to the system. 2. Enter the following DR Series system CLI command: maintenance --hardware --reinit_nvram. This command initializes the NVRAM, creates new partitions, and updates information used internally by the DR Series system software. 3. Verify that the DR Series system enters its Maintenance mode. If properly initialized, the DR Series system will automatically enter Maintenance mode. The filesystem checker examines every blockmap and datastore to determine how much data was lost due to the failed NVRAM. 108