Dell EMC NVDIMM-N Persistent Memory User Guide

Backup to Flash

In the event of a server shutdown, cold reboot, or power loss, a Save signal is sent to the NVDIMM-N Controller which then triggers the NVDIMM-N Controller to backup all its DRAM contents to its onboard flash storage. The NVDIMM-N Save event is triggered anytime the server is about to power down and power loss to NVDIMM-Ns is imminent. The backup process takes approximately one minute to complete. This duration is independent of the number of NVDIMM-Ns installed in the server because Saves occur in parallel across all NVDIMM-Ns.

A Battery provides backup power to the NVDIMM-N so that it can complete the backup operation even after an power loss. When the Save operation is complete, the Battery is deactivated to allow the server and NVDIMM-Ns to power down completely.