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Dell EMC NVDIMM-N Persistent Memory User Guide


In order for NVDIMM-N data to persist across server power cycles, the NVDIMM-N must save its DRAM data to on boardflash. The Save is triggered by events that would result in power loss to the NVDIMM-N. In MX7000, the entire chassis is shutdown when there is a loss of power and at least one NVDIMM-N equipped server is powered on and armed when power loss occurs. During the Save, the server maintains power to the NVDIMM-Ns, and a battery is used to provide back-up power in case of an power loss. The server remains in a low-power reset state, and the power button on the server's front control panel blinks green once per second to indicate that a save is in progress. The Save takes approximately 1 minute to complete with the 16GB NVDIMM-N DIMMs (140 seconds for MX740c and MX840c servers).

Figure 1. R740 Control Panel
This image shows R740 Control Panel

Once the Save completes, the server continues its normal power down sequencing. If the Power Button is pressed (to request server power on) while a SAVE in progress, the server will queue the power-on to occur after the Save.

NOTE:When NVDIMMs are installed, verify that the Server is completely powered down before attempting to perform any service actions. This includes removing a server from a modular chassis after initiating a shutdown procedure. If a server equipped with NVDIMMs is removed from a modular chassis prior to the save completing, the save will be interrupted and data loss will occur. The server is completely powered down when all LEDs including NVDIMM-N and NVDIMM-N Battery LEDs are off.
NOTE: If a Modular server supporting NVDIMM-N is powered on, the entire chassis will be shutdown when there is a full loss of power or partial loss below minimum chassis power budget requirements.

Users cannot see these LEDs without removing the cover which they should not do during operation. User action is to wait until the LED on front of the system stops blinking.

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