Dell PowerEdge R740 EMC NVDIMM-N Persistent Memory User Guide - Page 30

Automatic Shutdown and Save - power consumption

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hold up the server until Battery power takes over. Once BIOS verifies that both the Battery and PSUs have enough power to support NVDIMM-Ns, BIOS arms the NVDIMM-Ns and allows the server to boot to OS. If BIOS detects any issues, BIOS will display an F1/F2 error message on screen and lock the NVDIMM-N in Read-Only mode. OSes will still be able to read NVDIMM-N data at this time, but any changes will be discarded. To restore the NVDIMM-N to normal operation, the user must correct the issue and reboot the server. Please refer to Section BIOS Error Messages 4.2 BIOS Error Messages for more details. Automatic Shutdown and Save A primary goal for DellEMC's NVDIMM-N Persistent Memory Solution is to protect customer data. A key ingredient in the data protection is the server's Power Supply. The PSU(s) must have sufficient hold-up power for the Save process to start and for the server to transition to the NVDIMM-N Backup Battery. Any changes to the server hardware configuration due to hot add/remove of devices or PSU failures will result in a server power budget re-evaluation. If in the case where the power budget exceeds the PSU's ability to hold-up power, the server will immediately shutdown to trigger a Save on the NVDIMM-N and protect customer data to flash. The server will reboot. If the problem persists, BIOS will place the NVDIMM-N into Read-Only mode before booting to the OS. In a modular chassis, since power is managed at the chassis level, an power loss event or removal of PSUs resulting in power demand exceeding available capacity will trigger an entire chassis shutdown if there are NVDIMM equipped sleds installed and powered on. If the chassis is power constrained, additional components will not be allowed to turn on if the power requirements of those components will push the power consumption of the chassis above the available power. Additionally, if a user elects to perform a "Virtual Reseat" of an NVDIMM equipped sled, the targeted sled will trigger a save on the NVDIMM-N, but not affect the whole chassis. 30 Server Behavior with NVDIMM-Ns

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hold up the server until Battery power takes over. Once BIOS verifies that both the Battery and PSUs have enough power to support
NVDIMM-Ns, BIOS arms the NVDIMM-Ns and allows the server to boot to OS.
If BIOS detects any issues, BIOS will display an F1/F2 error message on screen and lock the NVDIMM-N in Read-Only mode. OSes will still
be able to read NVDIMM-N data at this time, but any changes will be discarded. To restore the NVDIMM-N to normal operation, the user
must correct the issue and reboot the server. Please refer to Section BIOS Error Messages 4.2 BIOS Error Messages for more details.
Automatic Shutdown and Save
A primary goal for DellEMC’s NVDIMM-N Persistent Memory Solution is to protect customer data. A key ingredient in the data protection
is the server’s Power Supply. The PSU(s) must have sufficient hold-up power for the Save process to start and for the server to
transition to the NVDIMM-N Backup Battery.
Any changes to the server hardware configuration due to hot add/remove of devices or PSU failures will result in a server power budget
re-evaluation. If in the case where the power budget exceeds the PSU’s ability to hold-up power, the server will immediately shutdown to
trigger a Save on the NVDIMM-N and protect customer data to flash. The server will reboot. If the problem persists, BIOS will place the
NVDIMM-N into Read-Only mode before booting to the OS.
In a modular chassis, since power is managed at the chassis level, an power loss event or removal of PSUs resulting in power demand
exceeding available capacity will trigger an entire chassis shutdown if there are NVDIMM equipped sleds installed and powered on. If the
chassis is power constrained, additional components will not be allowed to turn on if the power requirements of those components will
push the power consumption of the chassis above the available power. Additionally, if a user elects to perform a "Virtual Reseat" of an
NVDIMM equipped sled, the targeted sled will trigger a save on the NVDIMM-N, but not affect the whole chassis.
30
Server Behavior with NVDIMM-Ns