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Dell Chassis Management Controller Version 3.10 for Dell EMC PowerEdge VRTX User's Guide

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New Server Engagement Policy

If a new server that is turned on exceeds the power available for the chassis, CMC may decrease the power to the low-priority servers. This could happen if the administrator has configured a power limit for the chassis that is below what would be required for full power allocation to the servers, or if insufficient power is available in case higher power requirements by all servers in the chassis. If enough power cannot be freed by reducing the allocated power of the low-priority servers, the new server is not allowed to turn on.

This occurs if the administrator had configured power limit for the chassis lower than the full power allocation to the servers or if insufficient power is available to servers requiring high power.

The following table provides the actions taken by CMC, when a new server is powered on in the scenario described earlier.

Table 1. CMC Response When a Server Power-On is Attempted . The following table describes the CMC responses when a server power-on is attempted.
Worst Case Power is Available CMC Response Server Power On
Yes No power conservation is required Allowed
No Perform power conservation:
  • Power required for new server is available
  • Power required for new server is not available

Allowed

Not Allowed

If a PSU stops functioning, it results in a non-critical health state and a PSU failure event is generated. The removal of a PSU results in a PSU removal event.

If either event results in a loss of redundancy, on the basis of power allocations, a loss of redundancy event is generated.

If the subsequent power capacity or the user power capacity is greater than the server allocations, servers have degraded performance or, in an extrement case, servers may be turned off. Both conditions are in reverse-priority order; that is, the low-priority servers are turned off first.

The following table provides the firmware response to a PSU turnoff, or removal as it applies to various PSU redundancy configurations.

Table 2. Chassis Impact from PSU Failure or Removal . The following table describes the impact of a PSU failure or removal on the chassis.
PSU Configuration Dynamic PSU Engagement Firmware Response
Grid Redundancy Disabled CMC alerts you about loss of Grid redundancy.
Power Supply Redundancy Disabled CMC alerts you about loss of power supply redundancy.
Grid Redundancy Enabled CMC alerts you about loss of Grid Redundancy. PSUs in standby mode (if any) are turned on to compensate for power budget lost from the PSU failure or removal.
Power Supply Redundancy Enabled CMC alerts you of loss of Power Supply Redundancy. PSUs in standby mode (if any) are turned on to compensate for power budget lost from PSU failure or removal.

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