User's Manual

Power Management 221
Power Budgeting for Hardware Modules
The figure below illustrates a chassis that contains a six-PSU configuration.
The PSUs are numbers 1 - 6, starting on the left-side of the enclosure.
Figure 8-1. Chassis With Six-PSU Configuration
The CMC maintains a power budget for the enclosure that reserves the
necessary wattage for all installed servers and components. When a server is
powered-up in an enclosure, the iDRAC software reports the following to the
CMC:
• The maximum power the server is capable of consuming based on its
memory and CPU configuration.
• The minimum power the server should be allocated to ensure proper
operation.
The CMC will grant the server its maximum power, if available, or a value
between the maximum and minimum if not, and the allocated wattage is
subtracted from the available budget. Once the server is granted a power
request, the server's iDRAC software will monitor the actual power
PSU1 PSU2 PSU3 PSU4 PSU5 PSU6