Owner's Manual

322 Power Management
Figure 9-4. Chassis With Six-PSU Configuration
CMC maintains a power budget for the enclosure that reserves the necessary
wattage for all installed servers and components.
CMC allocates power to the CMC infrastructure and the servers in the
chassis. CMC infrastructure consists of components in the chassis, such as
fans, I/O modules, and iKVM (if present). The chassis may have up to 16
servers that communicate to the chassis through the iDRAC. For more
information, see the iDRAC User’s Guide at support.dell.com/manuals.
iDRAC provides CMC with its power envelope requirements before powering
up the server. The power envelope consists of the maximum and minimum
power requirements necessary to keep the server operating. iDRAC’s initial
estimate is based on its initial understanding of components in the server.
After operation commences and further components are discovered, iDRAC
may increase or decrease its initial power requirements.
When a server is powered-up in an enclosure, the iDRAC software re-estimates
the power requirements and requests a subsequent change in the power
envelope.
PSU1 PSU2 PSU3 PSU4 PSU5 PSU6