Users Guide

Table Of Contents
298 Power Monitoring and Power Management
Hardware Owner’s Manual available on the Dell Support site at
support.dell.com/manuals. For information about modifying the PCIe power
allocation, see "Viewing and Modifying PCIe Power Allocation" on page 300.
After the blade powers on, BIOS will boot and detect the actual power
consumption of the installed PCIe expansion cards. This occurs during POST.
iDRAC maintains the value used in the pre-init phase for the expansion-cards
if both cards are present. Once the updated value has been obtained based on
the currently installed PCIe cards, iDRAC combines that value with the
expansion card estimated power consumption and reports a new power value
for the overall blade. If CMC does not allocate enough power, iDRAC will
power off the blade. If CMC allocates enough power, BIOS is allowed to
continue booting and the server can start up.
For example, if 500W is the value iDRAC assumes during pre-init, this value
will be used unless you set a different value for the PCIe expansion slot
allocation. If you set a different value, this value will always be used during
pre-init. The value is preserved through AC power cycles. The input value will
then be compared to the number of cards installed when the system reaches
POST.
Viewing Power Budget
The server provides power budget status overviews of the power subsystem on the
Power Budget screen.
Using the Web Interface
NOTE: To perform power management actions, you must have Administrative
privilege.
1
Log in to iDRAC6 Web interface.
2
In the system tree, select
System
.
3
Click the
Power Management
tab, and then click
Power Budget
.
The
Power Budget
screen appears.
The Power Budget Information table displays the minimum and maximum
limits of power thresholds for the current system configuration. These cover
the range of AC power consumptions a thresholded system under heavy
workload will present to the datacenter.