User's Manual

Power Management 199
• The redundancy policy
• The capabilities and maximum efficiency point of the PSU configuration
To maintain optimal efficiency, the CMC uses this information to determine
how many PSUs are required to power a given configuration and place excess
PSUs on standby. If new modules are installed, the CMC may, depending on
need and optimization, turn on new supplies.
Redundancy Policies
The redundancy policy is a configurable set of properties that determine how
the CMC manages power to the chassis. The following redundancy policies
are configurable with or without dynamic PSU engagement:
• AC Redundancy
• Power Supply Redundancy
• No Redundancy
You can select and configure a redundancy policy or use the default
redundancy policy for your chassis. The default redundancy configuration for
your chassis depends on how many PSUs are configured for it, as shown in
Ta b le 8 -2 .
Table 8-1. Power Allocation in Compute vs. Non-compute Modules
Modules Power Budget Allocation Compute versus Non-
compute
Servers Dynamic Compute
iDRAC on servers Dynamic Compute
IOMs Dynamic Non-compute
Primary CMC Pre-allocated Non-compute
Standby CMC Pre-allocated Non-compute
iKVM Pre-allocated Non-compute
Front Panel LCD Pre-allocated Non-compute
Fans Pre-allocated Non-compute