Users Guide

Power Supply and Redundancy Policy Changes in System
Event Log
Changes in the power supply state and power redundancy policy are recorded as events. Events related to the power supply that record
entries in the system event log (SEL) are power supply insertion and removal, power supply input insertion and removal, and power supply
output assertion and de-assertion.
The following table lists the SEL entries that are related to power supply changes:
Table 32. SEL Events for Power Supply Changes
Power Supply Event System Event Log (SEL) Entry
Insertion Power supply is present.
Removal Power supply is absent.
AC input received The power input for power supply has been restored.
AC input lost The power input for power supply is lost.
DC output produced Power supply is operating normally.
DC output lost Power supply failed.
Events related to changes in the power redundancy status that record entries in the SEL are redundancy loss and redundancy regain for
the modular enclosure that is configured for either an Grid Redundancy power policy or Power Supply Redundancy power policy. The
following table lists the SEL entries that are related to power redundancy policy changes.
Power Policy Event
System Event Log (SEL) Entry
Redundancy lost Power supply redundancy is lost.
Redundancy regained The power supplies are redundant.
Configuring Power Budget and Redundancy
You can configure the power budget, redundancy, and dynamic power of the entire chassis (chassis, servers, I/O module, KVM, CMC, and
power supplies), which uses four power supply units (PSUs). The power management service optimizes power consumption and
reallocates power to different modules on the basis of requirement.
You can configure the following:
• System Input Power Cap
• Redundancy Policy
• Enable Dynamic Power Supply Engagement
• Disable Chassis Power Button
• Max Power Conservation Mode
• Remote Power Logging
• Remote Power Logging Interval
• Server Based Power Management
Power Conservation and Power Budget
CMC conserves power when the user-configured maximum power limit is reached. When the demand for power exceeds the user
configured System Input Power Cap, CMC reduces power to servers in reverse-priority order to free power for higher priority servers and
other modules in the chassis.
If all or multiple slots in the chassis are configured with the same priority level, CMC decreases power to servers in the order of increasing
slot number. For example, if the servers in slots 1 and 2 have the same priority level, the power for the server in slot 1 is decreased before
that of the server in slot 2.
NOTE:
You can assign a priority level to each server in the chassis assigning a number from 1 through 9 for each server.
The default priority level for all servers is 1. The lower the number, the higher the priority level.
158 Managing and Monitoring Power