Users Guide

Redundancy Status and Overall Power Health
The redundancy status is a factor in determining the overall power health. When the power redundancy
policy is set, for example, to grid redundancy and the redundancy status indicates that the system is
operating with redundancy, the overall power health is typically OK. However, if the conditions for
operating with grid redundancy cannot be met, the redundancy status is No, and the overall power health
is Critical. This is because the system is not able to operate in accordance with the configured
redundancy policy.
NOTE: CMC does not perform a pre-check of these conditions when you change the redundancy
policy to or from grid redundancy. So, configuring the redundancy policy may immediately result in
redundancy lost or a regained condition.
Power Management After PSU Failure
In the event of a PSU failure or removal, the power supplied to servers may be reduced. In extreme cases
servers could be powered off in an attempt to sustain operation. Configuring and maintaining Grid
Redundancy avoids any impact to servers for a single PSU failure.
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 16. 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 enclosure that is configured for the Grid Redundancy power policy or
Redundancy Alerting Only 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.
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