Users Guide

Grid Redundancy policy
The Grid Redundancy policy is also knows as 1+1 policy, for one active and one spare PSU.
The purpose of the Grid Redundancy policy is to enable an enclosure system to operate in a mode in which the enclosure can
tolerate AC power failures. These failures may originate in the AC power grid, the cabling and delivery, or a Power Supply Unit
(PSU) itself. When you configure a system for Grid Redundancy, connect PSUs 1 and 2 to separate power grids.
In this mode, the CMC ensures that power usage is maintained such that the system continues to operate with no degradation
if there is a failure of either the grid or a single PSU. Server power-on is limited to the available power of a single PSU. If at any
time redundancy cannot be maintained (such as if a PSU is removed or fails) alerts are triggered, the chassis health becomes
Critical.
No Redundancy policy
The No Redundancy policy is also known as 2+0 policy.
In this mode, all the power of both PSUs is available and used, but there is no assurance that a PSU or grid failure does not
affect system operation.
Redundancy Alerting Only policy
The Redundancy Alerting Only policy permits server power-on to use the capacity of both PSUs, while alerting on actual
conditions such as removal or failure of a PSU, or actual power consumption exceeding the capabilities of a single PSU. This is
the default policy.
Fault Tolerant Redundancy
This policy uses the power capacity limits of a Single Power Supply Unit (PSU) similar to the Grid Redundancy policy. In this
mode, the sub-system peak power of the CPU is replaced with a new IccMax limit. This policy is applicable only to Dell's 14th
generation of blade servers.
PSU failures
PSU failures of any type are always alerted, regardless of the selected redundancy policy.
Default Redundancy configuration
Redundancy Alerting Only is the default redundancy configuration for a chassis and two PSUs.
Multi-node sled adaptation
The PowerEdge FM120x4 is a multi-node, half-width sled that can accommodate four servers with the associated iDRAC with
independent processors. It is designed for optimal power efficiency and the processors cannot be removed. The processors in
PowerEdge FM120 share a common power infrastructure, for example, a single power and temperature sensors for the entire
sled.
Chassis power limit monitoring
OpenManage Power Center (OMPC) can be used to monitor and control power consumption of the machines in a data center.
PowerEdge FX2/FX2s enables OMPC by providing a provision to set the power cap for the chassis, and bounds to guide the
setting of the power cap. The lower and upper bounds for the power cap are set by the CMC and cannot be configured.
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Managing and monitoring power