Grid Redundancy Policy; No Redundancy Policy; Redundancy Alerting Only Policy (Default Setting); Psu Failures - Dell PowerEdge FX2 User Manual

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 (Default setting)

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.

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.
NOTE: The lower bound is the minimum power needed to operate the chassis given the current configuration. The upper
bound reflects the maximum power available in the current redundancy policy.
NOTE: If the Maximum Power Conversation Mode (MPCM) is enabled on the chassis, all power requests from a blade
server are denied. The blade server is not powered on if there is any action in the iDRAC or blade server requiring the
host to start the power cycle.

Viewing power consumption status

CMC provides the actual input power consumption for the entire system.
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