Dell PowerEdge M1000e Chassis Management Controller Firmware Version 5.1 User’s Guide

To configure Grid Redundancy, at least one PSU must be present in each grid. Additional configurations are possible with every combination that has at least one PSU in each grid. However, to make the maximum power available for use, the total power of the PSUs in each grid should be as close to equal as practical. The upper limit of power while maintaining Grid Redundancy is the power available on the weakest of the two grids. The following figure illustrates 2 PSUs per grid and a power failure on grid 1.

If CMC is unable to maintain Grid Redundancy, an email or SNMP alerts are sent to administrators if the Redundancy Lost event is configured for alerting.

Figure 1. PSUs per grid and a power failure on grid 1

In the event of a single PSU failure in this configuration, the remaining PSUs in the failing grid are marked as Online. In this state, the PSUs in the Redundant Grid if not in failed state, help in functioning of the system without interruption. If a PSU fails, the chassis health is marked non-critical. If the smaller grid cannot support the total chassis power allocations, then grid redundancy status is reported as No Redundancy and Chassis health is displayed as Critical.