Dell 2 Default Redundancy Configuration, Power Budgeting For Hardware Modules, Grid Redundancy

An increase in power demand in the Grid Redundancy configuration cause the engagement of PSUs from the Standby state. This maintains the mirrored configuration needed for dual-grid redundancy.

NOTE: With DPSE in enabled state, if power demand increases in both the two Power Redundancy policy modes, the standby PSUs are brought Online to reclaim power.

Default Redundancy Configuration

As shown in the table here, the default redundancy configuration for a chassis depends on the number of PSUs that it contains.

Table 28. Default Redundancy Configuration
PSU Configuration	Default Redundancy Policy	Default Dynamic PSU Engagement Setting
Two PSUs	DC Redundancy	Disabled
Four PSUs	DC Redundancy	Disabled

Grid Redundancy

In Grid redundancy mode with four PSUs, all four PSUs are active. The two PSUs must connect to one AC power grid, while the other two PSUs are connect to the other AC power grid.

CAUTION: To avoid a system failure, and for Grid redundancy to work effectively, there must be a balanced set of PSUs properly cabled to separate AC grids.

If one AC grid fails, the PSUs on the functioning AC grid take over, without interrupting the servers or infrastructure.

CAUTION: In Grid redundancy mode, you must have balanced sets of PSUs (at least one PSU in each grid). If this condition is not met, Grid redundancy is not possible.

Power Supply Redundancy

When power supply redundancy is enabled, a PSU in the chassis is kept as a spare, ensuring that the failure of any one PSU does not cause the servers or chassis to turn off. Power supply redundancy mode requires minimum two PSUs. Additional PSUs, if present, are utilized to improve power efficiency of the system if DPSE is enabled. Subsequent failures after loss of redundancy may cause the servers in the chassis to turn off.

Power Budgeting For Hardware Modules

CMC offers a power budgeting service that allows you to configure power budget, redundancy, and dynamic power for the chassis.

The power management service enables optimization of power consumption and reallocation of power to different modules on the basis of demand.

CMC maintains a power budget for the enclosure that reserves the necessary wattage for all installed servers and components.

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