PowerEdge: M1000e Blade Power Distribution Systems

Dell PowerEdge M1000e Blade Server - Power Distribution 

Dell PG Engineering technical whitepaper for selecting and installing power systems for the Dell M1000e Blade Chassis - Power Distribution Systems for the Dell PowerEdge M1000e Modular Server Enclosure- Selection and Installation 


Below is an excerpt from the white paper describing Power Redundancy Modes for the PowerEdge M1000e.

Power Redundancy Modes for the PowerEdge M1000e

• AC Redundancy, DPSE DISABLED - In this mode, all six PSUs are active and the load is shared across all of them. Three PSUs are connected into one AC grid and three PSUs into another, ensuring that the loss of an entire AC grid or any three individual PSUs do not affect the operation of any of the blades. This is the default mode for a six PSU configuration.
• AC Redundancy, DPSE ENABLED - In this mode, all six PSUs start out active and the load is shared across all of them. When power draw stabilizes, the CMC determines how many supplies are required to power that configuration most efficiently and provide redundancy if there is a grid failure. If the load requires only two supplies to power that configuration plus two more for redundancy, then two supplies are put into standby (CMC enables them automatically if load increases see Appendix C).
• Power Supply Redundancy, DPSE DISABLED - In this mode four PSUs are active and the load is balanced across them - while the remaining two supplies (if connected to AC power) are put into standby. The PSUs in standby are made active if there is a PSU failure to any of the four active PSUs if they are connected to AC power.
• Power Supply Redundancy, DPSE ENABLED - In this mode, four PSUs start out active and the load is shared across all of them - while the remaining two supplies (if connected to AC power) are put into standby. When power draw stabilizes, the CMC determines how many are required to power that configuration most efficiently while providing redundancy if there is a PSU failure. If the load requires only two PSUs to power that configuration plus one more for redundancy, then one additional supply is put into standby (the CMC enables it automatically if the load increases). The PSUs in standby are made active if there is a PSU failure to any of the four active supplies if they are connected to AC power. For more details on DPSE, see Appendix C.
• Non‐Redundant, DPSE DISABLED - In this mode with six PSUs present and connected to AC power, three PSUs are active and three are put into standby. With only three PSUs supplies present, all three are active. A failure to any power supply in this configuration may result in some blades shutting down if the load requires the capacity of all three PSUs.
• Non-Redundant, DPSE ENABLED‐ In this mode with six PSUs present, three PSUs start out active (3+0) and the load is balanced across them while three PSUs are in standby. When the power draw stabilizes, the CMC determines how many supplies are required to power that configuration most efficiently with no provision for redundancy. If the load requires only two PSUs to power that configuration, then one additional PSU (four in total) is put into standby. The CMC enables it automatically if load increases. A failure to any power supply or AC grid may result in some blades shutting down.