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Dell EMC PowerEdge MX7000 Enclosure Installation and Service Manual

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PSU redundancy and population rules

The number of PSUs required depends on the enclosure configuration and redundancy required. The minimum requirement is two PSUs. The enclosure supports one of the following redundancy modes:
  • No redundancy: This mode distributes the enclosure power load across all PSUs. There are no specific PSU population requirements for No redundancy. The intent of this mode is to have the highest possible limit for power enablement of devices that are added to the enclosure. If there are single or multiple PSU failures, then the enclosure limits performance to operate within the power capabilities of the remaining PSUs.
  • Grid redundancy: This mode distributes the enclosure power load across all PSUs. The six PSUs are organized into two groups: Grid A consisting of PSUs 1, 2, 3, and Grid B consists of PSUs 4, 5, 6. For grid redundancy, PSUs should be populated in the following order: 1, 4, 2, 5, 3, 6. The grid with the largest PSU capacity determines the limit for power enablement of devices that are added to the enclosure. If there is a grid or PSU failure, then the enclosure power is distributed among the remaining PSUs with the intent that a single healthy grid will continue to provide power to all the components in the system which can experience varied performance depending on the workload.
  • PSU redundancy: This mode distributes the enclosure power load across all PSUs. There are no specific PSU population requirements for PSU redundancy. PSU redundancy is optimized for a population of six PSUs, and the enclosure limits the power enablement of devices to fit within five PSUs. If there is a single PSU failure, then the enclosure power is distributed among the remaining PSUs to provide power to all the components in the system which can experience varied performance depending on the workload. If there are fewer than six PSUs, then the enclosure limits the power enablement of devices to fit within all populated PSUs. If there is a single PSU failure, then the enclosure limits performance to operate within the power capabilities of the remaining PSUs.
Table 1. PSU population rulesThis table lists the PSU population rules.
PSU count Population order
2 1, 4 (Optimized for Grid Redundancy 1+1, and Hot Spare)
3 1, 4, 2
4 1, 4, 2, 5 (Optimized for Grid Redundancy 2+2, and Hot Spare)
5 1, 4, 2, 5, 3
6 1, 4, 2, 5, 3, 6 (Optimized for Grid Redundancy 3+3, PSU Redundancy 5+1, and Hot Spare)

Hot Spare: The MX7000 PSUs support the Hot Spare feature with three PSU pairs. This feature enables a PSU pair to have one active PSU and one PSU in sleep mode while the enclosure power consumption is low, and the three PSU pairs meet all the power requirements for the enclosure. This enables efficient power utilization when the overall enclosure power requirement is low. The partner PSU wakes the paired PSU from sleep mode by sending a WAKE signal when the enclosure power requirement increases. The PSU pairs for MX7000 are—1 & 4, 2 & 5, and 3 & 6.

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