Power Mode Configuration Guidelines - Cisco Nexus 9508 Hardware Installation Manual

Managing the Switch
Power-supply (n+1) redundancy mode
Input-source (grid n+n ) redundancy mode

Power Mode Configuration Guidelines

The amounts of available and reserve power depend on the power redundancy mode that you specify and the
number of power supplies installed in the switch. For each redundancy mode, consider the following:
OL-30837-01
This mode allocates one power supply as a reserve power supply in case an available power supply
fails. The remaining power supplies are allocated for available power. The reserve power supply must
be at least as powerful as each power supply used for the available power.
For example, if a switch requires 2.0 kW of available power and the switch has two power supplies
that each output 3 kW, then one of the power supplies provides 3.0 kW of available power and one
power supply provides 3.0 kW of reserve power in case the other power supply fails.
This mode allocates half of the power to available power and the other half to reserve power. You must
use a different power source for the active and reserve power sources so that if the power source used
for active power fails, the other power source used for the reserve power can provide power for the
switch.
For example, if the switch requires 4.0 kW of power, the switch has four power supplies that each
output 3 kW. If you have two power grids, you use grid A to power two 3-kW power supplies that
provide the available power for the switch and you use grid B to power the other two 3-kW power
supplies that provide the reserve power in case grid A fails.
Cisco Nexus 9508 Switch Site Preparation and Hardware Installation Guide
Power Mode Configuration Guidelines
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