Cisco Nexus 9508 NX-OS User Manual

Combined mode
This mode allocates the combined power of all power supplies to active power for switch operations.
This mode does not allocate reserve power for power redundancy in case of power outages or power
supply failures. This mode is not recommended for production.
The amounts of available and reserve power depend on the power redundancy mode that you specify. The
amounts of available and reserve power also depends on the number of power supplies that are installed in
the switch. For each redundancy mode, consider the following:
n+1 redundancy mode
The power supply that outputs the most power provides the reserve power so that it can take over for
any other power supply that fails. All the other installed power supplies provide the available power.
You activate this power mode by using the power redundancy-mode ps-redundant command.
For example, if the power requirement for a switch is 5.2 kW and the switch has two 3.0-kW power
supplies outputting 3.0 kW each, consider the following power planning scenarios:
• Scenario 1—No added power supplies
One 3-kW power supply provides the reserve power and the other 3-kW power supply, also outputting
3.0 kW, provides the available power. The available power (3.0 kW) does not meet the switch
requirements of 5.2 kW, so the switch powers up except for some of its line cards.
• Scenario 2—Adding one 3-kW power supply
One 3-kW power supply, which outputs 3.0 kW, provides the reserve power and the other two 3-kW
power supplies, also outputting 3.0 kW each, provide enough power (6.0 kW) to meet the switch
requirements (5.2 kW), so the entire switch powers up.
The following table shows the results for each scenario.
ResultReserve
Power
Available
Power
Output (kW) for Power SuppliesPower
Requirement
Scenario
321
Available
power is
less than
the power
requirement
for the
switch.
You cannot
power the
entire
switch
(some of
the line
cards will
not be able
to power
up).
3.0 kW3.0 kW—3.0 kW3.0 kW5.2 kW1
Cisco Nexus 9508 NX-OS Mode Switch Hardware Installation Guide
68
Managing the Switch
Overview of Power Modes

Cisco Nexus 9508 NX-OS Specifications

General

Brand	Cisco
Model	Nexus 9508 NX-OS
Category	Switch
Language	English