Cisco Nexus 9508 NX-OS User Manual

ResultReserve
Power
Available
Power
Output for Power SuppliesPower
Requirement
Scenario
4321
Available
power
(3.0 kW)
is less
than the
power
requirement
for the
switch
(5.2
kW)—switch
powers up
but some
of the line
cards
cannot
power up.
3.0 kW3.0 kW——3.0 kW3.0 kW5.2 kW1
Available
power
(6.0 kW)
exceeds
the power
requirement
for the
switch
(5.2
kW)—entire
switch
powers
up.
6.0 kW6.0 kW3.0 kW3.0 kW3.0 kW3.0 kW5.2 kW2
Combined mode
The Total Power Capacity equals the combined output of all installed power supplies. There is no reserve
power. You activate this mode by using the power redundancy-mode combined command. If the Total
Power Allocated (budget) for a switch is 5.2 kW and the switch has one 3-kW power supply with 220-V
input and 3.0-kW output, consider the following power planning scenarios:
• Scenario 1—No added power supplies
If you do not add a power supply unit, the available power (3.0 kW) is insufficient for the switch
power requirement of 5.2 kW. The switch powers the supervisor modules, system controllers, fan
trays, and at least one fabric module before powering as many of the fabric and line cards as the
remaining available power can support (one or more fabric or line cards might not be powered).
• Scenario 2—Install an extra 3-kW power supply
If you install an extra 3-kW power supply unit that can output 3.0 kW, the available power becomes
6.0 kW. The increased amount of available power exceeds the switch power requirement of 5.2 kW,
so all the modules and fan trays in the switch can power up.
Cisco Nexus 9508 NX-OS Mode Switch Hardware Installation Guide
70
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