Understanding Power Supply Management; Initial System Boot-Up - Extreme Networks ExtremeWare XOS Guide Manual

Understanding Power Supply Management

ExtremeWare XOS monitors and manages power consumption on the switch by periodically checking
the power supply units (PSUs) and testing them for failures. To determine the health of the PSU,
ExtremeWare XOS checks the voltage, current, and temperature of the PSU. The power management
capability of ExtremeWare XOS:
Monitors all installed PSUs
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Powers up or down I/O modules based on available power and required power resources
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The switch includes two power supply controllers that collect data from the installed power supplies
and report the results to the MSM modules. When you first power on the switch, the power supply
controllers enable a power supply. As part of the power management function, the power controller
disables the PSU if an unsafe condition arises. For more information about the power supply controller,
see the Extreme Networks Consolidated XOS Hardware Installation Guide.
If you have an Aspen Power over Ethernet (PoE) G48P module installed in the Aspen 8810 switch, there
are specific power budget requirements and configurations associated with PoE that are not described
in this section. For more detailed information about PoE, see

Initial System Boot-Up

When ExtremeWare XOS boots up, it reads and analyzes the installed I/O modules. ExtremeWare XOS
considers the I/O modules for power up from the lowest numbered slot to the highest numbered slot,
based on their power requirements and the available system power. If the system does not have enough
power, some I/O modules are not powered up. For example, ExtremeWare XOS:
Collects information about the PSUs installed to determine how many are running and how much
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power each can supply.
Checks for PSU failures.
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Calculates the number of I/O modules to power up based on the available power budget and the
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power requirements of each I/O module, including PoE requirements for the Aspen PoE I/O
module.
Reserves the amount of power required to power up a second MSM if only one MSM is installed.
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Reserves the amount of power required to power all fans and chassis components.
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Calculates the current power surplus or shortfall.
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Logs transitions in the overall system power status, including whether the available amount of
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power is:
Redundant, or N+1—Power from a single PSU can be lost and no I/O modules are powered
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down.
Sufficient, but not redundant—Power from a single PSU is lost, and one or more I/O modules re
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powered down.
Insufficient—One or more modules are not powered up due to a shortfall of available power.
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By reading the PSU information, ExtremeWare XOS determines the power status and the total amount
of power available to the system. The total power available determines how many and which types of
I/O modules can be powered up.
ExtremeWare XOS 11.1 Concepts Guide

Understanding Power Supply Management

Chapter 6, "Power Over Ethernet."
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