Extreme Networks ExtremeWare XOS 11.3, Manual

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Understanding Power Supply Management
ExtremeWare XOS 11.3 Concepts Guide
79
Using Power Supplies—Modular Switches Only
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:
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Protects the system from overload conditions
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Monitors all installed PSUs, even installed PSUs that are disabled
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Enables and disables PSUs as required
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Powers up or down I/O modules based on available power and required power resources
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Logs power resource changes, including power budget, total available power, redundancy, and so on
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Detects and isolates faulty PSUs
The switch includes two power supply controllers that collect data from the installed PSUs and report
the results to the MSM modules. When you first power on the switch, the power supply controllers
enable a PSU. 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 a BlackDiamond 8800 Power over Ethernet (PoE) G48P module installed in any of the
BlackDiamond 8800 family of switches, 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
Chapter 7 , " Power Over Ethernet ."
This section describes the following power management topics:
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Initial System Boot-Up on page 79
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Power Redundancy on page 80
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Power Management Guidelines on page 80
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Overriding Automatic Power Supply Management on page 81
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:
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Collects information about the PSUs installed to determine how many are running and how much
power each can supply.
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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
power requirements of each I/O module, including PoE requirements for the BlackDiamond 8800
PoE I/O module.
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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 and sends SNMP traps for transitions in the overall system power status, including whether
the available amount of power is: