TABLE 14
Power supply LEDs (continued)
LED
Desired State
Meaning
Abnormal State
Meaning or Action
ALM
OFF
No alarms present and the
power supply is in normal
operating condition.
Amber
There is an alarm present
and the power supply is
malfunctioning.
Verify the AC or DC input
and DC output voltages.
About redundant power supplies and power supply failure
A FastIron device with redundant power supplies can maintain full operation when one or more power supplies fail. Power supply failure
can be a failure of the supply itself or the office power grid connected to the power supply.
A FastIron device can be either 1 + 1 redundant or N + 1 redundant. 1 + 1 redundancy implies that for every power supply, there is
another redundant (backup) power supply. In other words, half of the supplies in the system can fail, and the system will still operate
normally. N + 1 redundancy implies that there is one redundant power supply for N power supplies, where N is a number greater than
one. For example, 3 + 1 redundancy means that in a system with four power supplies, the system will continue to operate normally if one
power supply fails, but will not operate if more than one power supplies fail.
Power consumption is equally distributed (within a certain percentage depending on power load or power supply type) among all power
supplies in the system. When a power supply fails, the power load is redistributed equally among the remaining power supplies. Power
consumption between PoE and system power supplies is not shared, meaning loss of a system power supply does not impact a PoE
power supply, and vice versa.
When one or more system power supplies fail
If one or more system power supplies fail and the system is left with less than the minimum number of power supplies required for
normal operation, the power supplies will go into overload and the system will start to shut down. Several things can happen. The output
voltage of the remaining good power supplies will likely drop as they try unsuccessfully to generate more power than they are capable of.
The system will react to a drop in voltage by increasing the current draw. The hardware will shut down due to over-current protection or
under-voltage protection, whichever takes place first. One by one, the interface modules will shut down until the power is within the power
budget of the remaining power supplies. There is no particular order in which the interface modules will shut down, as this will occur in
hardware and not in software. The management CPU requires power as well, and may also shut down during a power supply failure.
After a power loss, if the system is left with less than the minimum number of power supplies required for normal operation, the system
will be left in an unknown state. At this point, manual recovery is required (i.e., restore power and power cycle the device).
When one or more PoE power supplies fail
If one or more PoE power supplies fail and the system is left with less than the minimum number of PoE power supplies, the PoE power
supplies will go into overload. Non-PoE functions will not be impacted, provided the System power supplies are still up and running.
Several things can happen with a PoE power supply failure. The output voltage of the remaining good power supplies will likely drop as
they try unsuccessfully to generate more power than they are capable of. The system will react to a drop in voltage by increasing the
current draw. The hardware will shut down PoE function due to over-current protection or under-voltage protection, whichever occurs
first. The interface modules will start to shut down its PoE ports one by one until the over-power is within the power budget of the
remaining power supplies. There is no particular order in which the PoE ports will shut down, as this occurs in hardware and not in
software.
After a power loss, if the system is left with less than the minimum number of power supplies required for normal operation, the system
will be left in an unknown state. At this point, manual recovery is required (i.e., restore power and power cycle the device).
Hardware components
Brocade FastIron SX Series Chassis Hardware Installation Guide
42
Part Number: 53-1003613-04
Summary of Contents for FastIron SX
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