Chapter 2 Introducing the Aruba 8325 Switch
23
Power supply status LED
Load sharing
Load sharing occurs when two power supplies are installed in the switch and turned on. Load sharing divides the
total power load of the switch among both power supplies.
Redundancy
With power redundancy, the Aruba 8325 switch can continue normal operation even when one power supply fails
or is powered off. When two power supplies are installed, if one becomes unavailable (fails, or is powered off or
removed) the remaining power supply provides full power for the device.
Hot swapping
Hot swapping allows you to replace one failed power supply while the other provides full power. This makes it
unnecessary to shut down the switch during the replacement procedure.
Fan assemblies
The Aruba 8325 switch is equipped with six field-replaceable, hot-swappable fan assemblies. Each fan assembly
features individual fans that pull air through the chassis from front to back (FB) or from back to front (BF).
Table 17:
Power supply LED behavior
Power Supply
LED
Function
State
Meaning
Status LED
To display power
supply status.
On green
The power supply is operating normally.
Flashing green or
on red
The power supply is experiencing a fault, or has
AC power but is not installed in the switch unit.
Off
AC power is not connected to the power supply
or, if AC power is connected, the power supply is
in protection mode due to a voltage, current,
thermal, or short-circuit condition.
Never insert or remove a power supply while the power cord is connected. Verify that the cord has
been disconnected from the power supply before installation or removal.
Fans and power supplies installed in a given 8325 switch must have the same cooling air flow
direction (FB or BF). Air flow direction in an 8325 switch is not controlled by software. To change the
air flow direction, replace the power supplies and fans with power and fan units supporting the air flow
direction you want. See
Figure 11 on page 22
,
Table 18 on page 24
, and
Figure 12 on page 24
.
A minimum of five fan assemblies is required for operation. The system will automatically shutdown if
overheating is detected. If five or fewer fan assemblies are installed, the Fan LED will be on amber
and the Global Status LED will flash amber to indicate a fan fault may exist.
System airflow direction (FB or BF) is configured automatically at system initialization and cannot be
reconfigured by the user. System airflow direction is determined by the power supply type installed in
PS1 at initialization time (or PS2 if PS1 is absent). Any Fan assembly or Power supply of conflicting
airflow type will be disabled by the system. Ensure only matching Fan assemblies and power supplies
are used at any given runtime.
