3PAR InForm® OS 2.3.1 Messages and Operator's Guide (320-200181 Rev B, February 2010)

7.15
Using the Component LEDs
InForm OS Version 2.3.1 Messages and Operator’s Guide
Consult Table 7-6 to verify proper operation of the power supplies.
7.1.7 Battery Backup Unit LEDs
Depending on the configuration, storage servers with 3PAR cabinets include one or more
battery trays that hold up to four Battery Backup Units (BBUs) apiece. BBUs supply enough
power to write the cache memory to the drive inside the node in the event of a power failure.
BBUs contain two batteries, labeled
BATTERY A and BATTERY B. The BBUs also include the
following LEDs (Figure 7-8):
Table 7-6. Power Supply LED Displays
LED Appearance Meaning
Power Supply status Steady green light Indicates the power is on.
Steady amber light Indicates a power supply error.
No light Indicates a broken connection to
the AC power source.
AC Steady green light Indicates the AC is from an external
source.
No light Indicates no AC is entering from an
external source (for example, when
power is off or when using battery
power).