3PAR InForm® OS 2.2.4 Messages and Operator's Guide (320-200119 Rev A, March 2009)

6.16
Using the Component LEDs
InForm OS Version 2.2.4
3PAR Confidential
6.1.8 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 6-9):
Table 6-7. Power Supply LED Displays
LED Appearance Meaning
Power Supply status Steady green light Indicates that 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 that the AC is from an
external source.
No light Indicates that no AC is entering
from an external source (for
example, when power is off or
when using battery power).