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

7.27
Using the Component LEDs
InForm OS Version 2.2.4
3PAR Confidential
Consult Table 7-12 on page 7.27 to verify proper operation of the power supplies.
7.1.8 Battery Backup Unit LEDs
Depending on the configuration, the InServ S-Class Storage Servers 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 7-16):
Table 7-12. Power Supply LED Displays
LED Appearance Meaning
Power supply
status
Steady green light Indicates power is on.
Steady amber
light
Indicates power supply error.
No light Indicates a broken connection to the power source.
AC Steady green light Indicates AC is entering 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).