HP A3550A - High Availability Disk Arrays Model 20 Storage Enclosure User Manual page 255

Table 6-2 Disk Array LEDs
LED Array condition when LED is on
Array Front Panel
Power supply units are operating
POWER-ON (green)
and providing power to the midplane
+24 VDC bus.
Array Front Panel
Disk array has detected a fault in one
FAULT (amber)
of the FRUs.
Disk Module
Disk module is operational and ready
READY (green)
to send and receive data.
Disk Module
Disk module is sending or receiving
BUSY (green)
data or is hung.
Disk Module
Disk module has encountered a fault
FAULT (amber)
and cannot be accessed.
Fan Pack
Fan pack has detected that one of
REPLACE (amber)
the fans faulted.
SP
Normal operation
READY (green)
SP
SP has just been powered on and is
SERVICE (amber)
running power-up self-tests or has
encountered a fault and no longer is
configured in the array.
Power Supply Unit
Normal operation
READY (green)
Power Supply Unit
Power supply unit has encountered a
REPLACE (amber)
fault and is no longer configured in
the array.
BBU
BBU has encountered a fault and is
REPLACE (amber)
no longer operational.
Array condition when LED is off
Disk array is powered off or, if it has
been running, has lost the +24 VDC
bus.
Normal operation
Drive is busy (if BUSY LED is on) or
has faulted (if FAULT LED is on).
Drive is ready (if READY LED is on)
or has faulted (if FAULT LED is on).
Drive is ready (if READY LED is on)
or busy (if BUSY LED is on).
Normal operation
Disk array is off, not providing power
to the +24 VDC bus, or the SP has
faulted (if SERVICE LED is on).
Normal operation
Disk array power is off (no AC power
reaching the power supply unit) or the
power supply unit has faulted (if
REPLACE LED is on).
Normal operation
Normal operation
Disk Array Chassis 6-7