HP Array Controller HSG V8.7 Software - Manual (Page 59)

Environmental Monitoring Unit
UltraSCSI RAID Enclosure 3–3
Caution
Some array controllers bypass the standby power mode
functionality from the PVA standby power switch. Refer to
the array controller documentation for availability of this
feature.
Note
An overtemperature condition (greater than 50°C) causes
the EMU to turn the enclosure dc power O
FF . When any
enclosure has an overtemperature condition, the cache
module data is preserved prior to turning O
FF the enclosure
dc power.
Controller Status
The master EMU monitors the state of both array controllers. If the
EMU detects a controller fault, the EMU can implement the following
actions:
• Sound an audible alarm
• Turn the EMU system fault status LED to F LASHING
• Display a controller fault code on the blower LEDs (only
displayed if the user momentarily presses the alarm control
switch)
Note
An error on the EMU-array controller communications path
might also cause a controller fault indication.