For detailed instructions about using the set emu
commands, refer to the array controller documentation.
Compaq recommends using the
set emu fanspeed=automatic command, allowing
individual EMUs to implement corrective action if one of the
following error conditions occur:
•
A blower fails.
•
A blower is removed.
•
A blower is rotating too slowly to provide sufficient air flow in
the shelf.
•
The EMU intake air temperature exceeds the user-defined
temperature setting.
•
The backplane exhaust air temperature exceeds the user-defined
temperature setting.
Compaq suggests using the set emu fanspeed=high command
for either of the following conditions:
•
EMU intake air temperature is more than 38°C (100°F).
•
No air conditioning is available.
If the EMU detects a blower or temperature error condition, it
automatically switches all the operational blowers to high-speed. This
speed increases the air flow through the enclosure and reduces the
possibility of component failure. Simultaneously, the EMU initiates
the following actions:
•
Sounds the audible alarm on the EMU.
•
Turns O
the amber system fault LED if the temperature exceeds
N
an established set point.
•
Turns O
the amber temperature fault LED.
N
•
Notifies the array controller of the error condition.
Environmental Monitoring Unit
Note
UltraSCSI RAID Enclosure 3–13