Digital Equipment StorageWorks UltraSCSI DS-BA370 Series, User Manual

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Environmental Monitoring Unit (EMU)
UltraSCSI RAID Enclosure 3–3
In some instances, such as a blower failure, a high intake air temperature, or
a high internal enclosure (exhaust) temperature, the EMU can automatically
initiate a corrective action. For example, operating the blowers at high
speed. When there is the possibility of component damage due to
overheating, the EMU can turn off the enclosure power.
_____________________ Note ______________________
Unless the array controller is shut down, the EMU cannot place
the enclosure into the standby power mode due to an
overtemperature.
When the array controller is operational, an overtemperature
condition causes the EMU to turn the enclosure power
O
FF
.
When the master enclosure has an overtemperature condition,
clearing the cache module prior to turning off the power does
not occur.
________________________________________________
Controller Status
The master EMU monitors the state of both array controllers. Should the
EMU detect a controller fault it can implement the following actions:
•
Sound the audible alarm
•
Cause the EMU system fault status LED to flash
•
Display a controller fault code on the blower LEDs after you
momentarily press the alarm control switch
_____________________ Note ______________________
An error on the EMU–array controller communications path can
also cause a controller fault.
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