Environmental Monitoring Unit (EMU)
UltraSCSI RAID Enclosure 3–13
Setting the Blower Speed Control
The UltraSCSI enclosure blowers normally operate at low speed and
provide sufficient air flow to cool the enclosure components and ensure
proper operation. Use the CLI
set emu fanspeed
command to change
the operating speed of the blowers.
•
When you enter
set emu fanspeed=high,
all blowers in all
enclosures operate at high speed.
•
When you enter
set emu fanspeed=automatic,
the local EMU
controls the blower speed in each enclosure.
_____________________ Note ______________________
For detailed instructions about using the
set emu
commands,
refer to the array controller documentation.
________________________________________________
DIGITAL recommends using the
set emu fanspeed=automatic
so
that each EMU can implement corrective action whenever one of the
following error conditions occurs:
•
A blower fails
•
You remove a blower
•
A blower is rotating too slowly to provide sufficient air flow
•
The intake air temperature exceeds the user defined temperature
•
Either backplane temperature exceeds the user defined temperature
DIGITAL suggests using
set emu fanspeed=high
whenever the
following conditions exist:
•
The intake temperature is more than 38°C (100°F)
•
There is no air conditioning
•
Both conditions exist
When the EMU detects a blower or temperature error condition it can
automatically switch all the operational blowers to high speed. This thereby
increases the air flow through the enclosure and reduces the possibility of
component failure. Simultaneously, the EMU can initiate the following
actions:
•
Enable the audible alarm on the EMU
Summary of Contents for StorageWorks UltraSCSI DS-BA370 Series
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