Digital Equipment StorageWorks UltraSCSI DS-BA370 Series, User Manual

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Environmental Monitoring Unit (EMU)
UltraSCSI RAID Enclosure 3–9
EMU Firmware
The EMU firmware enables you to use CLI commands to establish limits
for EMU functions such as temperature and blower speed control. The
different versions determine the specific commands or functions available.
The EMU compares the temperature sensor readings and the blower speed
readings against the limits you entered.
When the EMU controls blower speed, it will automatically place the
blowers into the high-speed mode when the any sensor reports a
temperature that is within 4°C (7°F) of the sensor setpoint. For example, if a
temperature set point is 41°C (106°F), the EMU would cause the blowers to
operate at high speed when the temperature reaches 37°C (99°F). The
blowers operating at high-speed should prevent an overtemperature
condition occurring and shutting down the enclosure.
You must use the following CLI commands to set the temperature set point
for each EMU:
set emu sensor_1_setpoint=48
set emu sensor_2_setpoint=48
set emu sensor_3_setpoint=41
Where: 1 = backplane sensor 1 (exhaust)
2 = backplane sensor 2 (exhaust)
3 = EMU sensor (intake)
DIGITAL recommends that use these set points.
___________________ Caution _____________________
For EMU firmware versions 1.0 and 1.1 you cannot use the
command:
set emu sensor_n_setpoint=default
.
This command will establish a temperature set point that is too
low for proper operation. This can result in an erroneous
subsystem alarm.
Removing and replacing the master EMU automatically changes
the temperature set points to the default setting. You must then
set all the temperature set points using the CLI commands.
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