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EK-BA370-UP-A01

August 1997

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Document:	Improving UltraSCSI RAID Subsystem Operation
Order Number:	EK-BA370-UP
Revision:	A01
Pages:	1
Original Filename:

OCR Text

Improving UltraSCSI RAID
Subsystem Operation
DIGITAL is manufacturing the DS–BA370–series
UltraSCSI enclosures with the following temperature set
points:
• EMU —41°C (106°F)
• Backplane—48°C (118°F)
The procedure for establishing different temperature set
points on pages 3–7 through 3–9, DIGITAL StorageWorks
UltraSCSI RAID Enclosure (DS–BA370–Series) User’s
Guide, is replaced by the following:

Setting the Temperature Sensors
There are three temperature sensors in each UltraSCSI
enclosure – two on the rear of the backplane in the top
middle and one mounted on the EMU module. You have
the option of setting the temperature at which an individual
sensor reports an overtemperature condition. You enter the
desired temperature in degrees Celsius (°C) within the range
of 0°C (32°F) through 49°C (120°F).
The EMU sensor monitors the EMU air temperature, while
the two enclosure sensors monitor the exhaust air
temperature. The exhaust air temperature is higher than the
EMU air temperature.
In an expansion configuration you can only set the master
EMU temperatures. The temperature set points for the other
UltraSCSI enclosures automatically change to match the
master EMU setting.
Use the following CLI commands to set the temperature set
point for each EMU:
set emu sensor_1_set point=48
set emu sensor_2_set point=48
set emu sensor_3_set point=41
where:
1 = backplane sensor 1 (exhaust)
2 = backplane sensor 2 (exhaust)
3 = EMU sensor (intake)
DIGITAL recommends that you use these set points.

All temperatures are entered in degrees Centigrade
(°C). You cannot enter temperatures as fractions,
decimals, or degrees Fahrenheit (°F).
2. The EMU set point (sensor_3) temperature must be a
minimum of 6°C (11°F) greater than the highest
expected ambient temperature.
3. The backplane set points (sensor_1 and sensor_2) must
be the same temperature.
4. The backplane set points (sensor_1 and sensor_2) must
be a minimum of 13°C (23°F) greater than the highest
expected ambient temperature.
Temperature Conversion
Use the following table to convert °F to °C.
°C

°F

°C

°F

°C

°F

°C

°F

100

102

104

106

108

109

111

113

115

104

117

106

118

108

120

_________________ Caution ________________
Use of the CLI command
set emu sensor_n set point=default
establishes a set point that is too low. This can
result in an erroneous subsystem alarm.
__________________________________________
Temperature Set Point Rules
You can set the temperature set points to other temperatures
providing you implement the following rules:

EK–BA370-UP. A01
August 1997