IBM DS8880 Series Introduction And Planning Manual page 176

Fans and air intake areas
The storage system provides air circulation through various fans throughout the
frame. You must maintain the correct operating environment requirements for your
models at each air intake location.
Table 82 summarizes fan, intake, and exhaust locations.
Operating environment requirements
You must meet specific operating environment requirements at all the air intake
locations of your storage system.
The operating points vary depending on the state of the system. The system can be
in the following states:
v Powered on
v Powered off
v In storage
Powered on:
Plan for the operating ranges and recommended operating points of the storage
system.
Table 83 provides the operating ranges for your storage system when its power is
on.
Table 84 provides the optimum operating points for your storage system with its
power on.
Table 85 on page 165 provides the operating ranges for a storage system with
power on.
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DS8880 Introduction and Planning Guide
Table 82. Machine fan location
DS8880 Fan Location Machine Location
Entire machine Entire
Power complex Bottom
Table 83. Operating extremes with the power on
Measurement
Altitude
Dry bulb temperature
Relative humidity
Wet bulb temperature (maximum)
Table 84. Optimum operating points with the power on
Measurement
Temperature
Relative humidity
Intake Location
Front covers
Front covers
Value
0 - 2133 m (0 - 7000 ft)
16 - 32°C (60 - 90°F)
20 - 80%
23°C (73°F)
Value
22°C (72°F)
45%
Exhaust Location
Rear covers
Rear covers