Table 7. Temperature and humidity requirements for storage subsystems in an Information
Technology (IT) or office environment
Condition Parameter Requirement
Temperature (storage
subsystem On)
Operating range 10° to 35°C (50.0° to 95°F)
Altitude 30.5 (100 ft) below to 3000 m
(9840 ft) above sea level
Maximum rate of change 10°C (18°F) per hour
Relative humidity (storage
subsystem On)
Operating range 20% to 80%
Maximum dew point 26°C (79°F)
Maximum humidity gradient 10% per hour
Temperature (storage
subsystem Off)
Operating range -10° to 50°C (14.0° to 120.0°F)
Maximum altitude 3000 m (9840 ft)
Maximum rate of change 15°C (27.0°F) per hour
Relative humidity (storage
subsystem Off)
Operating range 10% to 90%
Maximum dew point 26°C (79°F)
Maximum humidity gradient 10% per hour
Note:
1. The non-operating environment must not exceed the environment limits for more than
60 days.
2. The storage environment must not exceed the environment limits for more than one
year.
3. Substantial deviations from the suggested operating range, in either direction, if
sustained for extended periods of time, will expose the unit to greater risk of failure
from external causes.
Table 8 lists temperature and humidity ranges for the storage subsystem in a
NEBS/ETSI compliant environment.
Table 8. Temperature and humidity requirements for storage subsystems in a NEBS/ETSI
compliant environment
Condition Parameter Requirement
Temperature
1
Operating range 5° - 40° C (41° - 104° F)
Short-term
2
-5° - 50° C (23° - 122° F)
Maximum rate of change 30° C (54° F) per hour
Relative humidity
1
(no
condensation)
Operating range 5% to 85%
Short-term
2
5% to 90% (not to exceed
0.024 kg water/kg of dry air)
Note:
1. In a NEBS/ETSI compliant environment, conditions are measured at a location 1.5 m (59
in.) above the floor and 400 mm (15.8 in.) in front of the equipment.
2. Short-term refers to a period of not more than 96 consecutive hours and a total of not
more than 15 days in one year. (This refers to a total of 360 hours in any given year, but
no more than 15 occurrences during that one-year period.)
Electrical requirements
The electrical requirements to operate the DS3500 storage subsystem are specified
in this topic.
20 IBM System Storage DS3500 and EXP3500 Storage Subsystem: Installation, User's, and Maintenance Guide
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