IBM DS3950, Installation, User'S, And Maintenance Manual, Page: 49 / 252

Environmental requirements and specifications
This section describes the environmental requirements and specifications for the
DS3950 storage subsystem, including temperature and humidity, altitude, airflow
and heat dissipation, shock and vibration requirements, and acoustic noise levels.
Temperature and humidity
Table 6 lists the acceptable temperature and humidity ranges for the DS3950
Storage Subsystem when in storage or in transit. Table 7 lists temperature and
humidity ranges for the storage subsystem in typical Information Technology (IT)
or office environments. Table 8 lists temperature and humidity ranges for the
storage subsystem in a NEBS/ETSI compliant environment.
Note: 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.
Important: The recommended operating environment air temperature is 22° C (72°
F) or lower.
Table 6. Temperature and humidity requirements for storage subsystem when in storage or in
transit
Condition Parameter Requirement
Temperature Storage range -10° - 65° C (14° - 149° F)
Maximum rate of change 15° C (27° F) per hour
Transit range -40° C to 65° C (-40° F to 149°
F)
Maximum rate of change 20° C (36° F) per hour
Relative humidity (no
condensation) Storage range 8% to 90%
Transit range 5% to 95%
Maximum dew point 26° C (79° F)
Maximum gradient 10% per hour
Table 7. Temperature and humidity requirements for storage subsystem in a typical
Information Technology (IT) or office environment
Condition Parameter Requirement
Temperature Operating range 10° - 35° C (50° - 95° F)
Maximum rate of change 10° C (18° F) per hour
Relative humidity (no
condensation) Operating range 8% to 80%
Table 8. Temperature and humidity requirements for storage subsystem 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)
Chapter 1. Introduction
21