Altitude; Airflow And Heat Dissipation; Ds3950 Airflow - IBM DS3950 Installation, User's, And Maintenance Manual

Table 8. Temperature and humidity requirements for storage subsystem in a NEBS/ETSI
compliant environment (continued)
Condition
Notes:
1. In a NEBS/ETSI compliant environment, conditions are measured at a location 1.5 m (59
2. Short-term refers to a period of not more than 96 consecutive hours and a total of not

Altitude

Table 9 lists the acceptable altitudes for operating, storing, and shipping the
DS3950.
Table 9. DS3950 altitude ranges
Environment
Operating
Storage
Transit

Airflow and heat dissipation

Figure 9 shows the intended airflow for the DS3950. Allow at least 30 inches in
front of the storage subsystem and at least 24 inches behind the storage subsystem
for service clearance, proper ventilation, and heat dissipation.
Figure 9. DS3950 airflow
Table 10 on page 23 lists the KVA, watts, and Btu calculations. These values
assume the power supplies have a 73 percent efficiency and a power factor of 0.99.
These tabulated power and heat dissipation values are typical for the storage
subsystem. Maximum configuration units are typically operated at higher data
rates, have larger random access memory (RAM) capacities, or have different host
interface boards.
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IBM System Storage DS3950 Storage Subsystem: Installation, User's, and Maintenance Guide
in.) above the floor and 400 mm (15.8 in.) in front of the equipment.
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.)
Parameter
Altitude
30.5 m (100 ft.) below sea level to 3000 m
(9842 ft.) above sea level
30.5 m (100 ft.) below sea level to 3000 m
(9842 ft.) above sea level
30.5 m (100 ft.) below sea level to 12,000 m
(40,000 ft.) above sea level
Requirement