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Table 9 lists the KVA, watts, and Btu calculations. These values assume the power
supplies have a 70 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.
Table 9. DS4500 power and heat dissipation
KVA Watts (AC) Btu per hour
0.23 230 786.6
Acoustic noise
Table 10 lists the maximum sound levels emitted by the storage subsystem.
Table 10. DS4500 sound levels
Measurement Level
Sound power (normal operation) 6.5 bels
Sound pressure (normal operation) 65 dBA
These levels are measured in controlled acoustical environments according to ISO
7779 and are reported in accordance with ISO 9296. The declared sound power
levels indicate an upper limit, below which a large portion of machines operate.
Sound pressure levels in your location might exceed the average 1-meter values
stated because of room reflections and other nearby noise.
Electrical requirements
This section provides information regarding site power and wiring, storage
subsystem AC power requirements, and power cord routing instructions.
Consider the following information when preparing the installation site:
v Protective ground – Site wiring must include a protective ground connection to
the AC power source.
Figure 6. DS4500 airflow
16 IBM TotalStorage DS4500 Fibre Channel Storage Subsystem: Installation, User’s, and Maintenance Guide