IBM System Storage Subsystem DS5020 - Manual (Page 52)

Table 8 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.
Table 8. DS5020 power and heat dissipation
Parameter KVA Watts (ac) Btu per hour
DS5020 0.496 447 1529
Shock and vibration requirements
Operational shock and operational vibration requirements are shown in this section.
Operational Shock: The DS5020 will be able to withstand the following shock.
Subjecting the equipment to a single shock pulse with the following characteristics
will simulate this level of shock:
v Velocity change = 20 inches per second
v Wave ® form = Triangular, 10g @3.75 ms
Operational Vibration (Random): While in its normal operating position, the
DS5020 will continue operating when subjected to a random vibration test using the
criteria shown in Table 9. This test uses the indicated spectral power density for 30
minutes in each of the three axes.
Table 9. Random vibration power spectral density
Hz 5 17 45 48 62 65 150 200 500
g 2 /Hz 2.0x10-7 -7 2.2x10 -5 2.2x10 -5 2.2x10 -5 2.2x10 -5 2.2x10 -5 2.2x10 -5 2.2x10 -5 2.2x10 -5
Acoustic noise
Table 10 lists the maximum sound levels emitted by the storage subsystem.
Table 10. DS5020 sound levels
Measurement Level
Sound power (normal operation) 6.4 bels
Sound pressure (normal operation) 68 dBA
Figure 10. DS5020 airflow
22 IBM System Storage DS5020 Storage Subsystem: Installation, User’s, and Maintenance Guide