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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 17. DS4700 Express power and heat dissipation
Parameter KVA Watts (ac) Btu per hour
DS4700 Express 0.454 443 1516
Shock and vibration requirements
Operational shock and operational vibration requirements are shown in this section.
Operational Shock: The DS4700 Express 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
DS4700 Express will continue operating when subjected to a random vibration test
using the criteria shown in Table 18. This test uses the indicated spectral power
density for 30 minutes in each of the three axes.
Table 18. 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 19 lists the maximum sound levels emitted by the storage subsystem.
Table 19. DS4700 Express sound levels
Measurement Level
Sound power (normal operation) 6.8 bels
Sound pressure (normal operation) 68 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, dc 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.
Note: Protective ground is also known as safety ground or chassis ground.
26 IBM System Storage DS4700 Express Storage Subsystem: Installation, User’s and Maintenance Guide