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Operational Vibration (Sweep): While in its normal operating position, the DS4500
will continue operating when subjected to the following vibration sweep:
v Frequency sweep = 3 Hz -150 Hz -3 Hz
v Wave form = Sinusoidal, 0.25g
Operational
Vibration (Random): While in its normal operating position, the
DS4500 will continue operating when subjected to a random vibration test using the
criteria shown in Table 12. This test uses the indicated spectral power density for 30
minutes in each of the three axes.
Table 12. Random Vibration Power Spectral Density
Hz 5 17 45 48 62 65 150 200 500
g2/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
Heat output, airflow, and cooling
See “Airflow and heat dissipation” on page 15 for heat output, airflow, and cooling
specifications.
Note: In general, disk subsystem reliability tends to decrease as the ambient
temperature of the environment in which it is being used increases. The
ambient temperature in the immediate area of the disk enclosure unit should
be kept near 22° C (72° F), or lower, to provide better reliability.
When racks that contain many DS4500s are to be installed together, the following
requirements must be met to ensure that the DS4500s are adequately cooled:
v Air enters at the front of the rack and leaves at the back. To prevent the air that
is leaving the rack from entering the intake of another piece of equipment, you
must position the racks in alternate rows, back-to-back and front-to-front. This
arrangement is known as “cold aisle/hot aisle” and is shown in Figure 7 on page
19.
v Where racks are in rows, each rack must touch the rack that is next to it to
reduce the amount of hot air that can flow around from the back of the rack into
the intakes of the storage expansion enclosures that are in that rack. You should
use Suite Attach Kits to completely seal any gaps that remain between the racks.
For details about Suite Attach Kits, contact your marketing representative.
v Where racks are in rows front-to-front or back-to-back, a gap of at least 1220 mm
(48 in.) must separate the rows across the cold aisle.
v To ensure correct airflow in each rack, the rack filler plates must be installed in
unused positions. Also, all the gaps in the front of the racks must be sealed,
including the gaps between the storage subsystems.
18 IBM TotalStorage DS4500 Fibre Channel Storage Subsystem: Installation, User’s, and Maintenance Guide