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When racks that contain many storage expansion enclosures are to be installed
together, the following requirements must be met to ensure that the storage
expansion enclosures are adequately cooled:
v Air enters at the front of the rack and leaves at the back. To prevent the air that
v Where racks are in rows, each rack must touch the rack that is next to it to
v Where racks are in rows front-to-front or back-to-back, a gap of at least 1220 mm
v To ensure correct airflow in each rack, the rack filler plates must be installed in
Figure 9. Example of cold aisle/hot aisle rack configuration
18
IBM System Storage DS4000 EXP420 Storage Expansion Enclosure: Installation, User's and Maintenance Guide
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 and hot aisle and is shown in Figure 9.
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.
(48 in.) must separate the rows across the cold aisle.
unused positions. Also, all the gaps in the front of the racks must be sealed,
including the gaps between the storage expansion enclosures.
1220 mm cold
aisle width
Airflow
back
T42 racks
front
Cold aisle
front
T42 racks
back
Hot aisle
back
T42 racks
front
Perforated tiles
or gratings
2440 mm between
center lines of hot
and cold aisle
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