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For enclosures with fewer than the maximum number of elements installed, install blank
panels or blank bezels to control airflow. Blank panels are required for empty array
controller and cache module bays to reduce electromagnetic interference (EMI) and to
maintain cooling airflow within operational requirements.
NOTE: Compaq recommends using blank panels at all times for any empty enclosure element
location to prevent a potential overtemperature condition. Since only two ECB bays are used at
any one time—one per cache module—install a blank in any vacant ECB bay.
The enclosure mounts in a rack (cabinet) containing Radio Electronics Television
Manufacturing Association (RETMA)—now known as Electronics Industries Association
(EIA)—mounting rails. In a RETMA rack, the enclosure installs in a four unit (4U, which
equals 177 mm/7 in) mounting space. To fill the full 4U height, a filler panel is positioned
directly above the enclosure.
Prerequisites
The minimum set of major elements recommended for enclosure operations includes:
Array controller
Cache module
EMU
ECB
Two 180 W power supplies
Three fans
I/O modules:
Two in a Model 2100 enclosure
Six in a Model 2200 enclosure
WARNING: When both array controller bays or a cache module bay is empty, a shock
hazard exists on the backplane. Do not touch the backplane.
Always install a blank panel in any bay not currently in use.
Introducing the Controller Enclosure
1–3
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