Considerations for Multiple System Installations
In a multi-frame installation, it is possible that a floor tile with cable cutouts (refer to “Cutting and
Placement of Floor Panels” on page 144) will bear two concentrated static loads up to 900 lbs (per
caster/leveler). Thus, the total concentrated load can be as high as 1800 lbs. Contact the floor tile
manufacturer or consult a structural engineer to ensure that the raised floor assembly can support this
load.
When you are integrating an Eserver pSeries 670 into an existing multiple-system environment, or when
adding additional systems to an installed Eserver pSeries 670, consider the following factors:
v Minimum aisle width
For multiple rows of systems containing one or more Eserver pSeries 670, the minimum aisle width in
the front of the system is 1041 mm (41 in.) and 838 mm (33 in.) in the rear of the system to allow room
to perform service operations. The minimum aisle width is in addition to the front and rear service
clearances of 1143 mm (45 in.) and 914 mm (36 in.) respectively. Service clearances are measured
from the edges of the frame (with doors open) to the nearest obstacle.
v Thermal interactions
The minimum aisle width between rows on the computer room floor is 33 or 41 inches for optimal
cooling. Aisle width is independent of which door or cover set is used. In addition, systems should be
faced front-to-front and rear-to-rear to create ″cool″ and ″hot″ aisles to maintain effective system
thermal conditions, as shown in the following illustration.
Cool aisles need to be of sufficient width to support the airflow requirements of the installed systems as
indicated in Cooling Requirements on Page 90. The airflow per tile will be dependent on the underfloor
pressure and perforations in the tile. A typical underfloor pressure of 0.025″ of water will supply 300-400
cfm through a 25% open 2’x2’ floor tile.
v Floor loading
The system can induce a concentrated load of 900 lbs per caster. It is possible that a panel structure
has to sustain a total load as high as 1800 lbs. Consult the panel manufacturer and obtain the services
of a qualified consultant or structural engineer to insure the concrete floor and the structure panel can
support these loads.
Chapter 2. Physical Characteristics of Systems 155
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