Cooling Requirements 
The Eserver pSeries 690 requires air for cooling. As shown in ″Proposed Floor Layout for Multiple 
Systems″  on page 193, rows of Eserver pSeries 690 systems must face front-to-front. The use of a 
raised floor is recommended to provide air through perforated floor panels placed in rows between the 
fronts of systems (the cold aisles shown in the figure on page 193). 
Note:   Do not place perforated tiles in the hot aisles. Heated exhaust air must exit the computer room 
through the ceiling air-return system. 
The following table provides system cooling requirements based on system configuration. The letter 
designations in the table correspond to the letter designations in the graph shown in “Cooling 
Requirements Graph” on page 198.
 
 
Number of I/O Drawers 
(7040-61D)
 
1.1 GHz 8-way Modules (Cooling Chart Reference) 
8-way  16-way  24-way  32-way 
1  A  B  B  C 
2  B  B  C  C 
3  N/A  C  C  D 
4  N/A  C  D  E 
5  N/A  N/A  D  E 
6  N/A  N/A  D  E 
7  N/A  N/A  N/A  E 
8  N/A  N/A  N/A  F 
  
 
Number of I/O Drawers (7040-61D)  1.3 GHz 4-way Modules (Cooling Chart Reference) 
8-way  16-way 
1  B  C 
2  B  D 
3  C  D 
4  C  D 
5  N/A  E 
6  N/A  E 
7  N/A  F 
8  N/A  F 
  
 
Number of I/O Drawers 
(7040-61D) 
1.3 GHz 8-way Modules (Cooling Chart Reference) 
8-way  16-way  24-way  32-way 
1  A  B  C  C 
2  B  B  C  D 
3  N/A  C  C  D 
4  N/A  C  D  D 
5  N/A  N/A  D  E 
6  N/A  N/A  D  E 
7  N/A  N/A  N/A  F 
8  N/A  N/A  N/A  F 
 
 
196  Site and Hardware Planning Information