is to occupy (Z), the mounting surface of the mounting flanges (Y), and the centerline of the
component (X).
Table 46 (page 144)
lists the CG dimensions for the EVA components.
Determining the CG of a configuration may be necessary for safety considerations. CG
considerations for CG calculations do not include cables, PDU’s and other peripheral components.
Some consideration should be made to allow for some margin of safety when estimating
configuration CG.
Estimating the configuration CG requires measuring the CG of the cabinet the product will be
installed in. Use the following formula:
Σd
component
W = d
system cg
W
where d
component
= the distance of interest and W = Weight
The distance of a component is its CG’s distance from the inside base of the cabinet. For example,
if a loaded disk enclosure is to be installed into the cabinet with its bottom at 10U, the distance
for the enclosure would be (10*1.75)+2.7 inches.
Table 46 Component data
Component Data
Z (in)
Y (in)
X (in)
Weight (Lb)
U height
1
14.21
25.75
-0.108
233
HP 10K cabinet CG
0
2.625
0
1.4
3
Filler panel , 3U
7.95
2.7
-0.288
74
3
Fully loaded drive enclosure
11.89
0.365
-0.025
24.6
1
FC loop pair
0
0.875
0
0.47
1
Filler panel, 1U
10.64
2.53
-0.094
120
4
XL Controller Pair
1
1U = 1.75 inches
Airflow and Recirculation
Component Airflow Requirements
Component airflow must be directed from the front of the cabinet to the rear. Components vented
to discharge airflow from the sides must discharge to the rear of the cabinet.
Rack Airflow Requirements
The following requirements must be met to ensure adequate airflow and to prevent damage to the
equipment:
•
If the rack includes closing front and rear doors, allow 830 square inches (5,350 sq cm) of
hole evenly distributed from top to bottom to permit adequate airflow (equivalent to the required
64 percent open area for ventilation).
•
For side vented components, the clearance between the installed rack component and the
side panels of the rack must be a minimum of 2.75 inches (7 cm).
•
Always use blanking panels to fill all empty front panel U-spaces in the rack. This ensures
proper airflow. Using a rack without blanking panels results in improper cooling that can lead
to thermal damage.
Configuration Standards
EVA configurations are designed considering cable length, configuration CG, serviceability and
accessibility, and to allow for easy expansion of the system. If at all possible, it is best to configure
non HP cabinets in a like manner.
144 Non-standard rack specifications
