Determining PDU Requirements
Rack Configuration Planning 5-3
To complete Table 5-2
1. In column 1, write the names of each system or component in the rack. If you have
more than one system, use a row for each system.
2. In column 2, write the cumulative number of rack units (Us): Add the number of Us
(see Table 5-1) for the component to the value in the space above and write the
result.
3. In column 3, write the cumulative number of outlets required. For each component,
add 1 to the value in the space above and write the result.
4. In column 4, write the cumulative current required. For each component, add the
current for the component, which you entered in Table 5-1, to the value in the space
above and write the result.
You need another pair of PDUs if the cumulative number of outlets exceeds 8 or if the
cumulative current exceeds 15A. Use the information in column 2 to plan the size and
number of racks required.
Table 5-1. Current and Rack-Space Requirements
Component Watts ÷
Site
Voltage
†
† PDU input voltage is 200-240 VAC.
x 1.25 =
Current
(A)
Rack
Space
Single CPU-I/O
enclosure of ftServer
2900 or 4900 system
800 ÷ 200 x 1.25 = 5A 4U
(full
system)
Single CPU-I/O
enclosure of ftServer
6900 system
1000 ÷ 200 x 1.25 = 5A 4U
(full
system)
Tape-drive enclosure
‡
‡ See your tape-drive documentation for the wattage and rack requirements of your tape
drive.
Disk-storage enclosure
§
§ See Table 7-1 for the wattage and rack requirements of your disk-storage solutions.
÷x 1.25 =
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