Stratus ftServer 2600, Site Planning Manual

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Determining PDU Requirements
5-2
Stratus ftServer 2600, 4500, and 6300 Systems: Site Planning Guide (R638)
N O T E S
1. Connect each PDU to a separate AC power source.
2. Install a maximum of two pairs of PDUs in a rack.
Use the information in “Determining PDU Requirements” on page 5-2 to plan the rack
configuration for your ftServer system. “Example of PDU Usage Calculation” on
page 5-4 shows how to use the information you gather for planning the rack
configuration.
Determining PDU Requirements
Using the nominal voltage rating of the power receptacle at your site and the total
wattage of the components that will draw power from the A-side PDU, complete the
information in Tables 5-1 and 5-2 . This information will help you determine the current
that the ftServer systems and rack-mounted components will draw and whether you
need a second pair of PDUs.
To complete Table 5-1
1. Obtain the voltage available at your location. Consult a facilities manager at your
site to make sure you know the correct voltage.
2. For each type of component you plan to place in the rack, calculate the required
current, as follows: Divide the wattage of the element, listed in the Watts column of
Table 5-1 , by the voltage available at your site. Multiply the result by 1.25 and enter
the value in the
Current
column.
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
ftServer system 700 ÷ x 1.25 = 4U
1U LCD monitor unit
‡
‡ See the
Stratus ftServer Systems: Peripherals Site Planning Guide
(R582) for the wattage
and rack requirements of your monitor and disk-storage solutions.
÷ x 1.25 = 1U
Tape-drive enclosure
§
§ See your tape-drive documentation for the wattage and rack requirements of your tape
drive.
÷ x 1.25 =
Disk-storage enclosure
§
÷ x 1.25 =