User's Guide

24
Power unit slots
The Enclosure can accommodate up to six power units in the rear. Slots 2, 3, 5 and 6 have blank covers,
while slots 1 and 4 do not.
The number of CPU blades installed determines the number of power units required.
Refer to the table below.
IMPORTANT:
 Mount the power units of the same model number. If the ones with different model numbers are
used, the system does not work properly.
 If power units are not installed as instructed in the table below, they will be detected as an
insufficient power error by the Enclosure Manager Card (EM Card). Even if this error is detected,
powering on a powered-off CPU blade is unavailable when you turn it on.
The number of CPU blades installed and the number of power units required
The number of power units required depends on the total power consumption of the CPU blades.
Follow the steps below to determine the number of power units required.
1. Use the following formula to determine the total DC power consumption
Total DC power consumption (W) = Total CPU blade power
consumption + 1260 (W), where 1260 is the power consumption of the blade enclosure.*
*The power consumption of the blade enclosure includes that of switch modules and fan units.
The total CPU blade power consumption should be determined by summing up the power con
sumptions of the different types of CPU blades installed in the Blade Enclosure.
For information on the power consumptions of different types of CPU blades, see the User’s
Guide for the configuration guide included with your CPU blade.