- IBM switch Users and Maintenance Guide

Power cabling
The DS4100 base storage server uses two standard power cords, and the
single-controller storage server uses only one. You can connect the power cords to
a primary power unit inside the rack cabinet, such as a properly grounded ac
distribution unit, or to an external source, such as a properly grounded electrical
outlet.
The DS4100 storage server does not ship with power cords. Refer to Appendix C,
“Power cords,” on page 125 for the list of IBM-approved power cords for your
region. Depending on your model, the DS4100 storage server does ship with one or
two line jumper cords for connecting the DS4100 power supply or power supplies to
an IBM-approved rack power distribution unit.
If you have not already done so, attach the power cords by using Figure 55 for the
location of the component parts.
Perform the following to cable the power cords:
1. Connect the power cord to the power supply.
2. Remove the nut that holds the power cable strain-relief clamp, and then remove
the strain-relief clamp.
3. Wrap the strain-relief clamp around the power cord approximately 20 cm (8 in.)
from the power supply connection end. Leave some slack between the clamp
and the power-supply end of the power cord.
4. Replace the power cable strain-relief clamp, and tighten it securely with the nut.
5. Plug the power cord into a properly grounded electrical outlet.
Note: To maintain power redundancy, plug the storage server’s right and left
power supplies into two independent external power circuits through ac
distribution units inside a rack cabinet or directly into external
receptacles. Similarly, the right and left power supplies of the DS4000
storage expansion units attached to the DS4100 should be plugged into
the same two independent external power circuits as the DS4100.
It is recommended that you determine the maximum surge current
possible when all devices in the power circuit are started at the same
time. Based on the total number of devices on a power circuit, find the
maximum (worst-case) specification value in order to prevent the circuit
from tripping. When both power supplies are connected and the storage
server is powered on, each power supply unit will handle approximately
AC power
connector
AC power
switch
Strain-relief
clamp
Lever
-
f10ug027
Figure 55. Power cord locations
Chapter 3. Cabling the storage server 61