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Power Redundancy
The cabinet should be configured with at least two PDUs that are appropriate for the
current load of the equipment installed in the rack. PDUs typically are installed
vertically on both the left and right sides of the cabinet, with one PDU providing
power to the storage system's left-side components; and the other PDU providing
power to the right-side components. See
for an example.
FIGURE 2-8
Cabinet PDUs and Power Strips
FIGURE 2-8
The PDUs should be plugged into separate and independent, customer-supplied,
power drops (circuits) so that if any one power source is lost, it would not affect the
function of the storage system. Each PDU should have a switch or circuit breaker to
enable or disable power.
When new equipment is added to the cabinet, it is important to calculate the current
being drawn by each device to ensure that the maximum current rating of the
PDU(s) is not exceeded. If existing equipment is already installed in the cabinet then
it is the customer's responsibility to calculate the current being drawn by each
device to ensure that the maximum current rating provided to the cabinet is not
exceeded.
In many cabinets a label is attached to the PDU to identify the maximum current
supported by that PDU. Use this information to calculate whether or not the cabinet
is capable of handling the current required to support the equipment that is planned
to be installed.
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Sun StorageTek 6540 Rack Ready Site Preparation and Installation Support Guide • July 2006
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