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Caution - Do not allow any InfiniBand cable to experience extreme tension. Do not
pull on an InfiniBand cable or allow it to drag. Unroll an InfiniBand cable for its length.
Pulling on an InfiniBand cable can damage the cables internally.
Caution - Do not twist an InfiniBand cable more than one revolution for its entire
length. Twisting an InfiniBand cable can damage the cable internally.
Caution - Do not route InfiniBand cables where they might be stepped upon or
experience rolling loads. Such a crushing effect can damage the cable internally.
2.2.1 InfiniBand Cable Path Lengths
When handling a cable, consider the following:
•
Bends in the cable path increase the required cable length. Bends in the cable
path are usually necessary, and each bend increases the total length. Rarely does
a cable travel in a straight line from connector to connector.
•
Bundling increases the required length of the cables. Bundling causes one or more
cables to follow a common path. However, the bend radius is different in different
parts of the bundle. If the bundle is large and unorganized, and there are many
bends, one cable might experience only the inner radius of bends, while another
cable might experience the outer radius of bends. In this situation, the differences
of the required lengths of the cables are quite substantial.
•
If you are routing the InfiniBand cables under the floor, consider the height of the
raised floor.
2.2.2 InfiniBand Cable Bundling
When bundling InfiniBand cables in groups, use hook-and-loop straps to keep cables
organized. If possible, use color-coordinated straps to help identify cables and their
routing. The InfiniBand 4X copper conductor cables are fairly thick and heavy for their
length. Consider the retention strength of the hook-and-loop straps when supporting
cables. Bundle as few cables as reasonably possible.
You can bundle the cables using many hook-and-loop straps. Place the hook-and-loop
straps as close together as reasonably possible, for example, every 1 foot (0.3 m). If a
cable breaks free from a strap, the cable cannot fall far before it is retained by another
strap. If the InfiniBand cables break free of their straps and fall free, the cables might
break internally when they strike the floor or are jerked from tension.
2.2.3 Floor and Underfloor Delivery of InfiniBand Cables
The switch accepts InfiniBand cables from floor or underfloor delivery. Floor and
underfloor delivery limits the tension in the InfiniBand cable to the weight of the cable
for the rack height of the switch.
Note - Overhead cabling details are not included in this guide. For details on overhead
cabling, contact a certified service engineer.
2.3 Preparing the Cabling Site
It is the customer's responsibility to prepare the site prior to multirack cabling of
Exalogic machines. Refer to the Oracle Exalogic Elastic Cloud Machine Owner's
Chapter 2
Preparing the Cabling Site
2-2
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