IBM DS8800, Introduction And Planning Manual, Page: 169 / 256

2. If you install the storage units on a raised floor, use the following
measurements when you cut the floor tile for the cabling:
v
Width: 45.7 cm (18.0 in.)
v Depth: 16 cm (6.3 in.)
Note:
If both rack 1 and 2 use an overhead cable management (top exit
bracket) feature for the power cords and communication cables, the PCIe
and SPCN cables can be routed under the rack, on top of the raised
floor. This is the same routing used for nonraised floor installations.
There is room under the racks to coil extra cable length and prevent the
need for custom floor tile cutouts. Also, racks 3 and 4 do not need floor
tile cutouts when the top exit bracket feature is installed as only routing
for power cords is needed.
Nonraised floors with overhead cable management
Raised floors are recommended to provide better support for the cabling needed
by the storage units, and to ensure you have efficient cooling for your units.
However, for the DS8800 (Model 951) a new option is available for overhead
cabling (the top exit bracket feature), which provides many benefits for nonraised
floor installations. Unlike raised-floor cabling, the installation planning, cable
length, and the machine location in relation to the cable entry point are quite
critical to the successful installation of a top exit bracket feature. Measurements for
Cable
Cutout
16
(6.3)
Front
Rear
f2c01574
45.7
(18)
Figure 20. Cable cutouts for a DS8800
Chapter 6. Meeting DS8000 series delivery and installation requirements
147