5. Surface debris is randomly collected from 10 areas of the data center on a 1.5 cm diameter disk of
sticky, electrically conductive tape on a metal stub. If examination of the sticky tape in a scanning
electron microscope reveals no zinc whiskers, the data center is considered free of zinc whiskers.
Cooling the storage complex
You can take steps to optimize the air circulation and cooling for your storage systems.
About this task
To optimize the cooling around your storage systems, prepare the location of your storage systems as
recommended in the following steps.
Note: The installation of a storage system is done by technical service representatives. However, the
following steps describe the process that is needed to optimize the air circulation and cooling for your
storage systems.
1. Prepare for the installation of the storage system on a raised floor. Although the storage system can be
installed on a nonraised floor, installing the storage system on a raised floor provides increased air
circulation for better cooling.
2. Install perforated tiles in the front of each base frame and expansion frame as follows:
a. For stand-alone base frames, install two fully perforated tiles in front of each base frame, as shown
in Figure 12 on page 103 in the single-machine examples ( 1 and 2 in the gure).
b. For a row of storage systems, install a row of perforated tiles in front of the storage systems as
shown in Figure 12 on page 103
( 3 in the gure).
c. For groupings of storage systems, where a hot aisle/cold aisle layout is used, use a cold aisle row of
perforated tiles in front of all storage systems. An example of a possible minimal arrangement is
shown in Figure 12 on page 103 ( 4 in the gure).
Note: Keep in mind that the example represented in Figure 12 on page 103 meets service
clearance requirements. However, floor loading requirements might require a wider hot aisle to
provide up to 30 inches of non-overlapping clearance (for total of 60 inches between the rear side
of the frames on either side of the aisle.)
102
IBM DS8900F: DS8900F Introduction and Planning Guide
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