Alignment Pins With And Without Spacers; Alignment Pin Requirements For Different Rack Flange Hole Types - IBM TotalStorage DS4100 Installation, User's, And Maintenance Manual

Attention: Both support rails are shipped with three screws and spacers,
called alignment pins, already installed at the front of each rail. They have
been inserted in the front of each support rail as guides to indicate where not
to use M6 screws when you attach the front of the support rail to the rack
cabinet. See Figure 11.
Alignment pins with spacers
1
2
Alignment pin without spacer
3
Figure 11. Alignment pins with and without spacers
Depending on which type of rack mounting flange is present on your rack
cabinet, you might have to remove some or all of the spacers. For example, if
the rack cabinet in which you are installing the support rails has round holes,
you will need to remove the spacers from the top and bottom alignment pins
so that the rail sits flush with the rack cabinet. See Table 11.
Table 11. Alignment pin requirements for different rack flange hole types
Rack flange type
Square hole
Round hole
Threaded hole
4. The rack-mounted unit is three EIA units high. Decide accordingly where you
are going to install the support rails.
Attention: Use the rack mounting template provided in Figure 9 on page 21
and Figure 10 on page 22 to locate the proper rack mounting holes for
installing the support rails into the rack cabinet.
Note the following considerations before you choose where to install the rails:
v If you are installing the DS4100 into an empty rack, install it into the lowest
available position so that the rack does not become unstable.
v If you are installing more than one DS4100 in the rack, start at the lowest
available position, and work upward.
v If appropriate, allow for possible later installation of other units.
v If necessary, remove the rack power distribution unit before you install the
support rails.
v For procedures and more information, refer to the installation and service
guide, or equivalent, for the rack cabinet.
Pins to remove
None
1 and 3
All
Chapter 2. Installing the storage server
23