IBM TotalStorage Installation Manual page 39

San volume controller
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1. Refer to the customer's hardware location table to find out where in the rack
the uninterruptible power supplies are to be installed.
2. Discard the two handles and their associated nuts that are shipped with the
support rails for the uninterruptible power supply.
3. At the back of the rack, observe the Electrical Industries Association (EIA)
positions, and determine where you are going to install the uninterruptible
power supply (see Figure 19). An uninterruptible power supply must always
be installed into the lowest available position in the rack. The only device that
can be below a uninterruptible power supply is another uninterruptible power
supply.
Note: The bottom of the flange of the support rail must align with the EIA
mark on the rack.
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Figure 19. Installing support rails for a uninterruptible power supply into the rack
Chapter 4. Installing the uninterruptible power supply, the master console, and the SAN Volume Controller
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