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44 Chapter 4
Connecting an Uninterruptible Power Supply
To protect the system’s operation during an interruption in power, you may want to install an
uninterruptible power supply (UPS) in or near the rack that holds your Xserve RAID system.
The UPS unit must have a serial interface that supports the basic signaling protocol.
You can obtain a UPS unit through the Apple online store at www.apple.com.
Follow these steps to connect a UPS unit to the system.
1 If necessary, install the UPS unit in the rack, using the instructions supplied with the unit.
2 Connect one end of a serial cable to the appropriate port on the UPS.
The cable must be configured to support the basic signalling protocol.
3 Connect the DB-9 connector at the other end of the serial cable to the UPS interface on
either of the RAID controllers.
4 Plug one of the system’s power cords into the UPS.
If you connect two UPS units to the system, plug one power cord into each UPS unit.
UPS interface ports