The library provides a single power supply with each library. However, a secondary redundant
power supply for the base module can be added. In addition, each expansion module with drives
installed requires a power supply. See Optional features.
Remember: For a single module (expansion or base) having two power supplies, the second power
supply is deemed as redundant. However, if two or more modules have their individual power supply,
then there is no redundant power supply.
