User`s guide

4
Power
This chapter describes the StorageWorks power units and power configuration
rules. All of the StorageWorks power units are mounted in a 3½-inch SBB.
The are three StorageWorks power units:
• Universal ac input power supply
• Universal dc input power supply
• BBU
4.1 Shelf Power Configuration Rules
The rules for configuring the StorageWorks shelves are as follows:
• Each shelf requires either an ac or dc shelf power supply.
• Each power supply requires a switch-controlled power source.
• Each power supply can support a maximum of seven 3½-inch SBBs.
• The shelf power supply must be mounted in slot 7 (the power slot) of the
shelf.
• Either an optional redundant power supply or an optional BBU
1
can be
mounted in slot 6.
• Both ac and dc power supplies can be used in the same shelf as either the
shelf power supply or the redundant power supply.
1
BBUs cannot be used in a BA350–MA controller shelf.
Power 4–1