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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

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.

BBUs cannot be used in a BA350–MA controller shelf.

Power 4–1

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Digital Equipment Corporation Storage Works Guida Utente Pagina 37