Power supply overview

Each 12-drive or 24-drive controller shelf or drive shelf has two power-fan canisters that supply a redundant power source and adequate cooling.

The following shelves contain two power supplies (power-fan canisters):

The following figure shows an example 2U controller shelf with two power supplies (power-fan canisters). The DE120S and DE240S drive shelves are identical, but they include I/O modules (IOMs) instead of controller canisters.

Controller shelf with two power supplies (power-fan canisters) below the controller canisters.