| Canisters |CanistersCanisters consist of three different types: power-fan canisters (power supplies) that supply a redundant powersource and adequate cooling in a 12-drive or 24-drive controller shelf or drive shelf; power canisters that areused for power redundancy in a 60-drive controller shelf or drive shelf; and fan canisters that are used forcooling the 60-drive controller shelf or drive shelf.Overview and requirementsThis topic provides an overview of the canister types and describes the requirements you need to know aboutbefore replacing a canister.Power supply overviewEach 24-drive controller shelf or drive shelf includes two power supplies with integrated fans. These arereferred to as power-fan canisters in SANtricity System Manager. If a power-fan canister fails, you must replaceit as soon as possible to ensure that the shelf has a redundant power source and adequate cooling.You replace a power supply in the following shelves:• HB5100 controller shelf• DE224C drive shelfThe following figure shows an example HB5100 controller shelf with two power supplies (power-fancanisters). The DE224C drive shelves are identical, but they include I/O modules (IOMs) instead of controllercanisters.Controller shelf with two power supplies (power-fan canisters) below the controller canisters.The Replace power supply topics do not describe how to replace a failed power-fan canister in a DE1600 orDE5600 drive tray, which might be connected to the HB5000 or HB2000 controller shelves. For instructions forthose drive tray models, refer to Replacing a Power-Fan Canister in the DE1600 Drive Tray or the DE5600 DriveTray, available from the Fujitsu ETERNUS AB/HB Series and SANtricity Resource page.Power canister overviewEach 60-drive controller shelf or drive shelf includes two power canisters for power redundancy.You can replace a power canister in the following shelves:• HB5200 controller shelves• DE460C drive shelfThe Replace power canister topics do not describe how to replace a failed power canister in a DE6600 drivetray, which might be connected to the controller shelf.The following figure shows the back of a DE460C drive shelf with the two power canisters:28