Rear controls, indicators, and connectors

General-system-error LED (amber)

When lit, this amber LED indicates that the unit has a fault, such as in a power supply, ESM board, or hard disk drive.

Bridge card bay

This is the location of the bridge card CRU.

Filler panel

Expansion units shipped without a full set of drives (14) contain filler panels in the unused drive bays. Before installing new drives, you must remove the filler panels and save them for later use. Each of the 14 bays must always contain either a filler panel or a drive CRU.

Drive bays There are 14 drive bays that contain either a drive CRU or a filler panel. Latch This multipurpose blue latch releases or locks the drive CRU in place.

Tray handle You can use this multipurpose handle to insert and remove a drive CRU in the bay.

Fault LED (amber)

Each drive CRU has a fault LED. When lit, this amber LED indicates a drive failure. When flashing, this amber LED indicates that a drive Identify or Rebuild is in progress.

Activity LED (green)

Each drive CRU has an activity LED. When flashing, this green LED indicates drive activity.

Drive CRU You can install up to 14 hot-swap drive CRUs in the expansion unit. Each drive CRU consists of a hard disk drive and tray.

Rear controls, indicators, and connectors

Two hot-swap power supplies with built-in fans and two environmental services monitor (ESM) boards are accessible from the back of the expansion unit. These components contain several user indicators and connectors.