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Dell Unity™ All Flash and Unity Hybrid Hardware Information Guide

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General information on drawer-type DAEs

Each DAE with internal drives typically consists of the following components:

  • Drive carrier
  • Disk drive
  • Link control cards (LCCs)
  • Power supply
  • Cooling modules
  • EMI shielding
  • Cable management arms

Drive carrier

The disk drive carriers are metal and plastic assemblies that provide smooth, reliable contact with the enclosure slot guides and midplane connectors. Each carrier has a handle with a latch and spring clips. The latch holds the disk drive in place to ensure proper connection with the midplane. Disk drive activity/fault LEDs are integrated into the carrier.

Disk drives

Each disk drive consists of one disk drive in a carrier. You can visually distinguish between disk drive types by their different latch and handle mechanisms and by type, capacity, and speed labels on each disk drive. You can add or remove a disk drive while the DAE is powered up, but you should exercise special care when removing disk drives while they are in use. Disk drives are extremely sensitive electronic components.

Link control cards (LCCs)

An LCC supports, controls, and monitors the DAE, and is the primary interconnect management element. Each LCC includes connectors for input and expansion to downstream devices. An enclosure address (EA) indicator and bus (loop) identification indicator is located on one LCC of each DAE.

Power supply

The power supplies and cooling modules or fans are separated. The power supplies are located on the rear. The power supply module has an orange knob used for removing and installing the power supply module from the DAE .

Cooling modules (Fans)

The cooling modules or fans are separate from the power supply modules. The cooling modules or fans are located on the front and middle of the drawer-type DAEs, depending on DAE type. The cooling modules or fans can only be installed/removed by sliding the DAE forward. You access the cooling modules or fans from inside the DAE.

EMI shielding

EMI compliance requires a properly installed electromagnetic interference (EMI) shield in front of the DAE disk drives. When installed in cabinets that include a front door, the DAE includes a simple EMI shield. Other installations require a front bezel that has a locking latch and integrated EMI shield. You must remove the bezel/shield to remove and install the disk drive modules.

Cable management arms

Locking Scissor-type cable management arms attach to the rear of the drawer-type DAEs to provide easy cable management for the power cords and SAS cables that attach to the rear ports of the DAE. The cable management arms extend to an open position when the unlocked DAE is pulled forward in the cabinet and retract to a closed position when the DAE is pushed back into the cabinet.

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