Dell Unity™ All Flash and Unity Hybrid Unity 480/F, Unity 680/F, Unity 880/F Hardware Information Guide

The 25-drive DPE is two rack units (U), 8.9 cm (3.5 in.) high, 79.2 cm (31.2 in.) deep, and includes slots for twenty-five 2.5-in. drives.

Drives

The DPE consists of the following components:

• Drives
• Midplane
• Storage processor assembly
• Power supply module
• EMI shielding

Each drive consists of one drive in a carrier. The 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 drive in place to ensure proper connection with the midplane. Drive activity and fault LEDs are located on the front of the enclosure.

SAS and SAS flash drives are supported. The drives are populated in the system from left to right.

You can visually distinguish between drive types by their different latch and handle mechanisms and by type, capacity, and speed labels on each drive. You can add or remove a drive while the DPE is powered on, but you should exercise special care when removing modules while they are in use. Drives are sensitive electronic components.

The midplane separates the front-facing drives from the rear-facing SP assemblies. It distributes power and signals to all components in the enclosure. The SP assemblies and drives plug directly into the midplane.

Each DPE contains two SP assemblies. The SP assembly is the intelligent component providing the compute capability of the DPE. Acting as the control center, each SP assembly includes status LEDs.

Each SP assembly contains a power supply module that connects the system to an exterior power source. Redundant power supplies can keep the entire DPE running if one power supply fails. The power supplies include LEDs to indicate component status. A latch on the module locks it into place to ensure proper connection.

EMI compliance requires a properly installed electromagnetic interference (EMI) shield in front of the DPE drives. When installed in cabinets that include a front door, the DPE includes a simple EMI shield. Other installations require a front bezel that has a locking latch and integrated EMI shield. Remove the bezel or shield to remove and install the drives.