Dell EMC Unity XT D4122F 2U 25×2.5-inch DAE (12 Gb/s SAS) Storage Expansion Enclosure
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  • Part number:D4122F
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  • List Price was:$3,488.00
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Title

Dell EMC Unity XT D4122F 2U 25×2.5-inch DAE (12 Gb/s SAS) Storage Expansion Enclosure

Keywords

Dell EMC Unity XT, D4122F, 2U 25-Bay DAE, 12 Gb/s SAS back-end, storage expansion enclosure, Unity DAE, add capacity Unity XT, Unity storage array expansion

Description

The Dell EMC Unity XT D4122F is a 2U Disk Array Enclosure (DAE) designed to expand storage capacity for Unity XT hybrid or all-flash arrays. With support for 25 hot-swappable 2.5-inch drive bays and a 12 Gb/s SAS back-end, it adds substantial storage capacity to your Unity XT system without replacing the main Disk Processor Enclosure.

This D4122F model is suitable for both performance-oriented SSD deployments and high-density SAS/SATA drive pools, depending on your Unity XT array type (HFA or AFA). The compact 2U form factor helps optimize rack space while still delivering high expansion flexibility.

The enclosure includes dual cooling/power modules to match Unity’s redundancy philosophy, ensuring that even as you scale out capacity, reliability remains consistent. It is ideal for enterprise environments that require incremental growth of storage pools.

Networking between enclosure and processor (back-end) uses dual redundant 12 Gb/s SAS paths, enabling high throughput for read/write operations. The D4122F is fully integrated with Unity XT software and management tools so provisioning and monitoring are seamless.

For organizations looking to add capacity Unity XT, the D4122F offers a tried-and-true way to scale storage without investing in an entirely new array, delivering cost savings and flexible capacity expansion.

Key Features

  • 25 hot-swappable 2.5-inch drive bays for high-density expansion. 2U 25-Bay DAE
  • 12 Gb/s SAS back-end interface for reliable high throughput and compatibility with Unity XT storage processors. 12 Gb/s SAS back-end
  • 2U rack height for moderate footprint in data center racks—efficient use of space.
  • Redundant power supply / cooling modules typical of Dell EMC DAEs for reliability and hot-swap maintenance.
  • Integration with Unity XT management and monitoring, enabling automatic detection and health reporting. Dell EMC Unity XT
  • Support for both SSD and SAS/SATA drives (depending on configuration) so you can build performance or capacity tiers.
  • Front serviceability: drives accessible from front; rear ports for SAS interconnects for ease of cabling.

Configuration

ComponentSpecification / Details
Model / Part NumberD4122F
Form Factor2U Rack Mount Disk Array Enclosure (DAE)
Drive Bays25 × 2.5-inch hot-swappable bays
Supported Drives2.5-inch SAS, SSD or SAS/SATA depending on enclosure Tier
Back-End Interface12 Gb/s SAS interconnect to Unity XT storage processors
Cooling / Power ModulesRedundant cooling and power modules (hot-swap) typical of Dell Unity XT DAE design
Height / Rack Units2U
Use CaseCapacity Expansion for Unity XT Arrays

Compatibility

The D4122F is compatible with Dell EMC Unity XT arrays (Hybrid Flash and All-Flash) that use 12 Gb/s SAS back-end connectivity. It connects via Unity XT storage processors using SAS cables to expand storage pools.

Make sure your Unity XT controller has spare SAS-port bandwidth and supports the addition of external DAE enclosures. Firmware and Unity XT OS versions should support inter-DAE expansion and drive types (SSD/SAS) you intend to use.

Drive type matching is important: ensure drive speed, capacity and media type are consistent for best pool performance (i.e. mixing too many different drive speeds or SSD vs spinning disks may lead to uneven performance).

Power, cooling, and physical rack space requirements must be met: a 2U enclosure with 25 drives + power/cooling modules needs adequate airflow, power feeds, cable routing. Front access needed for drive insertion and removal.

Usage Scenarios

1) Incremental Capacity Scaling: When your Unity XT array is nearing its drive bay limit, adding a D4122F allows you to add 25 more 2.5-inch drives to scale capacity without controller changes or replacing the entire array.

2) Performance Tier Expansion: Use D4122F loaded with high-performance SAS SSDs to extend performance-sensitive pools; helpful for hot data or caching tiers.

3) Mixed Workload / Hybrid Storage Pools: Combine SSDs in D4122F with existing SAS/SATA drives in your Unity XT to support mixed workloads—e.g. VM hosts + file shares + backup in a single unified architecture.

4) DR / Backup Storage Growth: Ideal for expanding capacity of backup or snapshot pools, or disaster recovery mirror pools, where high capacity rather than ultra-low latency is the priority.

5) Multi-Tenant or Edge Installations: For installations where multiple customers or departments share storage, adding D4122F gives a modular way to increase capacity for different tenants without overhauling core storage.

Frequently Asked Questions

  1. Q: How many Unity XT arrays can a single D4122F be connected to?
    A: Typically, a D4122F is attached to one Unity XT controller/storage processor as part of a unified pool. Daisy-chaining multiple DAEs is supported—subject to maximum number of enclosures supported by controller firmware—but each enclosure connects via SAS links.
  2. Q: Does using SSDs in the D4122F require any special firmware or licensing changes on Unity XT?
    A: In many cases, Unity XT OS supports SSDs in DAE enclosures without extra licensing, but firmware must recognize the drive types. Always verify the Unity XT firmware version supports your intended drive-type mix (SAS SSD / SATA / high-capacity drives).
  3. Q: What is the expected throughput / latency impact when using a D4122F compared to drives in the main DPE?
    A: Drives in a DAE are accessed over SAS back-end links; if enough bandwidth and SAS path redundancy are maintained, the performance is close to drives in the main DPE, though latency might be modestly higher due to additional SAS hops and cable lengths. For many applications the difference is negligible.
  4. Q: Can I mix drive sizes and types (SSD / SAS / SATA) in a single D4122F enclosure?
    A: Unity XT supports mixed drive types across the overall storage pools, but mixing within the same DAE may lead to less uniform performance. Best practice is to use matched drives (same type, similar speed, similar capacity) for drives in one enclosure for more predictable performance.
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