Lenovo 2U24 Chassis - 7Y75A00TWW

Lenovo 7Y75A00TWW ThinkSystem DE4000H Hybrid 2U24 SFF Controller Enclosure

Overview

The Lenovo ThinkSystem DE4000H 2U24 SFF Controller Enclosure — model 7Y75A00TWW — is an entry-level hybrid storage array built for organizations that need a scalable, rack-mountable shared storage platform without the cost and complexity of an all-flash or enterprise-tier system. Fitting in 2U of rack space with 24 Small Form Factor (SFF) drive bays, this enclosure is designed for environments where mixed workloads, growth headroom, and multi-protocol connectivity matter more than raw peak throughput. If your team is standing up a new storage fabric for a virtualized server cluster, a surveillance archive tier, or a growing data center edge deployment, the DE4000H gives you a solid foundation that can scale capacity as demand increases.

Key Features

• 24 SFF Drive Bays in 2U: Packing 24 Small Form Factor bays into a 3.3" H x 17.7" W x 21.8" D chassis means you can reach meaningful raw capacity without consuming excessive rack real estate. For a deployment where rack space is charged back by the unit, this density matters — fewer Us dedicated to storage means more available for compute.
• 32GB Controller Memory: The onboard 32GB of controller memory provides substantial cache headroom for read and write acceleration. On mixed workloads — sequential surveillance data alongside transactional reads — a larger cache reduces the number of physical I/Os that reach spinning media, which directly improves latency consistency under load.
• Dual-Protocol Connectivity — 16Gb Fibre Channel and SAS 12Gb/s: Supporting both 16Gb FC and SAS 12Gb/s gives you flexibility in how this enclosure integrates into your existing fabric. FC connects directly into SAN infrastructure for block-level shared storage across multiple hosts; SAS 12Gb/s allows direct-attach or expansion scenarios. If your environment already has FC switches deployed, this enclosure slots in without requiring a full fabric rebuild.
• Hybrid Architecture: The DE4000H is explicitly designed as a hybrid array — meaning it supports a mix of SSD and HDD media in the 24 SFF bays. This lets you tier storage economically: SSDs for hot data or write-intensive workloads, HDDs for warm or archive data. You control the balance based on your actual I/O profile, rather than paying for all-flash capacity you don't need.
• Scalable Entry-Level Design: The DE4000H series is positioned as an entry-level system, which is a meaningful designation. It means the management interface, feature set, and licensing model are calibrated for organizations that don't have a dedicated storage engineering team. Provisioning and configuration are designed to be accessible without deep SAN expertise, which reduces time-to-productive on initial deployment.
• 2U Rack Form Factor: At 2U, this enclosure integrates into standard 19-inch racks alongside compute and networking gear. The physical dimensions (3.3" H x 17.7" W x 21.8" D) are within normal tolerances for dense rack layouts — verify your rail kit and cable management depth before ordering, as 21.8" depth requires adequate rear clearance for cabling and airflow.

Integration and Compatibility

The 7Y75A00TWW is part of Lenovo's Lenovo ThinkSystem storage line and integrates into existing enterprise storage systems infrastructure via its dual 16Gb Fibre Channel and 12Gb SAS connectivity options. For organizations planning a SAN fabric build or expansion, the FC ports attach directly to FC switches without protocol translation. The SAS 12Gb/s interface supports direct-attach configurations for single-host deployments or expansion enclosures for capacity scale-out. When selecting drives, verify compatibility with Lenovo's qualified drive list for the DE4000H series — using non-qualified drives in a shared storage array is a common source of firmware and support complications. For full rack integration planning, refer to rack enclosure and rail accessories to ensure mounting hardware matches your rack standard.

Frequently Asked Questions

Q: What is the drive bay capacity of the 7Y75A00TWW?

A: The 7Y75A00TWW includes 24 Small Form Factor (SFF) drive bays in a 2U chassis, supporting a mix of SSD and HDD media for hybrid storage configurations.

Q: What connectivity interfaces does the DE4000H 2U24 enclosure support?

A: The enclosure supports 16Gb Fibre Channel and SAS 12Gb/s, allowing integration into existing SAN fabrics via FC or direct-attach and expansion via SAS.

Q: How much controller memory does the 7Y75A00TWW include?

A: The controller is equipped with 32GB of memory, which provides cache capacity to accelerate mixed read/write workloads and reduce latency on active data sets.

Q: What are the physical dimensions of the DE4000H 2U24 enclosure?

A: The enclosure measures 3.3" H x 17.7" W x 21.8" D and mounts in a standard 2U rack position. Verify rear rack clearance before installation, as the 21.8" depth requires adequate space for cabling.

Q: Is the 7Y75A00TWW a controller enclosure or a drive expansion unit?

A: The 7Y75A00TWW is a controller enclosure — it includes the storage controller with onboard FC and SAS connectivity. Drive expansion shelves are separate and attach to this unit to increase raw capacity beyond the 24 onboard SFF bays.

James Everett

The 7Y75A00TWW is one of those platforms I recommend when a team needs shared block storage but isn't ready to commit to all-flash pricing or the operational overhead of an enterprise-tier SAN. The 32GB of controller cache is the spec I always point to first — that's a meaningful buffer for the mixed I/O patterns you see when a virtualized cluster is running both active workloads and background replication or archival writes simultaneously.

Technical Highlights:

• 24 SFF Bays / 2U: Maximum bay density per rack unit for an entry-level hybrid system — keeps your storage footprint contained while leaving room to populate bays incrementally as capacity demand grows.
• 16Gb Fibre Channel: Connects directly into existing FC SAN fabrics at 16Gb line rate — no FC-to-iSCSI gateway needed, which eliminates a potential latency and failure point in environments that already have FC infrastructure.
• Hybrid Media Support: SSD + HDD coexistence in the same 24-bay chassis lets you allocate hot-tier and warm-tier storage without deploying separate enclosures — operationally simpler and more cost-effective than a two-enclosure tiered approach at this scale.

Deployment Considerations:

• At 21.8" depth, confirm your rack has adequate rear clearance before racking — FC and SAS cabling on a fully populated unit adds another 4–6 inches of practical depth behind the enclosure face.
• This is a controller enclosure, not a JBOD — do not confuse it with expansion shelves. If your capacity plan requires more than 24 SFF drives, you'll need to add a compatible expansion enclosure and verify the DE4000H controller's maximum drive count ceiling before sizing your design.

For a virtualized server cluster at a regional data center edge site — where a small IT team needs reliable shared block storage across 4–8 hosts without a dedicated storage admin — the DE4000H in this 2U24 configuration is a practical fit: enough controller memory to handle burst workloads, dual-protocol connectivity for future fabric flexibility, and a manageable operational profile that doesn't require specialized SAN expertise to maintain day-to-day.