Lenovo 2U12 Chassis - 7Y74A00TWW

Lenovo 7Y74A00TWW ThinkSystem DE4000H SAS Hybrid Flash Array

Overview

The Lenovo ThinkSystem DE4000H — model number 7Y74A00TWW — is a 2U rack-mount hybrid flash array engineered for enterprise storage workloads that demand high-throughput SAS connectivity without fully committing to an all-flash budget. Twelve 3.5-inch LFF drive bays deliver up to 42TB of raw capacity in a compact 2U footprint, making it a practical fit for mid-tier data center builds, video surveillance back-end storage, and secondary storage tiers in larger environments. Two Gen2 controllers with 8GB of shared cache and dual-port 12Gb/s SAS host interfaces mean this system can absorb write bursts without stalling — an important trait when surveillance platforms are writing continuous streams from dozens of simultaneous channels. Explore the Lenovo ThinkSystem storage lineup for the full portfolio context.

Key Features

• 12 x 3.5" LFF Drive Bays / 42TB Capacity: Twelve large-form-factor bays accommodate either spinning SAS/SATA HDDs or SSD acceleration tiers. At 42TB raw, a single 2U DE4000H can hold multiple weeks of high-resolution surveillance footage or serve as a dense shared-storage node for a mid-size virtualization cluster — without requiring an expansion shelf on day one.
• Dual 12Gb/s SAS Host Interface: Each controller exposes 12Gb/s SAS ports to the host side, more than doubling the 6Gb/s bandwidth of the prior generation. In practice, this eliminates the host interface as the bottleneck on sequential-read workloads like video playback, forensic exports, or large-file backup jobs.
• 4 External SAS Ports: Four external SAS ports enable direct-attach expansion or connection to SAS switches for multi-host access — useful in environments where a second server needs read access to the same storage pool without a full SAN switch investment.
• Dual Gen2 Controllers with 8GB Cache: Redundant controllers mean a single controller failure does not take the array offline — the surviving controller continues serving I/O. The 8GB cache pool (shared across both controllers) absorbs write bursts and smooths out the latency spikes that occur when HDD arrays service concurrent random I/O, such as mixed camera write and analytics read traffic.
• RAID 0, 1, 3, 5, 6, 10 Support: The full RAID menu gives architects flexibility. RAID 6 protects against dual-drive failure in large spindle pools — the right choice for a 12-drive array running 24/7 surveillance writes where rebuilds on large drives take hours. RAID 10 trades capacity for the fastest rebuild times, better suited for smaller pools where performance is the priority.
• 10 GbE Connectivity: Onboard 10GbE connectivity supports iSCSI or file-based access paths alongside the SAS fabric, allowing Ethernet-attached servers to share the same storage pool — a meaningful flexibility advantage in mixed environments where not every host has an HBA.
• FCP, SSH, SMI-S, SNMP, SSL Protocol Support: Fibre Channel Protocol (FCP) gives the array a path into FC SANs; SMI-S enables management integration with enterprise storage managers and VMS platforms that query storage health; SNMP feeds into existing NMS/monitoring stacks. SSH and SSL ensure management plane traffic stays encrypted.

Integration & Compatibility

The 7Y74A00TWW connects to SAS host bus adapters via 12Gb/s SAS and to Ethernet hosts via 10GbE for iSCSI workloads. The SMI-S protocol stack aligns with storage management frameworks used by major VMS platforms and hypervisors, simplifying integration into network video recorder environments or virtualized surveillance back-ends. SNMP support makes it compatible with standard enterprise monitoring infrastructure without requiring proprietary agents. FCP support allows the array to sit behind an existing Fibre Channel SAN fabric if your environment already has one — no forced rip-and-replace of FC switching. For teams planning out storage capacity and RAID tradeoffs, a storage planning guide can help size the array correctly against retention requirements. Pair this unit with a qualified enterprise switch if you are routing 10GbE iSCSI traffic through a shared network segment — dedicated VLANs and jumbo frames are strongly recommended for storage traffic isolation.

Frequently Asked Questions

Q: What host interface does the DE4000H 7Y74A00TWW use, and how many ports are available?

A: The 7Y74A00TWW uses 12Gb/s SAS as its host interface, with 4 external SAS ports available for host attachment or expansion connectivity.

Q: How many drive bays does the DE4000H 7Y74A00TWW have, and what is the maximum raw capacity?

A: It ships with 12 x 3.5-inch LFF (large-form-factor) drive bays and supports up to 42TB of raw capacity.

Q: Does the 7Y74A00TWW support redundant controllers?

A: Yes. The system includes dual Gen2 controllers, providing controller-level redundancy so a single controller failure does not interrupt storage access.

Q: Which RAID levels does the DE4000H 7Y74A00TWW support?

A: The array supports RAID levels 0, 1, 3, 5, 6, and 10, giving architects flexibility to balance performance, capacity efficiency, and fault tolerance based on the workload.

Q: Does the 7Y74A00TWW support Ethernet connectivity in addition to SAS?

A: Yes. The DE4000H includes 10GbE connectivity, enabling iSCSI or file-based access for Ethernet-attached hosts alongside the SAS fabric.

Q: What management protocols does the DE4000H support?

A: Supported protocols include FCP, SSH, SMI-S, SNMP, and SSL — covering enterprise SAN integration, encrypted management access, and standard NMS monitoring.

James Everett

The thing that stands out most when I look at the 7Y74A00TWW spec sheet is the dual-controller architecture paired with 12Gb/s SAS — that combination puts this array squarely in the tier where you can feed multiple high-throughput surveillance servers without the host interface becoming your ceiling. Dual Gen2 controllers with 8GB of shared cache is not a spec you see on entry-level storage, and in a 24/7 write environment like continuous video recording, that cache headroom is what keeps latency flat when write queues back up.

Technical Highlights:

• 12Gb/s SAS Host Ports (x4 External): Four external SAS ports give you enough bandwidth headroom to attach multiple hosts or daisy-chain an expansion enclosure without hitting the I/O ceiling — a real advantage over 6Gb/s arrays in environments with sustained sequential write loads.
• RAID 6 Capability on 12 Drives: With twelve spindles, RAID 6 is the responsible default for surveillance storage — it survives two simultaneous drive failures, and at 42TB raw you have enough capacity after parity overhead to run meaningful retention periods without adding a shelf.
• SMI-S + SNMP Management Stack: SMI-S is what lets enterprise VMS platforms and hypervisor managers query array health natively. If your monitoring infrastructure already speaks SNMP, the DE4000H drops in without requiring proprietary agents or out-of-band management appliances.

Deployment Considerations:

• If you are routing iSCSI traffic over the 10GbE interface on a shared network, isolate storage traffic on a dedicated VLAN and enable jumbo frames (MTU 9000) on the switch — mixing storage and general LAN traffic on the same segment will degrade throughput under sustained load.
• The 8GB controller cache is shared across both controllers; if you are running very large random I/O workloads alongside sequential video writes, monitor cache hit ratios early in deployment — the cache is appropriately sized for mixed sequential workloads but can be pressured by high-IOPS random patterns simultaneously.

This array is a solid match for a mid-tier surveillance back-end where a single 2U unit needs to serve 2–4 recording servers via direct-attach SAS, hold multiple weeks of high-resolution footage, and survive a drive failure without pulling a system offline — exactly the operational profile of a municipal or campus-wide camera deployment running 64–128 channels.