Lenovo Thinksystem DE4000H Iscsi HFA SFF - 7Y75A001WW

Lenovo 7Y75A001WW ThinkSystem DE4000H 2U24 iSCSI HFA SFF Storage Array

The Lenovo 7Y75A001WW is a 2U, 24-bay small form factor iSCSI hybrid flash array (HFA) built for small-to-medium business storage consolidation, virtualization infrastructure, and data-intensive workloads that demand enterprise reliability without the enterprise footprint. With a dual active-active controller architecture and support for both HDD and SSD in the same enclosure, it gives storage architects a practical platform for tiered storage without carving out a separate all-flash array budget.

Overview

The ThinkSystem DE4000H 2U24 SFF positions squarely in environments running VMware vSphere, Windows Server, RHEL, or SLES where you need shared block storage that won't become a bottleneck. The 2U rack chassis keeps rack-unit spend reasonable on dense deployments, and the active-active controller pair means no single controller failure drops your storage path. The storage array line from Lenovo covers a range of enclosure sizes — this 2U24 SFF sits between the compact 2U12 and the larger 4U60 LFF, making it the right call when drive count matters more than individual drive size.

Key Features

• Dual Active-Active Controllers with Cache Mirroring: Both controllers serve I/O simultaneously with automatic load balancing — you're not paying for a standby controller that sits idle. Cache is mirrored between the two, so a controller failure doesn't mean a cache loss event. Each controller carries 8 GB or 32 GB of cache (16 GB or 64 GB per system), and flash-backed cache protection with an included battery ensures writes are preserved during a power event before they flush to disk.
• 24 Hot-Swap SFF Bays, HDD and SSD Mixed: 24 small form factor bays accept both spinning HDDs and SSDs in the same enclosure, supporting up to 288 TB raw capacity. Hot-swap bays mean drive replacement happens during business hours without a maintenance window — relevant for any team running a lean IT operation.
• RAID 0, 1, 3, 5, 6, 10 plus Dynamic Disk Pools: Standard RAID levels cover most protection requirements. Dynamic Disk Pools (DDP) are worth considering for large drive counts — DDP spreads parity across all drives, which dramatically reduces rebuild times after a failure compared to traditional RAID 5/6. RAID 3 requires CLI configuration, so factor that in if your team is GUI-only.
• SSD Read Cache: Flash drives can be designated as a read cache tier for HDDs — a cost-effective way to accelerate frequently accessed data without converting the entire array to all-flash. Pairs well with mixed workloads where a subset of data sees disproportionate I/O.
• Snapshots up to 512 Targets (with optional license): Base licensing supports 128 snapshot targets; the optional software package extends this to 512, plus adds synchronous and asynchronous mirroring. Synchronous mirroring is the right pick for RPO=0 requirements; async handles geographically separated DR targets where latency makes synchronous impractical.
• Thin Provisioning (DDP Only): Allocate more virtual capacity than physical drives hold, let actual consumption grow over time. Reduces upfront drive spend on workloads with uneven growth, but note this is only available under DDP — not traditional RAID pools.
• Encryption Support (FIPS Drives Required): Drive-level encryption is available but requires optional FIPS-certified drives — the base 7Y75A001WW controller does not encrypt with standard drives. If compliance (HIPAA, FedRAMP, etc.) mandates encryption at rest, plan the drive BOM accordingly.
• Redundant 913W Hot-Swap Power Supplies: Two 913W Platinum AC PSUs (100–240V) ship standard with the 2U24 chassis. Platinum efficiency matters on 24/7 storage arrays — lower heat output and lower power draw at typical load. Both PSUs are hot-swap, so a PSU failure is a swap, not a shutdown.
• Comprehensive Management Stack: System Manager web GUI, SAN Manager standalone GUI, SSH CLI, and serial console CLI provide coverage for both day-to-day operations and initial configuration. SNMP, email, and syslog alerting means it integrates into existing NOC workflows without additional middleware. Optional Lenovo XClarity integration is available for shops already standardized on that management plane.
• Role-Based Access Control and LDAP Authentication: RBAC and LDAP tie directly into enterprise directory services — no separate local user database to maintain. SSL and SSH enforce encrypted management sessions. For regulated environments, this satisfies basic access control audit requirements without add-on software.
• Out-of-Band Management Port: Each controller provides a dedicated 1 GbE RJ-45 management port plus serial console ports (RJ-45 and Micro-USB) for out-of-band access. A separate management network keeps storage configuration traffic off the data path — the right way to architect shared storage from day one.

Integration and Compatibility

The DE4000H 2U24 connects to iSCSI network switches via standard Ethernet infrastructure — no specialized FC fabric required, which is a meaningful cost difference in SMB deployments. Supported host operating systems include Microsoft Windows Server, Red Hat Enterprise Linux, SUSE Linux Enterprise Server, and VMware vSphere. For existing Lenovo server environments, optional Lenovo ThinkSystem servers pair directly with the DE4000H using qualified HBAs and iSCSI initiators. SMI-S provider support means it registers with any SMI-S-compatible management platform without vendor-specific plugins.

The 7Y75A001WW is a controller module that installs into a compatible ThinkSystem Storage 2U24 chassis — the chassis (7Y75CTO1WW or 7Y75CTO2WW) is ordered separately. Confirm your chassis generation matches the Gen2 or Gen1 controller specification before ordering. Review the storage capacity planning guide to size drive population and RAID policy for your target workloads before committing to a controller memory tier (8 GB vs. 32 GB per controller).

Frequently Asked Questions

Q: Is the 7Y75A001WW a complete storage array or a controller-only module?

A: The 7Y75A001WW is a controller module. It installs into a Lenovo ThinkSystem Storage 2U24 chassis (ordered separately, e.g., 7Y75CTO1WW or 7Y75CTO2WW). Drives are also ordered separately. Confirm chassis generation compatibility before purchasing.

Q: What is the maximum raw storage capacity supported by the DE4000H 2U24?

A: The 2U24 SFF enclosure supports up to 288 TB raw capacity across its 24 hot-swap bays using high-capacity SFF drives.

Q: Does the DE4000H support encryption at rest?

A: Yes, but encryption requires optional FIPS-certified drives. Standard drives do not enable the encryption feature. If compliance mandates encryption at rest, you must specify FIPS drives when configuring the system.

Q: What host operating systems are supported?

A: Microsoft Windows Server, Red Hat Enterprise Linux (RHEL), SUSE Linux Enterprise Server (SLES), and VMware vSphere are all supported host operating systems.

Q: What is the difference between the 8 GB and 32 GB controller options for the 2U24?

A: The 8 GB controller provides 16 GB total system cache (mirrored across both controllers); the 32 GB controller provides 64 GB total system cache. Higher cache capacity benefits random read/write workloads with large working sets — particularly relevant for dense virtualization environments with many VMs sharing the same array.

Q: Does the DE4000H support Dynamic Disk Pools alongside traditional RAID?

A: Yes. Both DDP and traditional RAID levels (0, 1, 3, 5, 6, 10) are supported. DDP offers faster rebuild times and is required for thin provisioning. RAID 3 is configurable only through the CLI, not the web GUI.

Ted Perry

The 7Y75A001WW sits in a practical middle ground that most SMB storage conversations eventually land on: you get enterprise-grade dual active-active controllers with cache mirroring and flash-backed write protection, but you're not locked into an all-flash price point. The flash-backed cache with battery destage is the spec I tell people to pay attention to first — 16 GB or 64 GB of protected cache is a real buffer for mixed write workloads, and losing power doesn't mean losing in-flight data.

Technical Highlights:

• Dual Active-Active Controllers: Both controllers handle live I/O simultaneously with automatic load balancing — not an active-passive pair where half your hardware sits idle waiting for a failover event. Cache mirrors between the two, so controller failure doesn't produce a cache hole.
• Flash-Backed Cache Protection: The included battery ensures cache contents are destaged to flash on power loss. For write-intensive workloads (database logs, VM datastores), this is the difference between a graceful recovery and a dirty shutdown requiring fsck or VSS repair.
• Dynamic Disk Pools: DDP distributes parity across all member drives. On a 24-bay array fully populated with large HDDs, RAID 6 rebuild times can stretch to days — DDP cuts this substantially by parallelizing the rebuild across every drive in the pool. For shops with limited overnight maintenance windows, this is the right RAID architecture choice.

Deployment Considerations:

• The 7Y75A001WW is a controller module, not a turnkey array — budget for the 2U24 chassis (7Y75CTO1WW or 7Y75CTO2WW) and drives separately, and verify chassis generation matches the controller before placing the order. This trips up procurement teams who are ordering from spec sheets without cross-referencing the chassis BOM.
• Encryption at rest requires FIPS-certified drives; the controller itself does not encrypt with standard drives. If your workload has a compliance requirement for encryption at rest, lock in the drive spec before finalizing the storage BOM — retrofitting later means replacing all drives and re-initializing the array.

This controller is well-matched to VMware vSphere environments running 20–80 VMs on shared block storage where the team needs a dual-controller array with proper management tooling (web GUI, SNMP alerts, LDAP integration) but doesn't have the budget or operational complexity tolerance for a full FC SAN. The iSCSI connectivity model keeps the network infrastructure costs predictable and the skill set requirements within reach of a generalist infrastructure team.