The refurbished HPE ProLiant DL360 Gen9 4-Bay 3.5" is the large-form-factor (LFF) member of HPE's Gen9 1U dual-socket line: four 3.5" SAS/SATA hot-swap bays in a 1U chassis. It carries the same Intel Grantley platform as the rest of the family, Intel Xeon E5-2600 v3 (Haswell-EP) or v4 (Broadwell-EP) on the C610 chipset, 24 DDR4 DIMM slots with a 3 TB ceiling, HPE modular Smart Array controllers, the FlexibleLOM mezzanine, and iLO 4 management. What is specific to this variant is the form factor: four LFF bays in 1U is a deliberately narrow combination that pairs high rack density with bulk-capacity HDD storage for edge, branch, ROBO, and backup roles where both rack space and capacity matter.

This page covers what changes on the LFF chassis: the workloads where 1U LFF is the right tool, the RAID math at four large-capacity drives, and the storage decisions that differ from the SFF configurations. The shared compute, memory, networking, and management platform is the same across every DL360 Gen9 chassis; for the full platform reference, the DL360 Gen9 8-Bay 2.5" is the primary page for the family.

To configure a build, call 1-800-778-1545 or use the quote form below. Every refurbished unit ships under our 180-day warranty after a 12+ hour burn-in test, and volume pricing starts at 5 units.

When 1U LFF Is the Right Combination

1U LFF is a narrow configuration on purpose. Most LFF workloads run on 2U or 4U platforms with twelve or more bays for capacity scaling, and most 1U workloads run SFF for performance per bay. The DL360 Gen9 4-Bay 3.5" earns its place only when both 1U rack density and large-format HDD capacity are genuine requirements at the same time:

• Edge compute with bulk local storage. Edge sites running analytics preprocessing, IoT collection, or video work that also need local capacity for staging before central upload. Four 8 TB to 12 TB NL-SAS drives deliver roughly 24 TB to 36 TB raw in 1U of rack space.
• Branch office multi-role servers. A single 1U box running AD, DNS, DHCP, file shares, print, and modest local virtualization. Four LFF bays in RAID 6 or RAID 10 cover branch-scale file capacity without a separate storage chassis.
• ROBO file servers at 1U density. Regional and satellite offices with hard rack-space limits, where a 1U compute-plus-storage box covers most branch infrastructure on one server.
• Remote backup targets. Backup repositories at sites where a 2U-or-larger storage box does not fit the rack envelope. Four high-capacity NL-SAS drives in RAID 6 hold a useful branch retention window.
• Small to mid-scale surveillance NVR. Camera counts that fit within four LFF drives of retention, where the recorder shares the rack with other 1U gear.
• Lab, dev, and test bulk storage. Lower-priority capacity where 1U cost and density matter more than scale.

If four LFF bays are enough and 1U density is the constraint, this configuration does real work. If bulk capacity is the primary driver and 1U is not required, the DL380 Gen9 12-Bay 3.5" at 2U is the better fit, with three times the bay count for twice the rack space.

Storage - 4 LFF Bays

Four 3.5" SAS/SATA hot-swap bays sit across the front of the 1U chassis. NVMe options are limited on the LFF chassis; the Express Bay NVMe support lives on the SFF DL360 Gen9 variants. When a 1U LFF build needs some flash alongside HDD capacity, the practical patterns are LFF SSDs in 3.5" carriers or an M.2 SATA SSD on a PCIe enablement card for the boot and high-performance tier. At full population, four LFF bays reach roughly 56 TB raw with 14 TB drives, before RAID overhead.

The drive portfolio spans the full Gen9 LFF range:

• NL-SAS HDDs. The bulk-capacity workhorse: 4 TB through 14 TB MDL drives at 7,200 RPM, optimized for sequential throughput and capacity per dollar.
• 10K and 15K SAS HDDs. Higher per-drive IOPS than NL-SAS at a lower capacity ceiling: 10K LFF tops near 2.4 TB, 15K LFF near 900 GB.
• LFF SSDs. SAS or SATA SSDs in 3.5" carriers. Rarely the efficient choice on form factor alone, but valid when LFF is locked in for chassis reasons.
• Self-encrypting drives (SED). Available for compliance-regulated bulk storage.

RAID at 4 LFF

RAID layout at four LFF drives works differently than at twelve, because the small bay count changes the overhead math:

• RAID 10 (two mirrored pairs, striped). 50 percent overhead, roughly 24 TB usable with 12 TB drives. Our usual default at exactly four drives: the overhead is identical to RAID 6 but write performance is better and the rebuild scope is smaller.
• RAID 6 (dual parity). Same 50 percent overhead at four drives, roughly 22 TB usable with 12 TB drives. Preferred when read capacity matters more than write speed; dual parity protects against a second drive failing during the multi-day rebuild that large LFF drives require.
• RAID 5 (single parity). 25 percent overhead, roughly 36 TB usable with 12 TB drives, but not recommended at LFF capacity: single parity across multi-day rebuild windows is high risk. We will quote it on explicit request and flag the risk in writing.
• JBOD / HBA pass-through. When the storage abstraction lives in software (ZFS, software-defined NAS), the H240ar HBA is the right controller.

Boot Drives

The 4-Bay LFF chassis has a boot problem: two of four bays for a mirrored OS volume is 50 percent of the storage budget, which is rarely acceptable. M.2 SATA on the HPE M.2 SSD enablement card is the answer on essentially every 4-Bay LFF production build, since it puts boot in a PCIe slot and preserves all four LFF bays for data. Front-bay boot is a fallback only when two bays of data are genuinely sufficient, and a single unmirrored boot drive is not a production pattern. We default to M.2 boot on every 4-Bay LFF quote and confirm the PCIe slot allocation accordingly.

Storage Controllers

The same HPE modular Smart Array family runs here, with selection skewed toward the cache sizing a four-drive bulk-storage workload actually needs:

• Smart Array P440ar (2 GB flash-backed write cache, battery-backed). The right production controller at four LFF; the 2 GB cache is comfortably sized for a four-drive array. Mounts in the modular slot without consuming a PCIe slot.
• Smart Array H240ar (HBA / pass-through). For software-defined NAS or ZFS file servers that want raw disks rather than hardware RAID.
• Smart Array P840 (4 GB flash-backed write cache, battery-backed). Available for write-intensive needs, but rarely required at four LFF; the P440ar is usually sufficient.
• B140i (embedded software RAID via the chipset). Acceptable for boot mirroring only; not a production data-RAID controller on a dual-socket platform.

All P-series controllers require the HPE Smart Storage Battery for write-back caching, and the flash-backed cache module is a wear item we verify and replace as part of build prep on any refurbished unit.

Processors

One or two sockets of Intel Xeon E5-2600 v3 (Haswell-EP) or v4 (Broadwell-EP) on the Grantley C610 platform, drop-in compatible within the socket but not mixable in one server. Core counts reach 18 per CPU on v3 and 22 per CPU on v4, with TDPs from roughly 55 W to 145 W. Bulk-storage roles rarely need the top bins, so CPU selection on this variant usually skews lower than on a dense SFF compute node:

• E5-2620 v4 (8 cores, 85 W). The common branch and edge pick; 16 cores across two sockets is plenty for file and infrastructure roles, and the low TDP sits easily inside the 1U envelope.
• E5-2640 v4 (10 cores, 90 W) or E5-2650 v4 (12 cores, 105 W). Mid-tier choices when the box runs compute alongside the storage role.
• E5-2680 v4 or higher. Reserved for consolidated branch or edge-analytics builds that pair four-LFF storage with meaningful compute.

Top-bin CPUs still require the performance heatsink and high-performance fan kit, and a single-socket build exposes only 12 of the 24 DIMM slots and half the PCIe lanes, so the second socket matters whenever memory or expansion does.

Memory

24 DDR4 DIMM slots, 12 per CPU. The platform ceiling is 3 TB with 128 GB LRDIMMs; RDIMM is the mainstream choice, with 64 GB to 128 GB total covering most branch and edge bulk-storage workloads. ZFS-based file servers are the exception and benefit from more memory (128 GB to 256 GB) for ARC cache. Speed is population-dependent: DDR4-2400 on v4 and DDR4-2133 on v3 at one DIMM per channel, stepping down a tier at full two-DIMM-per-channel population. HPE Smart Memory is required for rated speeds; third-party DIMMs may train slower or fail to post. This platform predates Intel Optane persistent memory, so PMem is not part of the conversation here.

Networking and PCIe Expansion

Networking runs through the FlexibleLOM mezzanine, so the network personality is a build choice that does not cost a PCIe slot. For bulk-storage roles, 10 GbE FlexibleLOM (the 530FLR-SFP+ or 534FLR-SFP+ dual-port adapters) is the sensible default on backup-target and edge-analytics builds, while the 331FLR quad-port 1 GbE is acceptable for a pure branch file server. PCIe expansion is the 1U constraint: up to three PCIe Gen3 slots with both CPUs populated, and on this variant one of them is usually committed to the M.2 boot card. When more expansion than that is needed, the 2U DL380 Gen9 is the right move.

GPU Support

GPU support in the 1U envelope is limited to single-width, low-profile cards within the chassis power and thermal budget; there is no room for double-wide accelerators. On a bulk-storage LFF build a GPU is rarely part of the spec, but for the edge-analytics case a single low-profile accelerator such as an NVIDIA T-series card fits. Anything heavier (double-wide, multi-GPU, or high per-card power) belongs in the 2U DL380 Gen9 rather than this chassis.

Management - iLO 4 Generation

The DL360 Gen9 uses iLO 4. iLO Standard is included for health monitoring, power control, and basic remote access; iLO Advanced is the licensed tier for full graphical remote console, virtual media, and remote KVM, and it is usually quoted separately, which matters for lights-out edge and branch sites where remote hands are scarce. Intelligent Provisioning handles firmware and driver deployment, and the Active Health System log is the first place to check a refurbished unit's history. On security, iLO 4 predates the Silicon Root of Trust introduced on Gen10; UEFI Secure Boot is the firmware integrity baseline, and a TPM module is available where a hardware root is required.

Power and Cooling

Power comes from HPE Flex Slot hot-plug supplies in 500 W, 800 W, and 1400 W ratings at Platinum and Titanium efficiency, configured 1+1 for redundancy. Four LFF HDDs draw less storage-tier power than eight to ten SAS SSDs, so an 800 W pair is the standard production choice and 500 W is adequate for an entry-tier branch build on E5-2620-class CPUs. For edge sites without a rack UPS, the HPE Flex Slot battery backup module is worth adding for short power-event ride-through. Thermally the 1U chassis supports ASHRAE A3 (40 C) and A4 (45 C) inlet ranges; LFF HDDs run cooler than dense SSD arrays, and the wider ambient range helps at edge sites without dedicated cooling. We target a 25 C to 30 C inlet on production deployments.

Physical Specs & Platform Notes

• Form factor: 1U rack chassis, standard depth for four-post racks, with the usual rear allowance for cable management.
• PCIe expansion: up to three PCIe Gen3 slots with both CPUs populated, low-profile only; one slot is typically committed to the M.2 boot card on this variant.
• Parts availability: excellent. Gen9 LFF drives, controllers, FlexibleLOM adapters, PSUs, and rails are deep on the secondary market. HPE active warranty support has ended, and third-party maintenance is the standard production support path in 2026.
• Accessories we recommend: the HPE 1U ball-bearing sliding rail kit (P/N 679368-001 / 728437-001) for the DL360 Gen9 chassis, a cable management arm, and the HPE M.2 SSD enablement card so boot stays off the four LFF bays.
• Platform notes: M.2 boot is effectively mandatory here to avoid spending half the bays on the OS; CPU hot-plug is not supported; LFF rebuild windows run into days at production load, so plan RAID 10 or RAID 6 rather than RAID 5; and NVMe is not a practical option on the LFF chassis.

Our Assessment

Where it excels: This is the configuration for the genuine 1U-plus-LFF case: edge compute nodes that need local bulk storage, branch and ROBO servers consolidating file and infrastructure roles, small backup targets and surveillance recorders where a 2U storage box will not fit the rack. Four high-capacity NL-SAS drives in RAID 10 or RAID 6, an M.2 boot device, and a low-TDP dual-socket CPU pairing make a capable, rack-efficient branch server.

Where to look instead: If bulk capacity is the real driver and 1U is not a hard constraint, the DL380 Gen9 12-Bay 3.5" gives three times the bays at 2U. If SFF SSD performance matters more than LFF capacity, the DL360 Gen9 8-Bay 2.5" is the standard 1U compute build, and the DL360 Gen9 10-Bay 2.5" is the densest SFF option. For current-generation 1U LFF with iLO 5, the DL360 Gen10 4-Bay 3.5" is the step up.

Bottom line: A niche but useful build for the IT team that has decided, for good rack-space reasons, that bulk storage has to live in 1U. It is the right tool for edge, branch, ROBO, and small backup roles, and the wrong tool the moment capacity scaling or SFF performance becomes the priority. Size the four-bay capacity ceiling against the deployment's growth before committing, because field expansion past four LFF bays means a different chassis.

Honest Limitations

• Only four LFF bays: the raw capacity ceiling is roughly 56 TB with 14 TB drives, less after RAID. Capacity-led builds belong on the DL380 Gen9 12-Bay LFF.
• Boot consumes 50 percent of the bays in the front, so M.2 boot is effectively mandatory.
• LFF rebuild times run into days at production load; RAID 10 or RAID 6 strongly preferred, RAID 5 is high risk at this capacity.
• NVMe is not a practical option on the LFF chassis; for NVMe at 1U Gen9, use the SFF 8-Bay or 10-Bay variants.
• iLO 4 management, without the Silicon Root of Trust hardware attestation introduced on Gen10.
• DDR4 speed caps at DDR4-2400 (v4) or DDR4-2133 (v3) and steps down under full DIMM population; HPE Smart Memory required for rated speeds.
• PCIe Gen3 only, three slots in 1U, with one usually committed to the M.2 boot card.
• No double-wide GPU support in 1U; single-width low-profile accelerators only.
• HPE active warranty has ended; production support is via third-party maintenance.

Workload Fit

Where to Look Instead

• Need more LFF bays? The DL380 Gen9 12-Bay 3.5" is the 2U LFF platform for backup, file serving, and archive at scale.
• Need SFF performance in 1U Gen9? The DL360 Gen9 8-Bay 2.5" is the standard 1U compute build, and the DL360 Gen9 10-Bay 2.5" is the densest SFF option.
• Need current-generation 1U LFF with iLO 5? The DL360 Gen10 4-Bay 3.5" is the direct generational step up.
• Working to the tightest budget on a 1U Gen9 LFF build? The DL160 Gen9 4-Bay 3.5" is the value-tier 1U Gen9 step down.
• Standardized on Dell? The Dell PowerEdge R630 10-Bay 2.5" is the equivalent 1U dual-socket Grantley platform from the same generation.

Ready to Configure?

Tell us the workload (edge compute, branch file server, ROBO, remote backup, or surveillance NVR), the drive capacity target (8, 10, 12, or 14 TB), the RAID layout (RAID 10 or RAID 6 are the usual picks at four drives), the controller preference, the M.2 boot configuration, the FlexibleLOM choice (1 or 10 GbE is typical here), the PSU configuration, and the quantity. We respond within 24 hours with a validated configuration including drive-capacity verification, RAID sizing math, and HPE Power Advisor sizing. Every refurbished unit ships with the Wholesale Servers 180-day warranty after a 12+ hour burn-in test, and volume pricing starts at 5 units. Call 1-800-778-1545 or use the quote form below.