The refurbished HPE ProLiant DL380 Gen9 24-Bay 2.5" is the maximum SFF density configuration in the DL380 Gen9 family - twenty-four 2.5" hot-swap bays in the standard 2U chassis. It carries the same Intel Xeon E5-2600 v3 (Haswell-EP) or v4 (Broadwell-EP) dual-socket platform, the same 24 DDR4 DIMM slots and 3 TB memory ceiling, and the same iLO 4 management as the rest of the Gen9 line. What changes is the storage architecture: 24 SAS/SATA SSDs or HDDs deliver substantial local capacity in a single 2U host, which makes the 24-Bay the right Gen9 platform for HCI nodes (vSAN, S2D, Nutanix on KVM), high-density VDI hosts, database hosts with local primary SSD storage, and any workload where maximum local SFF capacity in one dual-socket 2U chassis is the design driver.

This page focuses on what is specific to the 24-bay variant - when maximum SFF density is the right design, and the controller, RAID, NVMe, and power decisions that change at 24 SFF. For the shared platform vocabulary, the canonical is the DL380 Gen9 16-Bay 2.5".

To configure a build, call 1-800-778-1545 or use the quote form below. Every refurbished unit ships under our 180-day warranty with 12+ hour burn-in testing, and volume pricing starts at 5 units. The 24-bay configuration benefits from extra design discussion - controller sizing, RAID layout, NVMe planning, and power budget all matter more here than at lower bay counts.

When 24 SFF Bays Is the Right Design

Most production DL380 Gen9 workloads are well served by 8 or 16 bays. The 24-Bay earns its place specifically when:

• vSAN ReadyNode at maximum density. 4-6 cache SSDs in disk groups paired with 18-20 capacity SSDs delivers substantial usable capacity per host. The DL380 Gen9 is a documented vSAN ReadyNode - verify the current VMware HCL for firmware and ESXi support at deployment time.
• Storage Spaces Direct (S2D) high-density nodes. S2D scales IOPS and capacity with drive count; 24 SSDs as 4 cache + 20 capacity, or all-flash 24-way, delivers high per-node capacity at Gen9 standardization.
• High-density VDI hosts. Citrix or Horizon environments running 100+ desktops per host benefit from the 24-bay budget for profile management, image deltas, and personal data; SFF SSDs deliver the random-IOPS profile VDI needs.
• Database hosts with local primary SSD storage. SQL Server, Oracle, or PostgreSQL hosts where the design choice is local SSD rather than SAN - 24 SAS SSDs in the right RAID layout deliver high IOPS without SAN dependency.
• Mixed NVMe + SSD tiering. The Express Bay option supports SFF NVMe positions; on the 24-bay this gives a hot NVMe tier alongside a bulk SAS/SATA SSD tier.

If 16 bays cover the workload, the DL380 Gen9 16-Bay canonical is the better economic choice at the same platform vocabulary. Pay for 24 bays specifically when the workload needs the additional storage budget.

Storage - 24 SFF Bays

Twenty-four 2.5" SAS/SATA hot-swap bays across three drive boxes (Box 1, 2, 3) in the front of the chassis. With all 24 bays populated, the Universal Media Bay (which occupies one drive-box position) is not supported - production 24-bay builds rely on iLO 4 remote management instead. Drive options span the full Gen9 SFF portfolio: SAS SSDs in mixed-use and read-intensive tiers (200 GB through 3.84 TB at launch, larger on later firmware), SATA SSDs for cost-optimized roles, 10K/15K SAS HDDs, self-encrypting drives for compliance, and NVMe via the Express Bay option in specific positions. At full population with 3.84 TB SAS SSDs the 24-bay delivers roughly 92 TB raw.

RAID at 24 SFF

• HCI (vSAN, S2D, Nutanix) - HBA pass-through. Storage redundancy lives in the HCI software, so the H241 HBA with no hardware RAID is the right pattern; disk groups and policies are configured at the HCI layer.
• Database hosts - RAID 10 across split pools. 24 SSDs as 12 mirror pairs in RAID 10 for high write performance and fast rebuild. The 50% overhead is accepted in exchange for write performance.
• VDI hosts - RAID 6 or RAID 60. Single RAID 6 (22+2) or two striped RAID 6 groups of 12 (RAID 60). RAID 60 is preferred at this drive count for rebuild-scope reduction; SSD rebuilds run in hours, not days.
• Capacity-tier SSD - RAID 6. 24x 3.84 TB SAS SSDs in RAID 6 deliver roughly 84 TB usable for a read-heavy capacity tier behind workload caching.

Boot Drives

At 24 bays, consuming 2 for boot still leaves 22 for data, but M.2 boot via the HPE M.2 enablement card or a rear-2-SFF kit is still preferred for production - it preserves all 24 front bays for the storage layer, which matters most for HCI where every front bay should be available to the software. We default to M.2 or rear-2-SFF on every HCI-context 24-Bay quote.

Storage Controllers at 24-Bay Scale

At 24 SSDs, controller cache and lane budget matter more than at lower bay counts:

• Smart Array P840ar (4 GB FBWC). The standard production controller for 24-bay hardware-RAID builds. 4 GB cache absorbs burst writes across the larger pool; full RAID 0/1/5/6/10/50/60.
• Smart Array H241 (HBA mode, PCIe plug-in). The most common 24-bay pattern, because HCI is the dominant 24-bay workload. Clean SAS pass-through.
• Smart Array P840 (PCIe plug-in, 4 GB FBWC). Same silicon as the P840ar in plug-in form - useful for dual-controller designs (one for OS/system disks, one for the 24-bay pool).
• Smart Array P440ar (2 GB FBWC). Supported, but the 2 GB cache is undersized for write-intensive 24-SSD workloads. Acceptable for read-heavy workloads only.

For HCI, multiple HBA controllers may be needed depending on backplane configuration to pass through all 24 bays; we engineer the right combination at quote time against the vSAN/S2D/Nutanix HCL. The HPE Smart Storage Battery is required with any P-series controller.

Processors

1 or 2 sockets of Intel Xeon E5-2600 v3 (Haswell-EP) or v4 (Broadwell-EP) on the C610 Grantley chipset; v3 and v4 cannot be mixed, and 2-socket is the production standard (single-socket halves DIMM slots to 12 and PCIe to 3). At 24-bay scale, HCI and VDI consolidation tend to push CPU selection higher than general-purpose 8/16-bay builds:

• E5-2680 v4 (14 cores, 120W). The mainstream production pick - 28 cores at 2S, balanced TDP, standard heatsink. Common HCI/VDI baseline.
• E5-2690 v4 (14 cores, 135W, 2.6 GHz) and E5-2699 v4 (22 cores, 145W). Higher frequency and the 44-core platform maximum respectively for high-VM-density nodes; both 120W+ ship with the high-performance heatsink.
• E5-2667 v4 (8 cores, 135W, 3.2 GHz). The per-core-licensing pick for local-SSD database hosts (Oracle, SQL Server Enterprise).
• E5-2650 v4 (12 cores, 105W). Mid-tier at modest TDP for capacity-tier or lighter HCI nodes. Haswell-EP v3 equivalents are available at lower cost with a DDR4-2133 cap.

Memory

24 DDR4 DIMM slots (12 per CPU; 12 with a single CPU). RDIMM and LRDIMM are supported but not mixable; maximum 3 TB with 128 GB LRDIMMs on v4. HPE DDR4 Smart Memory is required for rated speeds. Speed depends on generation and population: v3 caps at DDR4-2133, v4 at DDR4-2400, and full 24-DIMM population drops to DDR4-1866/1600. For 24-bay HCI and VDI nodes, 256-512 GB is typical (vSAN/S2D baselines plus VM workload); database hosts size memory to working set plus overhead. NVDIMM-N (8/16 GB) is supported on v4 for transaction-log persistence.

Networking and PCIe Expansion

Embedded HPE 4-port 1 GbE 331i standard, with the optional FlexibleLOM mezzanine for 10 GbE SFP+ (530FLR/534FLR), 10 GBASE-T, 25 GbE SFP28, or converged FlexFabric - 10/25 GbE FlexibleLOM is strongly recommended for HCI east-west traffic. PCIe expansion is 3 PCIe Gen3 slots with one CPU, expanding to 6 with both populated (the +3-slot riser requires the second CPU). Plan lane budget carefully when Express Bay NVMe is in scope, since NVMe positions consume dedicated PCIe lanes alongside HBA and FlexibleLOM cards.

GPU Support

GPU support is bounded by PCIe Gen3 and the 2U thermal envelope, and at 24 bays it competes with NVMe and HBA cards for lane and slot budget:

• Single-width accelerators. NVIDIA Tesla T4 (70W, passive) for inference or VDI graphics offload; no GPU power cable kit required.
• Double-width GPUs. Gen9-era M40/M60/K80-class cards require the high-performance heatsink and the GPU power cable kit (PN 669777-B21); plan for up to two, subject to PSU sizing and slot contention with HBAs.
• Thermal and lanes. A fully populated 24-bay plus double-wide GPUs is a dense thermal and PCIe-lane load - we validate inlet temperature and lane allocation at quote time. PCIe Gen3 bandwidth is the ceiling; PCIe Gen4 GPU workloads belong on Gen10 Plus or Gen11.

Management - iLO 4 Generation

HPE iLO 4: remote console (iLO Advanced for full graphical KVM), virtual media, IPMI, SNMP telemetry, Active Health System logging, and OneView compatibility - the same iLO 4 across the Gen9 line. Unlike Gen10's iLO 5, iLO 4 has no Silicon Root of Trust; UEFI Secure Boot is the firmware-integrity baseline, with compensating controls where a compliance framework requires platform attestation. On dense 24-bay builds with no Universal Media Bay, iLO 4 remote access covers the operational requirement the front media bay would otherwise serve. iLO Advanced is typically a separate cost and rarely optional in production; we quote it explicitly.

Power and Cooling at 24-Drive Scale

A fully populated 24-Bay with 2x E5-2680 v4, 24 DIMMs, and 24 SAS SSDs draws roughly 700-900W sustained; higher-bin CPUs (E5-2690/2699 v4) and NVMe push that to 900-1,100W. PSU sizing:

• 2x 800W Flex Slot Platinum (typical production). Covers mainstream dual-socket builds with full memory and 24 SSDs in 1+1 redundancy.
• 2x 1400W Flex Slot Platinum (high TDP). Required for E5-2699 v4 or double-wide GPU builds; supports low-line and high-line input.
• 500W - not recommended at 24 bays. Marginal for sustained 24-drive workloads; use 800W minimum.

Take redundant PSU on every 24-Bay production build - HCI, VDI, and database hosts are workloads where unplanned downtime has documented cost. We run the HPE Power Advisor and validate thermal headroom against every 24-Bay quote; ASHRAE A3 (40°C) ambient is supported with performance heatsinks, with confirmation of inlet spec per configuration.

Physical Specs & Platform Notes

• Form factor: 2U rackmount, standard-depth Gen9 enclosure; with the cable management arm installed, plan for additional rear clearance.
• PCIe expansion: up to 6 PCIe Gen3 slots with both CPUs (3 with one), split full-height and low-profile across the primary and secondary risers; the secondary riser requires the second processor. Lane budget is tighter at 24 bays once NVMe, HBA, and FlexibleLOM cards are added.
• Parts availability: excellent - one of the largest 2U install bases, so drives, PSUs, risers, heatsinks, and Smart Array controllers are widely available; third-party maintenance spares depth is strong in major metros.
• Accessories we recommend: the 2U SFF ball-bearing sliding rail kit (P/N 679365-001 / 737412-001; see the DL380 Gen9 2U SFF sliding rail kit), the HPE M.2 enablement card or rear-2-SFF kit for boot placement, and the GPU power cable kit (PN 669777-B21) on accelerator builds. The Universal Media Bay (PN 724865-B21) is not available at full 24-bay population.
• Platform notes: CPU hot-plug is not supported, and v3/v4 CPUs cannot be mixed. NVMe via the Express Bay option consumes specific front-bay positions and PCIe lanes. Confirm HCI HCL status (vSAN/S2D/Nutanix) against current firmware before committing.

Our Assessment

Where it excels: The 24-Bay is the right answer when maximum local SFF capacity in a single 2U Gen9 host is the design driver - vSAN ReadyNodes at maximum density, S2D high-density nodes, 100+-desktop VDI hosts, and database hosts that keep primary storage local on SSD rather than SAN. It is also the natural capacity-add for an existing Gen9 HCI fleet that needs another high-density node at the same platform standard.

Where to look instead: If 16 bays cover the workload, the DL380 Gen9 16-Bay 2.5" is more economical at the same vocabulary; for compute-driven workloads with networked storage, the DL380 Gen9 8-Bay 2.5"; for bulk HDD capacity, the DL380 Gen9 12-Bay 3.5". New deployments needing iLO 5, PCIe Gen4, or DDR4-2933+ should step to the DL380 Gen10 24-Bay 2.5". Dell-standardized shops should compare the Dell PowerEdge R730xd 24-Bay 2.5".

Bottom line: This is the densest SFF Gen9 host we build, and it earns its premium only when the workload genuinely needs the storage budget. The typical buyer is running HCI, high-density VDI, or local-SSD databases and is standardizing on Gen9 for cost or fleet-consistency reasons. Buy it for the storage density; if 16 bays cover you, save the money and take the canonical.

Honest Limitations

• Same Gen9 platform limits as the canonical: HPE active warranty ended, iLO 4 without Silicon Root of Trust, DDR4 speed caps, PCIe Gen3 only, FBWC battery as a wear item. See the 16-Bay canonical for the full platform detail.
• Universal Media Bay unavailable at full 24-bay population - the media bay occupies a drive-box position; production 24-bay builds use remote iLO 4 access.
• Controller choice matters more here. The P440ar 2 GB cache is undersized for write-intensive 24-SSD workloads; P840ar (4 GB) or H241 HBA is the right answer depending on whether redundancy lives in the controller or the software.
• Single-PSU operation is not a production configuration at 700W-1.1 kW sustained; take redundant PSU.
• NVMe at 24-bay scale consumes PCIe lane budget alongside HBA and FlexibleLOM; plan expansion carefully.
• HCI HCL verification is required - vSAN ReadyNode, S2D, and Nutanix status depend on specific firmware and software versions.

Workload Fit

Where to Look Instead

• 16 SFF bays sufficient? → DL380 Gen9 16-Bay 2.5" - the SFF sweet spot at lower cost.
• 8 SFF bays for compute-driven workloads? → DL380 Gen9 8-Bay 2.5" - VM nodes with networked storage.
• Bulk capacity rather than SFF performance? → DL380 Gen9 12-Bay 3.5" - LFF for backup, file servers, archive.
• A lower-cost 2U Gen9 value tier? → HPE ProLiant DL180 Gen9 LFF - cost-optimized 2U dual-socket Gen9.
• Gen10 24-Bay with iLO 5, DDR4-2933, Silicon Root of Trust? → DL380 Gen10 24-Bay 2.5".
• Dell alternative at the same 24 SFF tier? → Dell PowerEdge R730xd 24-Bay 2.5" - 2U 2S Grantley, equivalent positioning.

Ready to Configure?

Tell us the workload (HCI platform / VDI / database / capacity-tier SSD), HCI software and HCL context if relevant, CPU and core target, memory target, storage architecture (drive mix, NVMe requirement, RAID layout), controller preference (P840ar for hardware RAID, H241 for HCI/HBA), boot pattern, networking requirement (10/25 GbE FlexLOM strongly recommended), PSU model, and quantity. We respond within 24 hours with a validated configuration including HCL verification, RAID-sizing math, and HPE Power Advisor sizing. Every refurbished unit ships with the Wholesale Servers 180-day warranty and 12+ hour burn-in testing, and volume pricing starts at 5 units. Call 1-800-778-1545 or use the quote form below.