Dual active-active controllers
Two controllers can provide services for high availability and load distribution.
A 2U, 24-bay dual-controller enterprise QES NAS with 2.5-inch SAS 12Gb/s storage, 48GB ECC memory per controller and four 10GbE SFP+ ports per controller.

Both controllers can provide services rather than leaving one controller idle. The supplied description recommends multiple storage pools with ownership distributed across both controllers for simultaneous output and load balancing.
The supplied description states that QES 2.1.1 is pre-installed and uses ZFS, with block-based inline deduplication, inline compression, near-limitless snapshots and SnapSync.
Twenty-four 2.5-inch SAS 12Gb/s bays support the supplied SAS drive types. L1 ARC uses RAM, L2 ARC uses SSD and the ZIL write cache uses NVRAM with Copy To Flash protection.
Each controller includes four 10GbE SFP+ ports and two PCIe Gen 3 x8 slots. The supplied description lists compatible 10GbE and 25GbE expansion adapters.
The supplied information lists VMware vSphere 6.5, Windows Server 2019, Citrix XenServer 7.0 and OpenStack cloud environments, along with mission-critical file server, VDI, video streaming, surveillance, backup and recovery applications.
Answers below are based on the supplied information for QNAP ES2486dc-2142IT-96G.
It is a 2U, 24-bay dual-controller enterprise QES NAS with 2.5-inch SAS 12Gb/s storage.
It has two active-active controller modules.
The supplied specification lists an Intel Xeon D-2142IT 8-core 1.90GHz processor, up to 3.0GHz.
Each controller includes 48GB RDIMM DDR4 ECC memory, for 96GB across both controllers.
The supplied specification lists 2.5-inch SAS or SATA hard disk drives and solid state drives in the 24 bays.
Yes. The supplied specification states that SATA HDDs or SSDs require a QDA-SA3 adapter when installed in the 2.5-inch SAS drive bays.
Each controller includes four 10GbE SFP+ ports, providing eight ports across both controllers.
The supplied specification lists L1 ARC read cache in RAM, L2 ARC read cache on SSD and ZIL write cache using NVRAM with Copy To Flash protection.
The supplied description lists block-based inline deduplication, inline compression, near-limitless snapshots and SnapSync.
The supplied information lists VMware vSphere 6.5, Windows Server 2019 and Citrix XenServer 7.0, with OpenStack cloud compatibility.
The supplied specification marks the drive bays as hot-swappable and also lists hot-swappable redundant power and fan modules.
The supplied specification lists a five-year QNAP manufacturer warranty.
(ES2486dc-2142IT-96G)
QNAP ES2486dc-2142IT-96G 24-Bay Dual-Controller Enterprise ZFS NAS
Two controllers can provide services for high availability and load distribution.
Twenty-four 2.5-inch SAS 12Gb/s bays support the supplied SAS/SATA HDD and SSD types.
48GB RDIMM DDR4 ECC memory is listed per controller.
Four 10GbE SFP+ ports are included per controller.
The supplied description lists inline deduplication, compression, snapshots and SnapSync.
Two PCIe Gen 3 x8 slots are provided per controller.
Technical information below is organised from the supplied product data.
| Specification | Details |
|---|---|
| Controllers, Processor and Memory | |
| Controller Modules | 2 |
| CPU | Intel Xeon D-2142IT 8-core 1.90GHz processor, up to 3.0GHz |
| CPU Architecture | 64-bit x86 |
| Encryption Engine | AES-NI |
| System Memory | 48GB RDIMM DDR4 ECC per controller |
| Maximum Memory | 1024GB (16 x 64GB) total; 512GB (8 x 64GB) per controller |
| Memory Slots | 16 x RDIMM/LRDIMM DDR4 total; 8 x RDIMM/LRDIMM DDR4 per controller. Use only one DIMM type at a time; do not mix RDIMM and LRDIMM. |
| Storage and Cache | |
| Drive Bays | 24 x 2.5-inch SAS 12Gb/s, backward-compatible with SAS 6Gb/s |
| Drive Compatibility | 2.5-inch SAS/SATA hard disk drives; 2.5-inch SAS/SATA solid state drives. A QDA-SA3 adapter is required when installing SATA HDDs or SSDs. |
| Hot-Swappable | Yes |
| SSD Cache Acceleration | Yes; L1 ARC read cache: RAM; L2 ARC read cache: SSD; ZIL write cache: NVRAM (C2F) |
| Copy To Flash Cache | 1 per controller, 64GB M.2 SSD |
| Networking | |
| Gigabit Ethernet | 3 x RJ45 ports per controller; one port is assigned for remote management |
| 10 Gigabit Ethernet | 4 x 10GbE SFP+ ports per controller |
| Wake on LAN | Yes |
| Jumbo Frame | Yes |
| Expansion and Connectivity | |
| PCIe Slots | 2 per controller; Slot 1 PCIe Gen 3 x8 (CPU); Slot 2 PCIe Gen 3 x8 (CPU). Supported card dimensions: 215 x 68.9 x 18.76mm. Wider cards can be installed if the next PCIe slot is not used. |
| USB Ports | 2 x USB 3.2 Gen 1 ports per controller. For engineering purposes only; external storage drives or UPS units are not supported. |
| Physical Specifications | |
| Form Factor | 2U rackmount |
| LED Indicators | System power LED; system status LED; two-digit LCD status display for JBOD connection status |
| Buttons | Power and reset |
| Dimensions (H x W x D) | 88.3 x 446.2 x 504.1mm |
| Net Weight | 23.4kg |
| Gross Weight | 27.4kg |
| Power and Cooling | |
| Power Supply | Redundant hot-swappable power supply; input 90-264VAC; 700W |
| Typical Operating Power Consumption | 579.59W; tested with drives fully populated |
| Fans | Hot-swappable fan module, 60 x 60 x 38mm, 16000RPM, 12V, 2.8A x 3 |
| System Warning | Buzzer |
| Operating Environment | |
| Operating Temperature | 0-40°C (32-104°F) |
| Storage Temperature | -20-70°C (-4-158°F) |
| Relative Humidity | 5-95% RH non-condensing; wet bulb 27°C (80.6°F) |
| Warranty, Connections and Standards | |
| Standard Warranty | 5 years |
| Maximum Concurrent CIFS Connections | 10,000 with maximum memory installed |
| Safety Standards | FCC Class A (USA only); CE Mark (EN55022 Class A, EN55024); EN60950; BSMI; VCCI; CB; LVD |
| SKU | ES2486dc-2142IT-96G |
| Model # | ES2486dc |
| Barcode # | 885022018536 |
| Brand | QNAP |
| Shipping Weight | 32.8700kg |
QNAP ES2486dc-2142IT-96G is supplied with a 5 years QNAP manufacturer warranty.
Warranty coverage, eligibility and claim handling are subject to QNAP terms and product assessment. Please retain your DeviceDeal tax invoice as proof of purchase.
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