QNAP 24-BAY Active-active Dual - ES2486DC-2142IT-128G-US

QNAP ES2486DC-2142IT-128G-US 24-Bay SAS All-Flash Dual-Controller Enterprise NAS

Overview

The QNAP ES2486DC-2142IT-128G-US is a 24-bay SAS 12Gbps all-flash enterprise NAS built around a dual active-active controller architecture — meaning both controllers handle I/O simultaneously rather than one sitting idle in standby. For workloads where storage availability is non-negotiable (surveillance video repositories, high-transaction databases, or virtualized infrastructure), that distinction matters: a controller failure doesn't interrupt operations, it just reduces headroom. Each controller runs an Intel Xeon D-2142IT 8-core processor and carries 64 GB of RDIMM DDR4 ECC memory (128 GB total across both controllers), with a headroom ceiling of 1024 GB via sixteen 64 GB DIMMs if you scale out. This is purpose-built shared storage for environments where downtime is measured in dollars per minute.

Key Features

• Dual Active-Active Controllers: Unlike single-controller or active-passive NAS systems, both controllers in the ES2486DC-2142IT-128G-US process I/O concurrently. If one controller fails, the other absorbs the full load without a storage path interruption — critical for 24/7 surveillance recording or production database workloads where even a brief failover window is unacceptable.
• Intel Xeon D-2142IT, 8-Core at 1.90–3.0 GHz (per controller): The D-2142IT is a server-class embedded Xeon with 16 threads and a 3.0 GHz turbo ceiling. Two of these across the dual-controller chassis gives you substantial compute for inline data services — deduplication, compression, snapshots — without offloading that work to separate appliances.
• 128 GB DDR4 ECC RAM (64 GB per controller), Expandable to 1024 GB: ECC protects in-flight data from bit errors — important when your storage subsystem is sitting between application servers and spinning flash. The base 128 GB is workable for most mid-sized deployments; the 1024 GB ceiling via 16 x 64 GB DIMMs means you're not forced to buy more chassis capacity just to expand the cache tier.
• 24 x 2.5-inch SAS 12Gbps SSD Bays: SAS 12Gbps delivers roughly double the per-drive bandwidth of SATA 6Gbps and supports dual-ported drives — meaning a single SSD can communicate with both controllers simultaneously. That dual-path capability is what makes the active-active controller model viable at the drive level; you're not creating a bottleneck at the backplane.
• 4x 10GbE Network Ports: Four 10GbE ports give you 40 Gbps of aggregate host-facing bandwidth. In a dual-controller deployment you'd typically bond or distribute these across both controllers for path redundancy. For a large IP camera deployment with dozens of high-bitrate streams writing simultaneously, 10GbE is the floor — not the ceiling.
• 2x PCIe Gen 3 Expansion Slots: The two PCIe Gen 3 slots let you add higher-speed network interfaces (25GbE, 40GbE) or additional host bus adapters depending on what your environment requires. This keeps the platform extensible as bandwidth demands grow rather than forcing a chassis replacement.
• 4 GB Flash Storage (per controller): The onboard flash holds the operating system and firmware, keeping the 24 drive bays fully available for user data. No drive bay is sacrificed for an OS volume.

Integration and Compatibility

The ES2486DC-2142IT-128G-US fits into environments running network video recorders or VMS platforms that demand a dedicated, high-availability storage backend rather than relying on NVR-internal storage. The SAS 12Gbps interface is compatible with enterprise SAS SSDs from major drive vendors; drive compatibility should be confirmed against QNAP's hardware compatibility list before procurement. The 10GbE ports integrate with standard 10GbE network switches and are compatible with iSCSI, NFS, and SMB/CIFS protocols depending on the configured QNAP QES operating environment. The PCIe Gen 3 slots follow standard form-factor card compatibility — verify specific card support with QNAP's compatibility documentation for your target use case. For a full view of the QNAP storage and NAS lineup, including tower and rackmount alternatives, browse the complete QNAP catalog.

Frequently Asked Questions

Q: What is active-active dual controller and why does it matter for the ES2486DC-2142IT-128G-US?

A: Active-active means both controller modules process read and write I/O simultaneously rather than one being idle in a standby role. If one controller fails, the other continues serving data without interruption. For continuous surveillance recording or database workloads, this eliminates the brief failover gap that active-passive designs have.

Q: How much RAM does the ES2486DC-2142IT-128G-US ship with and what is the maximum?

A: The system ships with 64 GB of RDIMM DDR4 ECC RAM per controller, for a combined 128 GB across both controllers. Maximum memory is 1024 GB total, achieved with 16 x 64 GB DIMMs (512 GB per controller).

Q: What drive interface does the ES2486DC-2142IT-128G-US use?

A: The 24 drive bays use SAS 12Gbps for SSD connectivity. SAS 12Gbps supports dual-ported drives, enabling both controllers to communicate with each drive simultaneously — a requirement for true active-active storage path redundancy.

Q: How many network ports does the ES2486DC-2142IT-128G-US have?

A: Four 10GbE ports are included. These provide 40 Gbps of aggregate network bandwidth and can be distributed across controllers for path redundancy in a dual-controller configuration.

Q: Can the ES2486DC-2142IT-128G-US be expanded with additional network cards?

A: Yes. Two PCIe Gen 3 expansion slots allow for additional network interface cards or host bus adapters. This enables upgrades to 25GbE or 40GbE connectivity as bandwidth requirements grow.

Q: What CPU does the ES2486DC-2142IT-128G-US use?

A: Each controller is powered by an Intel Xeon D-2142IT 8-core processor with a base clock of 1.90 GHz and a turbo frequency of up to 3.0 GHz, using a 64-bit x86 architecture with hardware floating-point support.

James Everett

The ES2486DC-2142IT-128G-US is one of the few NAS platforms in this price band that ships with genuine active-active dual controllers out of the box — not active-passive, not a marketing rebranding of standby failover. Each controller carries its own Intel Xeon D-2142IT 8-core processor and 64 GB of ECC RAM, and both are on the data path simultaneously. That architecture changes the calculus for any deployment where storage downtime has a direct operational cost.

Technical Highlights:

• SAS 12Gbps Dual-Port Drive Backplane: SAS 12Gbps at 24 bays gives you meaningful aggregate throughput headroom, but the dual-port capability is the spec that actually enables the active-active model — each SSD maintains independent paths to both controllers, so there's no single point of failure between the drive and the controller.
• 1024 GB Maximum Memory Ceiling: The base 128 GB ECC configuration ships ready for most mid-range deployments, but the 1024 GB ceiling via 16 x 64 GB DIMMs means you can scale the cache tier significantly as dataset sizes grow — without buying a new chassis.
• Dual PCIe Gen 3 Slots: These slots are your bandwidth escape valve. If the four onboard 10GbE ports become a constraint as camera counts or VM density increases, you can drop in 25GbE or 40GbE cards without replacing the platform.

Deployment Considerations:

• Active-active controller failover requires proper multipath I/O configuration on the host side — iSCSI MPIO or NFS multipath depending on your protocol. Without correct host-side multipath, you won't actually use both paths and you lose the HA benefit. Verify your VMS or hypervisor supports the required MPIO configuration before deployment.
• SAS 12Gbps SSDs carry a meaningful per-drive cost premium over SATA SSDs. Budget the drive population separately — at 24 bays of enterprise SAS SSD, drive costs will likely exceed the chassis cost depending on capacity tier.

The ES2486DC-2142IT-128G-US is the correct platform for large-scale surveillance storage backends, shared storage for VMware or Hyper-V clusters, or any environment where a storage controller failure cannot result in a service interruption — municipal video archives, casino surveillance floors, or financial data centers where uptime SLAs have contractual teeth.