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QNAP ES1686dc

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Next-generation enterprise-class high-availability ES1686dc Enterprise ZFS NAS with IntelR XeonR D dual active-active backup architecture, DDR4 ECC memory up to 512 GB, supporting SAS 12Gb /s High-speed data transfer interface with ZFS file system combined with logical disk management. The ES1686dc is equipped with the latest QES 2.1.0 operating system, which supports advanced functions such as near-instant snapshot (Snapshot), remote snapshot synchronization (SnapSync), block level data deduplication and instant data compression. Whether it's high-availability file servers, virtual servers, desktop virtualization, medium-sized databases, online video streaming, digital surveillance storage, and efficient file backup and offsite backup, the ES1686dc is perfect for robust performance. With high availability running flawless.

The IntelR XeonR D dual-control backup design provides a highly reliable and highly available storage solution without fear of a single point of failure.
DRAM write cache and Flash read acceleration with BBU battery data protection for ultra-high random write performance.
With 2 M.2 SSD ports, you can configure SSD cache for great performance.
Built-in four 10GbE SFP+ networks, large bandwidth accelerated virtualization applications, large file sharing, and dense data transfer.
Nearly unlimited snapshots are synchronized with SnapSync snapshots to help organizations build recovery plans in the shortest amount of time.
Complete VMwareR vSphereR 6.5, Windows ServerR 2016 and CitrixR XenServerR 7.0 virtualized storage applications with support for OpenStackR block storage.

Active-Active balances storage performance with high availability

Dual Active Controller (Active-Active) The storage system architecture with two controllers providing services simultaneously. Unlike the single-ended Active-Standby architecture, which has only a single controller activity, the dual-active architecture has no shortcomings of computing resources being idle. In order to fully utilize the advantages of the ES1686dc dual-active controller architecture, it is recommended that users can create multiple storage pools and evenly distribute the storage pools to two controllers, so that the advantages of dual-active controller architecture load balancing can be realized.

Active-Standby single-ended backup architecture
A high-availability system requires twice the cost of the system and hard drive. The data load is also handled only on Active systems, resulting in unbalanced system load. In addition to the risk of loss of power outage data, network disconnection will also invalidate the highly available architecture.

Active-Active Dual Active Controller Architecture
There is no need to buy two systems at twice the cost. Both ES1686dc controllers provide data access services with C2F (Copy-To-Flash) and dual-path SAS interfaces with power-down data protection. In addition to not wasting valuable computing resources, it can also provide high-speed, high-availability storage services through SMB, NFS, iSCSI and other communication protocols.

IntelR XeonR D dual-control architecture for highly available services with near-stop performance

Built for the data center, the ES1686dc is equipped with two high-performance IntelR XeonR D processors that support dual active-active. When one controller fails, the other controller can take over immediately and automatically. Fault controller all work; equipped with auxiliary heat exchange components (including controllers, fans, power supplies, hard drives) and controllers with Failover / Failback functions, providing enterprises without High availability for downtime. The ES1686dc and JBOD storage expansion unit ( EJ1600 v2 ) also supports the dual-loop architecture of the Mini-SAS Dual Path redundancy design. Even if one of the JBOD cables is damaged, the system can be transported normally. ES1686dc's multi-protection mechanism helps companies through every critical moment.

Multi-layer cache with both read and write: up to 512 GB of main memory with SSD read/memory ZIL write cache

ES1686dc supports both main memory read cache (L1 ARC), SSD read cache (L2 ARC), and memory write cache (ZFS Intent Log) to meet the performance needs of different enterprise applications.

Memory can be expanded to 512 GB

The single-sided controller provides a total of eight RDIMM slots for memory capacity up to 512 GB.
Note: The system will retain 8GB of memory for use as a cache.

M.2 SSD cache

Built-in 2 M.2 SSD ports, support PCIe Gen3 x4 or SATA 6Gb/s SSD, flexible configuration SSD cache, improve data read and write cache performance.
Note: Shipment does not contain M.2 SSD

C2F implements data write zero risk

The system memory is equipped with a backup battery unit (BBU) protection, and the Copy To Flash (C2F) cache ensures that the data in the memory and the ZFS Intent Log (ZIL) can be retained when the system is powered off and after the power is restored. Reply to avoid data corruption.
Note: To ensure data writing security, it is recommended to replace the BBU once a year.

PCIe flexible expansion, immediately upgrade 40GbE rapid experience

The ES1686dc features two PCIe Gen3 x8 expansion slots from the CPU to flexibly configure 10GbE / 40GbE NICs for your needs, meeting the high-speed network requirements for virtualized applications, streaming video, and high-bandwidth business services; installing the MellanoxR SmartNIC network The road expansion card also supports the iSER offload capability. Install the QM2-4P-384 expansion card to add four additional M.2 2280 PCIe NVMe SSD slots for faster read speeds. SAS-12G2E can also be installed to cascade up to 7 units. EJ1600 v2 storage expansion device with hard disk , with 48Gb/s high-speed data transmission performance, can expand the total storage space by more than 1 PB without stopping the machine.

Key enterprise-level dual-control backup design: high-speed, uninterrupted, high-availability storage services

"Reliability" is the number one priority for key enterprise applications. With dual active controllers, the ES1686dc provides instant hardware backup with virtually no downtime and is the cornerstone of critical enterprise storage.

  1. 16 x 3.5 inch/2.5 inch SAS 12Gb/s HDD/SSD
    Create a large data storage space with SAS 12Gb/s and SAS 6Gb/s hard drives or SSDs, while enjoying the advantages of high-capacity HDDs and high-speed SSDs.
  2. Intel® Xeon® D-2100 Series Processor
    Provides Intel® Xeon® D-2145NT or Intel® Xeon® D-2123IT processor selection; supports DDR4 memory and PCIe Gen3 bus processing.
  3. DDR4 2133 MHz ECC Error Correction Memory
    The four-channel DDR4 ECC system main memory, the single-sided controller provides a total of eight RDIMM slots, up to 512 GB.
  4. 2 PCIe Gen3 x8 slots
    It can be installed with 10GbE / 40GbE NIC, QM2 expansion card or SAS expansion card to provide application expansion flexibility.
  5. 4 10GbE SFP+ networks ports
    Support 10GbE high-speed network environment, fully meet the needs of enterprises for high-speed operations such as virtualized applications, large file access, backup and recovery.
  6. Backup battery unit (BBU)
    In the event of a power outage, the BBU can immediately provide a power protection write cache and simultaneously overwrite the data to the backup controller to ensure correct and consistent data.
  7. 3 Gigabit networks Ports
    Can do Service Binding, Port Trunking and MPIO configuration. One of them is dedicated to remote management.
  8. 2 USB 3.0 ports
    Flexible USB external devices can be flexibly connected as required.
  9. 2 M.2 SSD files
    Supports PCIe (Gen3 x4) NVMe SSD and SATA 6Gb/s high-speed SSD for system read/write cache. (System shipment does not include M.2 SSD)


For 6Gbps SAS to SATA hard disk / SSD adapter

SATA 6Gb/s interface SSDs provide a high-speed and economical storage solution, but are limited by the fact that SATA SSDs do not support dual-homing and therefore cannot be used in dual-controller environments. Designed for the QNAP Enterprise ZFS NAS, the QDA-SA hard drive adapter converts SAS signals into hard drive bays for SATA 6Gb/s connectors. With the QDA-SA's SATA HDD/SSD for dual-controller ES1686dc, SATA SSDs also feature SAS Dual-port fault tolerance, providing powerful support for high availability applications and helping organizations enjoy economical and flexible Save the configuration plan.

New QES 2.1.0 operating system: running ZFS file system, Flash random write performance is more excellent

The ES1686dc is equipped with a new generation QES (QNAP Enterprise Storage) 2.1.0 operating system based on the FreeBSD core and featuring a ZFS file system that is optimal for high-end enterprise applications, demonstrating high performance and robust data protection and disaster recovery mechanisms. And a variety of enterprise management features. QES 2.1.0 is based on the flash-optimized architecture, especially for all-flash (All Flash)-configured storage arrays, helping organizations accelerate the speed of business-critical applications and effectively overcome remote virtual desktops ( VDI) Challenges in the application environment. QES 2.1.0 also supports QoS management capabilities to provide performance guarantees in a multi-user environment. The QES operating system continues the QTS user experience, helping enterprise users enjoy the lowest learning curve and fastest deployment speed, and seamlessly connect to the current QNAP NAS.

Unleash the potential of SSD - fine, flexible, and breakthrough

QES 2.1.0 uses QNAP's exclusive Write Coalescing algorithm to optimize the read and write performance of the Full Flash storage environment in the ZFS file system, providing more enterprise-level data management and mission-critical operations. A cost-effective full flash storage solution.
Note: The Write coalescing algorithm for QES 2.1.0 is not currently supported on dual-controller NAS systems and will be released in the next release of QES.

Write aggregation algorithm

The scattered and randomly written data can be sequentially sorted and merged into the block, thereby reducing the number of I/Os, which not only significantly improves the write performance of the full flash configuration, but also helps the durability and service life of the SSD.

Software-defined reserved space (Software-defined Over-provisioning)

Users can flexibly set 1% ~ 60% of SSD reserved space and 1% ~ 40% of storage pool reserved space according to demand, so that continuous write performance can grow by more than 100%.

Data deduplication, compression and compaction to create an enterprise application environment with more than 500 VDIs

Remote virtual desktop (VDI) applications that store large amounts of the same operating system and applications simultaneously have incredible data repeatability (up to 90% or more). The ES1686dc is equipped with a QES operating system to create the most cost-effective remote virtual desktop platform and mission-critical data warehousing for the enterprise.

Inline Data Deduplication
The block-based data deduplication mechanism saves a significant amount of data storage space and helps keep the available disk capacity up to date.
Instant data compression (Inline Compression)
Helps reduce the actual I/O load on the backend storage and gain access acceleration. In a VDI environment, the virtual desktop operating system files can be greatly streamlined, making it easier to be cached and boosting operational performance.
Instant data compaction (Inline Compaction)
In the context of high data duplication or large amounts of small data access (eg, transaction log records for banks or business websites), the benefits of increasing SSD space usage are particularly significant, making the full flash storage architecture more cost effective.
Note: The data compaction function of QES 2.1.0 is not currently supported by the dual-control architecture NAS system and will be released in the next version of QES.

Self-healing error blocks to ensure data correctness and availability

ES1686dc supports the self-healing capability of Silent Data Corruption, which allows Checksum for all data blocks. If the static data is damaged due to hardware (for example, broken transmission line), driver, or Metadata error, the next time you read this block, the backup data will be automatically repaired due to the inconsistency of Checksum results. Correctness.

Nearly unlimited snapshots sync with SnapSync snapshots to create an impeccable disaster recovery mechanism

The ES1686dc supports snapshots of iSCSI LUNs and shared folders with up to 65,535 snapshots (assuming one snapshot per hour, 24 per day, which can be maintained for 7 years without deletion!). The established snapshots can be backed up to the remote through the block-based SnapSync snapshot synchronization function. When a disaster occurs, comprehensive and efficient snapshot synchronization allows the enterprise to quickly restart important services in a remote location in a short time

Remote backup, data restoration is not interrupted

QES's snapshot service uses Copy-on-Write technology to take snapshots almost instantaneously without affecting data writes. Accelerate offsite backup with SnapSync's differential backup. SnapSync also supports instant data deletion and compression. Before synchronization, the source ES1686dc first deletes the data and compresses the metadata, which greatly reduces the amount of data in the synchronous backup and reduces the network bandwidth requirement

Integrate VMware SRM

QES's SnapSync technology integrates with VMware Site Recovery Manager (SRM) to provide a remote backup and disaster recovery solution for high-end enterprise-class virtualized environments. With the Storage Replication Adapter (SRA) plug-in, VMware Site Recovery Manager offloads the operations required to back up virtual machines to storage-side implementations, dramatically reducing the load on ESXi virtual hosts.

Establish a consistent snapshot of VMware/Windows with QNAP Snapshot Agent

QNAP NetBak Replicator is an easy-to-use backup software that supports the VSS mechanism. Organizations do not need to purchase expensive and complex large-scale commercial software. They can also create an "application consistency" full file backup in the database and virtual machine environment. The QNAP Snap Agent and VSS Hardware Provider are very simple to operate, including VSS Service, Requestor, Provider, and QNAP Snap Agent. They can be deployed on the same server as the VSS-Aware application. Prepare at least one ES1686dc and one. The server can be operated.

Complete virtualized storage application, also supports iSER

ES1686dc supports VMware® vSphere® 6.5, Windows Server® 2016, and Citrix XenServer® 7.0 for flexible deployment and management of virtualized environments; and supports VMware® VAAI and Microsoft® ODX to offload virtual host loads to increase system operational efficiency. In addition, QNAP vSphere Client plug-in, Web plug-in and QNAP SMI-S provider are also supported, and the management efficiency of virtualized applications is effectively improved. By installing ES1686dc and VMware® ESXi servers with iSER-aware Mellanox® smart NICs, you can get iSER offload capabilities and enhance VMware® virtual application performance.

Easily build an OpenStack hybrid cloud platform

ES1686dc supports Cinder block storage and Manila shared folder services for OpenStack® cloud platform operations. Enterprise organizations can use the QNAP Cinder Driver to easily import ES1686dc into the OpenStack block storage environment, providing robust data storage and protection services for online stored data, while protecting the data on the virtual machine through snapshot management functions. ES1686dc provides a flexible, low-complexity, and low-cost storage solution for enterprise organizations deploying the OpenStack cloud architecture.

5-year standard warranty

The ES1686dc has a free product warranty for up to 5 years. QNAP provides such an honorable warranty to help your business organization continue to operate and provide uninterrupted service to your customers.


Available Model

ES1686dc-2123IT-64G: 32 GB RDIMM DDR4 ECC (4x8 GB) per controller
ES1686dc-2145NT-96G: 48GB RDIMM DDR4 ECC (4x4 GB + 4x8GB) per controller
ES1686dc-2145NT-128G: 64 GB RDIMM DDR4 ECC (4x16 GB)per controller

Hardware Spec


ES1686dc-2123IT-64G: Intel® Xeon® D-2123IT quad-core 2.20 GHz processor per controller (up to 3.0 GHz)

ES1686dc-2145NT-96G: Intel® Xeon® D-2145NT eight-core 1.90 GHz processor per controller (up to 3.0 GHz)

ES1686dc-2145NT-128G: Intel® Xeon® D-2145NT eight-core 1.90 GHz processor per controller (up to 3.0 GHz)

CPU Architecture

64-bit x86

Floating Point Unit

Encryption Engine


System Memory

ES1686dc-2123IT-64G: 32 GB RDIMM DDR4 ECC (4x8 GB) per controller

ES1686dc-2145NT-96G: 48GB RDIMM DDR4 ECC (4x4 GB + 4x8GB) per controller

ES1686dc-2145NT-128G: 64 GB RDIMM DDR4 ECC (4x16 GB)per controller

Maximum Memory

512 GB (8 x 64GB)

Memory Slot

Important: Only one dual-row memory module (DIMM) can be used at a time. Do not use both RDIMM type memory and UDIMM type memory at the same time.

Flash Memory

4 GB (dual boot OS protection)

Drive Bay

16 x 3.5-inch
SAS 12Gb/s, backward-compatible to SAS 6Gb/s

Drive Compatibility

3.5-inch bays:
3.5-inch SAS/SATA hard disk drives
2.5-inch SAS/SATA hard disk drives
2.5-inch SAS/SATA solid state drives


M.2 SSD slot

2 x M.2 port
Supports SATA 6Gb/s or NVMe Gen3 x4 2280

SSD Cache Acceleration Support

Cache for Copy To Flash (C2F)

1 per each controller (64GB)

Gigabit Ethernet Port (RJ45)

3 for each controller (one for remote management)

10 Gigabit Ethernet Port

Each controller: 4 10G SFP+

Jumbo Frame

PCIe Slot

slot 1: PCIe Gen3 x8 (CPU)
slot 2: PCIe Gen3 x8 (CPU)

USB 3.0 port

2 per each controller

Form Factor

3U Rack Mount

LED Indicators

System Power LED (Green): On/Off
System Status (Green/Orange): In Operation, System Error, Low Power, Degraded RAID Mode, Memory Failure, Fan/Power Supply Failure, System/Hard Disk Overheat, Storage Pool The critical value is reached, the system performs reception, and the power supply is removed.
LCD status display (two digits): JBOD connection status


Power, Reset

Dimensions (HxWxD)

132 × 483.05 × 630.62 mm

Weight (Net)

25.83 kg

Weight (Gross)

32.69 kg

Operating temperature

0 - 40 °C (32°F - 104°F)

Relative Humidity

5~95% RH non-condensing, wet bulb: 27˚C (80.6˚F)

Power Supply Unit

Backup/ Hot Swap Power Vin:90~264VAC;770W

Power Consumption: Operating Mode, Typical

500.87 W


Hot-swappable fan module (60*60*38mm; 16000RPM/12v/2.8A x 3)

Sound Level

66.1 db(A)

Safety Standard

FCC Class A (USA only)
CE Mark ( EN55022 Class A, EN55024)

Note: Use only QNAP memory modules to maintain system performance and stability. For NAS devices with more than one memory slot, use QNAP modules with identical specifications. Warning: Using unsupported modules may degrade performance, cause errors, or prevent the operating system from starting.
* Sound Level Test Environment: Refer to ISO 7779; Maximum HDD loaded; Bystander Position; Average data from 1 meter in front of operating NAS.
Designs and specifications are subject to change without notice


Last Updated: Sunday, 16 May 2021 16:07

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