QNAP ES1686dc R2 16-Bay Dual-Controller SAS Rackmount NAS
A resilient storage core for essential business services When applications depend on shared storage, the controller path matters as much as the drives. QNAP ES1686dc R2 combines two active controllers, Intel Xeon processors and QES ZFS storage in a serviceable rack appliance. It is designed for managed file and block storage, with protected write caching and replication tools that can form part of a carefully engineered availability plan. Match the host paths, SAS drives and recovery design before placing production services on the system. Highlights Availability by design Two active controllers with failover and failback support. Protected write caching and hot-swappable service components. Enterprise storage platform Intel Xeon processing and ECC memory per controller. SAS drive paths with QES ZFS data services. Connected infrastructure 10GbE SFP+ connectivity and optional compatible network/SAN cards. Dual-controller expansion designed around redundant paths. Key Features Two controllers with an engineered host path Both controllers can serve storage workloads, with failover and failback intended to maintain access through selected controller events. The host, switches, network paths and multipath configuration must support the same availability objective. A dual-controller appliance does not turn a single network cable or untested application into an uninterrupted service; validate failover behaviour as part of deployment. Protect the write path as well as stored data Each controller uses battery-backed write protection and copy-to-flash hardware to protect cached data through supported power-loss events. ZFS adds checksums and supported self-healing to the storage design. Monitor the backup batteries and other service components, maintain suitable external power protection and test recovery procedures. These mechanisms reduce particular risks without guaranteeing that every possible failure will preserve application continuity. Choose SAS storage for both controllers The shared bays use SAS drive paths for supported SAS hard drives or SSDs. Select drives with the appropriate dual-port behaviour, sector format, firmware and endurance for the intended pool. Ordinary single-port SATA drives are not a direct equivalent and are not offered here as an unqualified replacement. Expansion likewise needs a supported dual-controller enclosure and redundant SAS cabling. QES data services for shared infrastructure QES is a FreeBSD-based ZFS storage operating system with file sharing, block storage, snapshots, compression, deduplication and supported replication functions. It is distinct from QTS and QuTS hero. This appliance is designed to present storage to application and virtualisation hosts; it should not be selected on the assumption that ordinary QTS applications, containers or camera-recording software can be installed on it. Replicate with a defined recovery objective SnapSync and supported backup integration provide routes to another storage system, subject to a compatible target and network design. Select synchronous or scheduled replication around latency, application consistency and the recovery objective. Keep protected backup copies as well: a replicated deletion or compromised administrator account may affect more than the primary appliance. Service the installation with fewer surprises The factory package includes RAIL-E02, so a second rail kit is not normally required for the appliance. Verify rack mounting depth, cooling, power circuits and service access before installation. Hot-swappable controllers, power and fan modules support maintenance planning, while documented monitoring and component-replacement procedures remain essential to operating the system responsibly. Summary ES1686dc R2 is suited to organisations building a managed, resilient storage service around compatible SAS drives and properly configured host paths. Its dual-controller architecture and QES data services provide the building blocks; the result depends on the complete network, host, monitoring and recovery design. Plan and test that design before relying on it for essential workloads. Is the memory shown a total for both controllers?ExpandCollapse Yes. The Configuration selector shows total system memory. The corresponding per-controller memory is half that total, and each controller has its own processor and memory. Use matching supported memory configurations and do not mix registered and load-reduced DIMM types. Can I use ordinary SATA hard drives?ExpandCollapse The supported shared-drive path is SAS. Do not assume an ordinary SATA drive can provide the required access from both controllers. Use an exact qualified SAS drive, sector format and firmware; any adapter-based proposal needs separate verification. Does it run QTS apps or record IP cameras?ExpandCollapse No QTS, QuTS hero or QVR entitlement is promised. ES1686dc R2 runs QES for enterprise file and block storage. Use a supported application or recording host with the NAS providing appropriate storage where the design has been validated. Which expansion unit can I use?ExpandCollapse The verified route is up to seven TL-R1620Sdc dual-controller SAS enclosures, with the correct SAS adapters and redundant cabling. USB and ordinary single-controller expansion enclosures are not substitutes. Do I need to buy a rail kit?ExpandCollapse RAIL-E02 is included in the factory package. Confirm rack depth and mounting suitability before installation; a second appliance rail kit is not normally needed. Does dual-controller mean no downtime?ExpandCollapse It supports failover and failback for an engineered high-availability design. Results depend on host multipath, network paths, software configuration and the fault involved. Test the intended failure scenarios and maintain independent backups.
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QNAP ES1686dc R2 16-Bay Dual-Controller SAS Rackmount NAS
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Paglalarawan
A resilient storage core for essential business services
When applications depend on shared storage, the controller path matters as much as the drives. QNAP ES1686dc R2 combines two active controllers, Intel Xeon processors and QES ZFS storage in a serviceable rack appliance. It is designed for managed file and block storage, with protected write caching and replication tools that can form part of a carefully engineered availability plan. Match the host paths, SAS drives and recovery design before placing production services on the system.
Highlights
Availability by design
- Two active controllers with failover and failback support.
- Protected write caching and hot-swappable service components.
Enterprise storage platform
- Intel Xeon processing and ECC memory per controller.
- SAS drive paths with QES ZFS data services.
Connected infrastructure
- 10GbE SFP+ connectivity and optional compatible network/SAN cards.
- Dual-controller expansion designed around redundant paths.
Key Features
Two controllers with an engineered host path
Both controllers can serve storage workloads, with failover and failback intended to maintain access through selected controller events. The host, switches, network paths and multipath configuration must support the same availability objective. A dual-controller appliance does not turn a single network cable or untested application into an uninterrupted service; validate failover behaviour as part of deployment.
Protect the write path as well as stored data
Each controller uses battery-backed write protection and copy-to-flash hardware to protect cached data through supported power-loss events. ZFS adds checksums and supported self-healing to the storage design. Monitor the backup batteries and other service components, maintain suitable external power protection and test recovery procedures. These mechanisms reduce particular risks without guaranteeing that every possible failure will preserve application continuity.
Choose SAS storage for both controllers
The shared bays use SAS drive paths for supported SAS hard drives or SSDs. Select drives with the appropriate dual-port behaviour, sector format, firmware and endurance for the intended pool. Ordinary single-port SATA drives are not a direct equivalent and are not offered here as an unqualified replacement. Expansion likewise needs a supported dual-controller enclosure and redundant SAS cabling.
QES data services for shared infrastructure
QES is a FreeBSD-based ZFS storage operating system with file sharing, block storage, snapshots, compression, deduplication and supported replication functions. It is distinct from QTS and QuTS hero. This appliance is designed to present storage to application and virtualisation hosts; it should not be selected on the assumption that ordinary QTS applications, containers or camera-recording software can be installed on it.
Replicate with a defined recovery objective
SnapSync and supported backup integration provide routes to another storage system, subject to a compatible target and network design. Select synchronous or scheduled replication around latency, application consistency and the recovery objective. Keep protected backup copies as well: a replicated deletion or compromised administrator account may affect more than the primary appliance.
Service the installation with fewer surprises
The factory package includes RAIL-E02, so a second rail kit is not normally required for the appliance. Verify rack mounting depth, cooling, power circuits and service access before installation. Hot-swappable controllers, power and fan modules support maintenance planning, while documented monitoring and component-replacement procedures remain essential to operating the system responsibly.
Summary
ES1686dc R2 is suited to organisations building a managed, resilient storage service around compatible SAS drives and properly configured host paths. Its dual-controller architecture and QES data services provide the building blocks; the result depends on the complete network, host, monitoring and recovery design. Plan and test that design before relying on it for essential workloads.
Is the memory shown a total for both controllers?
Yes. The Configuration selector shows total system memory. The corresponding per-controller memory is half that total, and each controller has its own processor and memory. Use matching supported memory configurations and do not mix registered and load-reduced DIMM types.
Can I use ordinary SATA hard drives?
The supported shared-drive path is SAS. Do not assume an ordinary SATA drive can provide the required access from both controllers. Use an exact qualified SAS drive, sector format and firmware; any adapter-based proposal needs separate verification.
Does it run QTS apps or record IP cameras?
No QTS, QuTS hero or QVR entitlement is promised. ES1686dc R2 runs QES for enterprise file and block storage. Use a supported application or recording host with the NAS providing appropriate storage where the design has been validated.
Which expansion unit can I use?
The verified route is up to seven TL-R1620Sdc dual-controller SAS enclosures, with the correct SAS adapters and redundant cabling. USB and ordinary single-controller expansion enclosures are not substitutes.
Do I need to buy a rail kit?
RAIL-E02 is included in the factory package. Confirm rack depth and mounting suitability before installation; a second appliance rail kit is not normally needed.
Does dual-controller mean no downtime?
It supports failover and failback for an engineered high-availability design. Results depend on host multipath, network paths, software configuration and the fault involved. Test the intended failure scenarios and maintain independent backups.
Mga detalye
QNAP ES1686dc R2 16-Bay Dual-Controller SAS Rackmount NAS
The QNAP ES1686dc R2 is a dual-controller enterprise SAS NAS running the QES operating system. Its active-active controller architecture, ECC memory, protected write cache and redundant power support a resilient storage design for file services and virtualised infrastructure. Each controller has its own processor, memory and network connections. Storage drives, host multipath settings and supported expansion must be planned together, while the included rail kit supports installation in a suitable server rack.
| Specification | Details |
|---|---|
| Controller and hardware | |
| Controller architecture | 2 active-active controller modules; each has its own processor, memory and network interfaces. |
| Processor configurations | Xeon D-2123IT per controller, 4 cores/8 threads, 2.2GHz up to 3.0GHz; or Xeon D-2142IT per controller, 8 cores/16 threads, 1.9GHz up to 3.0GHz. |
| Factory memory | 64GB total is 32GB per controller; 96GB total is 48GB per controller; 128GB total is 64GB per controller. DDR4 ECC registered memory. |
| Memory expansion | 8 DDR4 RDIMM/LRDIMM slots per controller; maximum 512GB per controller or 1TB total using 64GB modules. Do not mix RDIMM and LRDIMM types. |
| System flash and cache | 4GB dual-boot flash; RAM ARC read cache, supported SSD L2ARC, protected NVRAM/ZIL write cache; one 64GB M.2 copy-to-flash device per controller. |
| Drive bays | 16 hot-swappable SAS 12Gb/s bays, backward-compatible with SAS 6Gb/s; supported 3.5-inch SAS HDDs, 2.5-inch SAS HDDs and 2.5-inch SAS SSDs. SATA is not a direct drop-in substitute. |
| Network interfaces | Per controller, 4 × 10GbE SFP+ and 3 × RJ45 ports, with one RJ45 reserved for remote management. Current manufacturer specifications describe 2.5GbE RJ45; supplied revision must be confirmed where link speed is material. |
| PCIe slots | 2 × PCIe Gen3 x8 per controller; verify compatible card, bracket, clearance and redundant design. |
| USB ports | 2 per controller for engineering use only; external USB storage and USB UPS devices are not supported. |
| QES storage services | |
| Operating system | QES, based on FreeBSD with ZFS; not QTS or QuTS hero. |
| RAID and data integrity | RAID 0/1/5/6/10/50/60, triple parity and triple mirror where drive requirements are met; checksums, supported self-healing, pool scrubbing, hot spare and data reduction. |
| Snapshots and replication | Shared-folder and LUN snapshots; supported real-time or scheduled SnapSync replication and Rsync server functions. Compatible target and recovery configuration required. |
| File and block access | SMB, NFS, FTP/FTPS and block-based iSCSI; supported iSER with appropriate RDMA hardware and host configuration. Optional Fibre Channel target support requires compatible cards. |
| Permissions and directory integration | Local access controls, Windows ACL, Microsoft Active Directory and LDAP integration. |
| High availability | HA Manager, failover/failback and supported rolling updates. Host multipath, redundant network design and tested application recovery are required for the intended availability. |
| Concurrent connections | Up to 10, 000 CIFS connections with maximum memory; actual workload limits apply. |
| Surveillance applications | No QVR entitlement or camera-recording capacity is specified for QES. Use a separately supported surveillance recorder if recording is required. |
| Storage expansion | |
| Compatible enclosures | Up to 7 × TL-R1620Sdc dual-controller SAS expansion enclosures. |
| Required expansion hardware | Compatible QXP-820S-B3408 SAS adapters and supported external SAS cabling in a redundant dual-path arrangement; confirm the complete controller/enclosure topology. |
| Expansion restriction | Do not substitute a single-controller TL-R1220Sep/TL-R1620Sep, SATA JBOD or USB enclosure for the verified dual-controller expansion design. |
| Physical and electrical | |
| Form factor | 3U rackmount. |
| Dimensions H × W × D | 132 × 446.2 × 587.75mm chassis dimensions; allow rack ears, cabling and service clearance. |
| Weight | Manufacturer net figures 24.55–30.22kg depending on configuration; gross 34.92kg. Confirm handling requirements for the supplied configuration. |
| Power | Redundant hot-swappable 700W power supplies; AC 90–264V. |
| Typical consumption | 500.87W under the manufacturer fully populated test configuration; actual use varies. |
| Cooling | Hot-swappable module with 3 × 60mm fans. |
| Environment | Operating 0–40°C; storage −20–70°C; 5–95% non-condensing relative humidity, wet-bulb 27°C. |
| Warranty | 5 years. |
| Package | NAS, RAIL-E02, 2 power cords, 2 Ethernet cables, console cable, drive screws, 2 write-cache battery backup units and quick installation guide. Storage drives are not included. |
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