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QNAP ES1640dc
16-Bay Active-Active Dual Controller ZFS NAS and iSCSI/ IP-SAN. 3U, SAS/SATA 6G, 2 x10GbE(10GBase-T), 40GbE-ready.

QNAP ES1640dc

This Product is no longer available. Please see ES1640dc v2 as a replacement.


The ES1640dc is whole-new product line developed by QNAP for mission-critical tasks and intensive virtualization applications. With Intel® Xeon® E5 processors, dual active controllers, ZFS, HPE Helion compatibility and fully supporting virtualization environments, the ES1640dc delivers "real business-class" cloud computing data storage. The ES1640dc features the brand-new QES operating system that allows almost limitless snapshots, block-level data deduplication, and thin provisioning with reclaim, assisting businesses in building the most cost-efficient VDI platform and storage for critical data. The ES1640dc provides the same user experience as the current QNAP NAS and QTS system, allowing business users to enjoy the easy learning curve and quickly deploy the system, and making it ideal for small and medium businesses with budget constraints or large-scale IT divisions coping with mission-critical tasks.

  • Dual active controllers, NVRAM cache, dual mini-SAS channel backup, 40GbE-ready, SAS 6Gb/s-enabled
  • QES operating system which is based on FreeBSD and ZFS
  • Data deduplication and compression allows hosting over 200 VDI in one chassis
  • Near-limitless snapshots and SnapSync for efficient disaster recovery
  • NAS and iSCSI/IP-SAN storage supporting VMware®, Microsoft® Hyper-V, KVM and advanced virtualization features
  • Fully supports OpenStack® iSCSI Cinder driver, and compatible with HPE Helion
  • Scalable design, up to 1 PB total storage capacity
  • 5 year warranty - Global warranty inclusive

Intel® Xeon® E5 dual-controller for nearly zero downtime high-availability

The ES1640dc is powered by two Intel® Xeon® E5-2400 v2 processors and features dual active-active controller architecture, ensuring businesses with nearly zero downtime high availability as the standby controller can quickly take over if one controller breaks down. The ES1640dc connects to the JBOD enclosure (EJ1600) via the dual path mini-SAS design to sustain continuous operations even if an external JBOD cable is disconnected. Designed around redundancy, the ES1640dc is the best realization of reliable enterprise storage for uninterrupted mission-critical enterprise tasks and productivity.

Active-Active HA Dual Controller


Dual controller NAS: high reliability and high availability

"Reliability" is the primary priority for mission critical business applications. The ES1640dc adopts dual active-active controllers to provide the most reliable base for business IT storage.

Dual Controller NAS

1. Dual active-active controller

If one controller fails, the other one will immediately take over to provide high availability with the least downtime.

2. Built-in 2 x 10GbE RJ45 ports

Meets various iSCSI/NFS/CIFS network data transmission requirements.

3. 40GbE NIC support

The PCIe slot supports a dual-port QSFP+ 40GbE NIC to provide massive data transmission potential and to simplify network cabling.

4. SAS 6Gb/s hard drive and SATA SSD

Dual-controller architecture that supports SAS 6Gb/s hard drives / SSDs and SATA SSDs, providing versatile storage choices for enterprises.

5-1. NVRAM w/ Copy-to-Flash

Battery-protected DRAM write to cache data protection and Flash read acceleration provides industry-leading random access performance to benefit virtual machine deployment.

5-2. DDR3 RAM

(1) NVRAM dedicated DDR3 memory modules - supports 16GB, power required by C2F is supplied by BBU.
(2) Dual-channel DDR3 system main memory - each channel supports 16GB, providing up to 32GB total capacity.

5-3. mSATA SSD

Stores cache data written by DRAM to ensure information is not lost if the system experiences a sudden power failure.

6. Dual Path Mini-SAS 6Gb/s (EJ1600) JBOD architecture

Increases the ES1640dc's potential storage capacity to over 1 PB with expansion enclosures.

7. Intel® Xeon® E5-2400 v2 series processor

Provides the performance required by software-defined storage and commercial mission-critical applications.

8. Field-replaceable unit

Field-replaceable unit (FRU) applies not only to the controllers but also to the cooling fans, power supplies, and the BBU battery pack for C2F (Copy-To-Flash), providing a cost-effective way to maintain complex systems and to replace defective parts.

Field-replaceable unit
Field-replaceable unit (copy-to-flash)

NVRAM cache reducing the risks of losing write cache data

To increase random write performance and reliability, the ES1640dc features NVRAM modules (DRAM Write Cache with Copy-to-flash) to protect write data. When data is written into NVRAM, there are dedicated backup battery units to protect writing to the cache, and at the same time the data is replicated to a backup controller, to achieve 100% data integrity. NVRAM-backed write cache in the dual-controller architecture presents high performance, fault-tolerant, and helps reduce flash SSD write amplification.

*To ensure write cache data safety, it is recommended to annually replace the BBU.


QES operating system combining ZFS file system

The ES1640dc features the brand-new QES (QNAP Enterprise Storage) operating system, which is based on the simple and efficient FreeBSD kernel and the ZFS file system that has been proven through years of experience to be most suitable for high-end enterprise applications. QES supports dual active controller architecture and remote disaster recovery, can be directly integrated into OpenStack® cloud environments, and is designed for intensive virtualization and VDI applications with optimal performance. Continuing the same user experience with the QTS operating system, QES provides business users with an easy learning curve to quickly deploy the ES1640dc, and provides the best storage solution jointly with the current QNAP NAS.


Overview of QNAP Enterprise ZFS NAS and the QES operating systems

QNAP Enterprise System
QNAP Turbo NAS System
Hardware platform Enterprise ZFS NAS
ES series NAS
TS / TVS / TAS / TDS series
Operating system kernel FreeBSD Linux
File system ZFS Ext4
myQNAPcloud Yes Yes
App support Qmanager, Qfile All available apps
File Station Yes Yes
App Station No Yes
Virtualization Station No Yes
Container Station No Yes
Dual active controller Yes No
NVRAM (Write to cache) Yes No
40G Ethernet network Yes Yes
Intel Quick Assist No Yes
Snapshot upper limit 65536 1024
Single LUN snapshot upper limit 65536 1024
Deduplication Yes No
Real time data compression Yes No
End-to-End Data Integrity Yes No
Application consistency Snapshot Agent
VSS Hardware Provider
(QNAP NetBak Replicator)
Snapshot Agent
VSS Hardware Provider
(QNAP NetBak Replicator)
Remote disaster backup and recovery SnapSync Snapshot Replica

ZFS - the best file system for business data storage

The ES1640dc features ZFS, a combined file system and logical volume manager, to support various advanced functions for high-end enterprise storage, including powerful storage expansion, flexible storage pools, simplified management, high-performance SSD cache, nearly limitless snapshots and cloning, data deduplication, in-line compression and thin provisioning with reclaim for optimized utilization for virtual machine storage. ZFS is designed with a focus on data integrity, and uses its end-to-end checksums to detect and correct silent data corruption caused by hardware defects, bugs in firmware or metadata errors, effectively protecting user's data.


Deduplication and compression to maximize VDI storage performance

There could be over 90% duplicate data from OS images and applications that are spread over virtual desktops. The ES1640dc supports block-based data deduplication to optimize storage usage from redundant data. Deduplicated virtual desktops become easier to be cached to achieve optimal virtual desktop performance. In-line data compression helps shrink data size, further optimizing storage usage. For mastering storage in a virtualized environment, the ES1640dc provides businesses with the most cost-effective remote virtual desktop platform and mission-critical information warehousing.

Data Duplication

Strong disaster recovery made by nearly limitless snapshots and SnapSync

The ES1640dc supports up to 65,536 snapshots for iSCSI LUN and shared folders. When executing a remote snapshot backup, it only needs to transfer changed data, and can use deduplication and compression to significantly reduce the amount of transferred data. The ES1640dc can provide remote backup SnapSync for snapshots at the shortest interval of every five minutes, fully supports VMware vCenter Site Recovery (SRM) technology, provides Storage Replication Adapter (SRA) for SRM, and provides enterprise-class remote backup & disaster recovery solution to fulfill business continuity.


Well-rounded backup solutions to secure data

QNAP Netbak Replicator is an easy-to-use and VSS-aware backup software, and helps businesses to create complete backups in datacenter and virtualization environments without needing to purchase expensive and complex commercial software. To build a QNAP Snap Agent and VSS Hardware Provider operating environment, all applications (including VSS Service, Requestor, Provider and QNAP Snap Agent) can be deployed with VSS-Aware applications on the same server, and the minimal requirements are only one ES1640dc and one server for it to be operational.

Backup Solutions


Storage for comprehensive virtualization applications

The ES1640dc is certified for VMware® vSphere 6.0, and is compatible with Microsoft® Hyper-V and KVM, benefiting flexible deployment and management in virtualization environments. The ES1640dc supports VMware VAAI and Microsoft ODX to increase performance by offloading server loading for ESXi server and Hyper-V respectively, and supports QNAP vSphere Client plug-in, Web plug-in and QNAP SMI-S provider with enhanced efficiency of operations and management in virtualization applications.

Compatible with HPE Helion for extending horizons to OpenStack cloud

As QNAP's first "OpenStack Ready" product line, the ES1640dc is not only suitable for virtualization and virtual desktop environments but also the best choice for cloud applications. QES supports OpenStack® Cinder and iSCSI Cinder Node drivers, and provides block-level storage space to virtual machines. It not only accelerates the deployment of virtual machines and enhances virtual machine image access efficiency through iSCSI, but it is also easier to integrate into commercial cloud storage platforms. QES can be easily coupled with HPE Helion* to provide simpler and more reliable private enterprise hybrid cloud solutions, to ensure that enterprises can still enjoy uninterrupted, highly available, highly-stable services in dense virtualized environments.

HPE Helion

5 year warranty - Global warranty inclusive

QNAP's ES1640dc offers 5 year warranty with 3-year global warranty inclusive at no extra cost. This premier warranty demonstrates QNAP's attention to the essential business needs of continuous operations and non-interrupted services to their customers.

QNAP's 5 year warranty

Seamless capacity expansion

The ES1640dc supports efficient capacity expansion by cascading multiple QNAP RAID expansion enclosures to meet the needs of growing business data, providing businesses a cost-efficient storage solution for large data archiving and virtualization applications.

Featuring dual controllers, dual-loop architecture, the ES1640dc and the corresponding JBOD expansion enclosures all provide dual-channel (Dual Path) to tolerate single node failure. Even if an external JBOD cable is disconnected due to external damage to the mini-SAS cable, it can still run normally. This is essential for better intermachine data protection and capacity scalability.

The maximum total storage capacity available by connecting RAID expansion enclosures:

NAS Model RAID Expansion Enclosure No. of RAID Expansion Enclosure Total HDD No. (NAS + Enclosure) Max. Raw Capacity (TB)*
ES1640dc EJ1600 7 128 1024
6 112 896
5 96 768
4 80 640
3 64 512
2 48 384
1 32 256


CPU Intel Xeon E5-2400 v2 family processor
Intel Xeon 6-core Processor E5-2420 v2 (15M Cache, 2.20GHz)
Memory System memory: DDR3 RDIMM
Total memory slots: 6 (Dual controllers; 2 x main memory DIMM and 1 x write cache DIMM for NVRAM for each controller.)
32GB for main memory DIMM and 16GB write cache DIMM per controller.
USB 2 x USB 3.0/2.0 port
Hard Drive 16 x 3.5"/2.5" SAS 6Gbps hard drive, or 2.5" SAS/SATA SSD (LSISS9252 SAS-to-SATA Interposer is required.)
Maximized Raw Capacity 128TB (Configuration: 16 x 8TB hard drives)
Hard Drive Interface SAS 6Gb/s
10/100/1000 Mbps LAN Port 1 for each controller (for remote management)
10Gbps LAN Port 2 x RJ45, Intel X540-BT2 for each controller
PCIe Slot PCIe Slot x8 (Gen3 x8): reserved for 40GbE or 10GbE LAN card
PCIe Slot x4 (Gen2 x4): reserved for dual path Mini-SAS
Cache mSATA SSD dedicated to NVRAM, SATA signaling
Form Factor 3U rackmount
Dimension 618(D) x 446.2(W) x 132(H) mm (excluding front grips)
Weight Net weight (NAS only): 26.75 kg / 58.97 lb
Gross weight (with packing and accessories): 36.94 kg / 81.44 lb
Sound Level Sound pressure (LpAm) (bystander position): 66.1dB
Power Consumption Sleep mode: 314.86 W
In operation: 501.40 W
Power Supply 770 W (Redundancy for fault tolerance)
Fan Hot-swappable fan module (60*60*38mm; 16000RPM/12v/2.8A x 3)

ES1640dc Front Specifications


1. Hard Drive Tray 3. Power On Button
2. Hard Drive LED Indicators 4. LED Indicators
System Power LED (Green): on/off
System Status (Green/ Orange): in operation, system errors, low power, degraded RAID mode, memory failure, fan/power supply failure, system/disk temperature too high, storage pool reaching threshold value, system performing take-over, power supply unit unplugged
LCD Status Display (Two-digit number): Status of JBOD connection

ES1640dc Rear Specifications


1. Password & Network Settings Reset Button 9. PCIe Gen2 x4 Slot, with dual path Mini-SAS (SFF-8088) expansion card on board
2. Power Supply LED (Green/ Orange) 10. PCIe Gen3 x8 Slot, reserved for 40GbE LAN card
3. RJ11 to RS-232 serial 11. BBU
4. 1GbE Management Port 12. BBU Status Light (Green/ Red/ Orange)
5. 2 x USB 3.0/2.0 Port 13. Controller Status Light (Green/ Orange)
6. 2 x 10GbE (RJ45) Port 14. Fan Status Light (Green/ Orange)
7. Power Button 15. Battery Status Light (Green/ Orange)
8. Reserved Mini-SAS Port (SFF-8088) 16. High Availability LED (Green/ Orange)


The Enterprise ZFS NAS rack mount models comply with ANSI/EIA-RS-310-D rack mounting standards. Before purchasing the server racks for these models, please make sure the server racks conform to the following criteria:

  1. Rack size
    1. Mounting post width: ≥ 451mm
    2. Panel width: ≥ 485mm
    3. Mounting post depth: 609.6mm~914.4mm
    4. The distance between two rack posts is 465mm (center-to-center measurement of the rack's square holes)

    Enterprise ZFS NAS rack mount

  2. The optional rack kits for the Enterprise ZFS NAS rack mount models are compatible with both square-hole and round-hole server racks.

    optional rack kits

Designs and specifications are subject to change without notice.

Software Specifications:

Operating System High Availability
QES 1.1 (based on FreeBSD)
  • Active-Active/Active-Standby dual controller for NAS
  • Active-Active dual controller for JBOD expander
  • Automatically hardware error detection and failover
  • Automatically failback when hardware recovered
  • Data port network failover
  • Management port network failover
  • Near zero downtime high availability
  • Dual SAS link loop
  • MPIO and ALUA for iSCSI high availability
  • Link aggregation for network high availability
  • Support SMB3 Continuous Availability (CA)
Supported Client OS Power Management
  • Windows 7 (32/64-bit), Windows 8 (32/64-bit), Windows 10 (32/64-bit), Windows Server 2008 R2/2012/2012R2
  • Apple Mac OS X
  • Linux & UNIX
  • Wake on LAN
  • Internal hard drive standby mode
  • Automatic power on after power recovery
  • Network UPS support with SNMP management
Supported Browsers Access Right Management
  • Microsoft Internet Explorer 10+
  • Mozilla Firefox 8+
  • Apple Safari 4+
  • Google Chrome
  • Batch users creation
  • Import/Export users
  • User quota management
  • Local user access control for CIFS/SMB and FTP
  • Subfolder permissions support for CIFS/SMB, FTP, and File Station
Multilingual Support Domain Authentication Integration
  • Chinese (Traditional & Simplified), Czech, Danish, Dutch, English, Finnish, French, German, Greek, Hungarian, Italian, Japanese, Korean, Norwegian, Polish, Portuguese (Brazil), Romanian, Russian, Spanish, Swedish, Thai, Turkish
  • Microsoft Active Directory support
  • LDAP client
  • Domain users login via CIFS/SMB, FTP, and File Station
File System Administration
  • ZFS
  • Multi-window, multi-tasking based system management
  • Movable Icons and personalized desktop
  • Smart toolbar and dashboard for neat system status display
  • Smart fan Control
  • SNMP (v2 & v3)
  • Resource monitor
  • Network recycle bin for file deletion via CIFS/SMB and File Station
    • Automatic Cleanup
    • File Type Filter
  • Comprehensive logs (events & connection)
  • Syslog client
  • System settings backup and restore
  • Restore to factory default
  • Command Line Interface (CLI)
Networking File Server
  • TCP/IP (IPv4 & IPv6)
  • 10 Gigabit NICs with jumbo frame (LACP, Load Balance, Failover, Round Robin)
  • Service binding based on network interfaces
  • Proxy client
  • DHCP client
  • Bonjour Discovery
  • Shared folder for CIFS/SMB, NFS and FTP
  • File sharing across Windows, Mac, and Linux/UNIX
  • Windows ACL
  • Advanced folder permissions for CIFS/SMB, FTP
Security FTP Server
  • Network access protection with auto-blocking: SSH, HTTP(S), FTP, CIFS/SMB
  • CIFS/SMB host access control for shared folders
  • FIPS 140-2 validated AES 256-bit volume-based and shared folder data encryption
  • Importable SSL certificates
  • Instant alert via E-mail, SMS, beep
  • FTP over SSL/TLS (Explicit)
  • FXP support
  • Passive ftp port range control
Storage Management Backup Station
  • Storage space utilization monitoring
  • Storage pool with RAID 0, 1, 5, 6, 10, 50, 60, RAID TP, triple Mirror
  • Global hot spare
  • SSD read cache
  • NVRAM write cache (BBU-protected)
  • Scheduled Backup Battery Unit (BBU) learning
  • Supports share folder/LUN with thin provisioning
  • Supports LUN with instant provisioning
  • Supports share folder quota
  • Supports space reclaim
  • Supports snapshots
    • Supports Shared Folder/LUN snapshot
    • Snapshot manager
    • Snapshot clone
    • Snapshot agent for Windows VSS and VMware
  • Support inline deduplication for Shared Folder/LUN
  • Support inline compression for Shared Folder/LUN
  • Support inline encryption for Shared Folder/LUN
  • Support WORM (Write Once Read Many) for Shared Folder
  • Online LUN expansion
  • Online Share Folder quota expansion
  • Online storage pool expansion
  • Hard drive S.M.A.R.T.
  • SMART predict data migration
  • Time-Limited Error Recovery (TLER)
  • Storage expansion via QNAP EJ-1600 series expansion units*
  • JBOD ID Reinitialized
  • JBOD enclosure roaming
  • RAID recovery
  • Checksum for end-to-end data integrity
  • Silence error detection and self-healing
  • Pool scrub for data verification
  • Remote replication server over Rsync
  • Remote replication server over Snapsync
  • Scheduled backup
  • Snapshot support for Rsync
  • Compression, Dedup, and transfer rate limitation over Snapsync
  • Desktop backup with QNAP NetBak Replicator for Windows
  • Third party backup software support: Veeam backup & replication, Acronis True Image, Arcserve backup, emc retrospect, Symantec Backup Exec, etc.
Designs and specifications are subject to change without notice.

Optional Accessories:

Storage expansion accessories


16-bay SAS 6Gbps RAID expansion enclosure


Mini SAS external cable (SFF-8088 to SFF-8088), 3M


Mini SAS external cable (SFF-8088 to SFF-8088), 2M


Mini SAS external cable (SFF-8088 to SFF-8088), 1M


Mini SAS external cable (SFF-8088 to SFF-8088), 0.5M


Dual-port 10GBase-T RJ45 network expansion card




Battery Backup Unit for NVRAM write cache


SATA-to-SAS interposer board (Please purchase from Avago)


Various handy utilities are available for you to work smartly with your Enterprise ZFS NAS. These utilities help increase your productivity and make it absolutely easy with connecting the Enterprise ZFS NAS, setting up the system, data backup and synchronization, downloading files, and so on. Visit the Download center, find your Enterprise ZFS NAS model, and the list of available utilities are ready for you.

Qfinder Pro

Connect and set up NAS easily

Qfinder Pro is a utility, available for Windows, Mac, and Linux, to quickly find and access the Enterprise ZFS NAS over the LAN. Install the Finder on your computer, open it, and double click your Enterprise ZFS NAS name, and the login page is ready for you.

Qfinder Pro Set up

QNAP NetBak Replicator

Backup data on PC

The QNAP NetBak Replicator, provided with any Enterprise ZFS NAS unit free of charge, helps you easily back up files from Windows PC - entire disk drives, documents, pictures, music, videos, fonts, emails, and more - to the Enterprise ZFS NAS. The operation is very simple. You can do the backup task in just a few clicks using NetBak Replicator by the setting of real-time synchronization, scheduled backup and auto-backup from multiple PCs to the Enterprise ZFS NAS.

NetBak Replicator also supports backing up to a remote server via FTP and WebDAV through the Internet. Imagine that you can backup new photos whenever on vacation. Even you are away from home, the convenient backup supports your memories.

Backup data on PC

vSphere Client plug-in

Manage QNAP NAS within vSphere Client

The Enterprise ZFS NAS supports vSphere Client Plug-in that allows managing VMware datastores on the Enterprise ZFS NAS directly from the vSphere client console. In a large-scale server virtualization environment, management is centralized and straightforward. Administrators can easily control the status of the Enterprise ZFS NAS and datastores and create additional datastores to multiple ESXi hosts in just a few clicks.

Manage QNAP NAS within vSphere

QNAP Snapshot Agent

Storage Manager's Snapshot function

In QES, the Storage Manager's Snapshot function supports iSCSI LUNs to rapidly back up and restore data. When creating a LUN snapshot, QNAP Snapshot Agent for Windows Server or VMware vCenter allows the NAS to communicate with the remote server when taking snapshots and ensures Application-consistent LUN snapshots.

VSS Hardware Provider also allows NAS ROW (Redirect on Write) instead of Windows COW (Copy on Write) to increase backup efficiency and to offload the snapshot to the NAS for reducing the performance impact on the Windows server.

VSS Hardware Provider


Download the QNAP ES1640dc Datasheet (PDF).

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Pricing Notes:

QNAP Products ES1640dc
Mini SAS external cable (SFF-8088 to SFF-8088), 1.0 m
Our Price: Request a Quote
Mini SAS external cable (SFF-8088 to SFF-8088), 0.5 m
Our Price: Request a Quote