High Density HD6500

Scalable high-density storage server for multi-petabyte applications



2 x 10-core Intel Xeon Silver



Over 6,688/6,662MB/s sequential read/write1



64 GB DDR4 ECC, expandable to 512 GB



Expand to 300 drives with four RX6022sas expansion units

Consistent performance at five times the size

The HD6500 is designed to scale up to 5 times in capacity with four additional RX6022sas expansion units. SAS multipath-enabled connectivity provides up to double the typical performance together and increased redundancy.

Built for high reliability

The HD6500 is built to keep mission-critical data and services accessible, so that businesses can continue to perform even when disaster strikes.

Out-of-band (OOB) management
Dual power supply

Powerful networking options

The HD6500 supports a large variety of networking interfaces, protocols, and configurations, whether you need fast sequential transfer, support for simultaneous connections, or high network redundancy.

Built-in fast connectivity

Three Gigabit Ethernet and two 10GbE RJ-45 ports allow for rapid transfer speeds right out of the box.

Mix and match network ports

Add extra 10GbE SFP+/RJ-45, 25GbE SFP28, or Fibre Channel ports in varying configurations by leveraging the four expansion slots.2

Failover and network balancing

Bond multiple network interfaces with Link Aggregation to enable automatic network failover and load balancing.

Powerful networking options

Consolidate your data storage

Back up your backup solutions, bring all your files together in one place, or bring distributed surveillance deployments under central control.

Massive file server

Massive file server

Massive file server
Central backup server

Central backup server

Central backup server
Main surveillance storage

Main surveillance storage

Main surveillance storage

Massive file server

Host and retrieve massive files from extensive archives whenever needed. Provide user friendly access and set up powerful cross-site syncing.

A private cloud suite for file sharing

Synology Drive is a private cloud management and access solution that enables remote data access, synchronization, on-demand file restoration, and backup via desktop and mobile applications. Sync data between different platforms and devices, and access your organization’s files through mobile apps, desktop clients, and a browser-based interface. Set granular file and folder access and sharing permissions. Maintain a full overview of file activities and track file share settings changes with detailed records in the advanced Synology Drive Admin Console. Learn more

Cross-site syncing

Leverage SMB or NFS shares to provide efficient access to company files over the local network or VPN. Manage data access privileges with access control lists (ACL) though Active Directory/LDAP integration and protect files against tampering or removal with built-in snapshot technology.

Private cloud

Secure site-to site file and folder syncing

Make sure branches or teams always have up-to-date copies of crucial documents and data available locally by syncing folders one or two-way using Synology Drive ShareSync. Let your Synology systems update files across locations each time there is a change to efficiently keep all stakeholders on the same page. Learn more

Efficient cross-site syncing through the cloud

Securely synchronize files and data from the HD6500 to Synology systems across different sites or offices, and back, by leveraging hybrid cloud technology with Synology Hybrid Share.3 Synchronize large sets of data to the cloud, and leverage the powerful bandwidth of our data centers to stream requested files to local NAS deployed at branch offices, no matter their size. Frequently used files are kept stored on local NAS to provide users access at LAN speeds and can also be pinned manually to prevent them from being removed from the cache. Learn more

Cross-site syncing

Central backup server

Protect large numbers of PCs, servers, Synology systems, and hypervisors, or back up your backup servers with a central storage solution.

Backup destination for shares and LUNs

Use Hyper Backup to back up files, LUNs, installed applications, and system configurations from tens or hundreds of Synology servers to your HD6500. Set and forget backup tasks with regular schedules, enhance security with fine-grained user permissions and encryption, reduce backup sizes with built-in deduplication, and restore data flexibly with multi-versioning. Learn more

Snapshot Replication enables configurable point-in-time snapshots of shared folders and LUNs with an RPO as low as 5 minutes and recovery within seconds. Learn more

Bare-metal backup for Synology NAS

Centrally manage bare-metal backups of all your Synology servers from a single centralized console on your HD6500. Leverage built-in deduplication technology to reduce backup sizes and multi-versioning to allow flexible restoration.

Back up Synology storage systems

Bare-metal PC, server, and VM backup

Securely back up Windows clients and servers, Linux endpoints, Synology servers, and VMware® and Hyper-V® virtual machines to the HD6500 with Active Backup for Business. Coordinate all data protection from the centralized management console and choose between bare-metal or file-level restoration, while leveraging built-in deduplication technology to reduce backup sizes. Learn more

SaaS protection with local backups

Protect full Microsoft 365 and Google Workspace accounts by maintaining complete offline copies of your crucial information and configurations with Active Backup for Microsoft 365 and Active Backup for Google Workspace.

Back up Windows and Linux endpoints

Main surveillance storage

Manage distributed deployments of hundreds of local recording servers and thousands of IP cameras centrally. Learn more

Flexible scaling and expansion

Connect up to 650 IP cameras4 from a selection of over 8,300 validated models to the HD6500 itself, or connect hundreds more by adding recording servers at the edge. Easily add storage as deployments grow.

Central management and recording

Manage up hundreds of Synology NAS or NVR recording servers from one host, store copies of all or some recordings centrally, and monitor all streams from one interface with Surveillance Station Centralized Management System.

Secure and private video storage

Admins can set detailed rules for who can check live streams or review recordings and footage can be protected against unauthorized access with industry-standard AES-256 encryption.

Anywhere access with multiple clients

Watch and analyze live streams or recordings from web browsers, desktop clients, or mobile apps.

Centralized, secure, and scalable surveillance

Batch and automated camera deployment

Automatically locate cameras within a set IP range or configure units in batch by importing spreadsheets and conveniently replicate settings to new cameras.

Instant event streaming on multi-location maps

Preview footage directly on multi-floor, multi-location maps when events are detected to stay on top of your deployment, with Google Maps and OpenStreetMap integration to make geographically spread-out deployments easier to monitor.

Dual recording, locally and to the cloud

Record each camera’s footage to two Synology servers simultaneously for added redundancy and instant access — for instance, to a smaller device at the edge and a larger central management server. Stream feeds directly to the cloud with C2 Backup for Surveillance for fast access and convenient sharing whenever you need evidence.3

Event detection and smart analytics options

Add support for deep learning-powered algorithms and detection profiles such as intrusion detection, license plate recognition, congestion alerts, and face recognition by joining Deep Learning NVR servers to your deployment.

Advanced deployment and analysis options

Get more with DiskStation Manager

Take advantage of a host of native productivity, management, and security solutions available in the web-based Synology DSM operating system.

Synology has you covered

Synology has you covered

The HD6500 is backed by Synology's 5-year limited warranty,5 including technical support and hardware replacement services to maximize your return on investment and ensure continued high-quality performance. Learn more

Performance backed by Synology drives

Leverage high sustained performance and reliability with enterprise-grade drives with built-in data protection designed for Synology systems.

img enterprise-has

Get Started

We're here to assist you with any questions or information you may require.

High Density HD6500

productHD6500front view photo
productHD6500back view photo
productHD6500back view photo
  • 1Power Button and Indicator
  • 2Status Indicator
  • 3Alert Indicator
  • 4Mute Button
  • 5System Drive Status Indicators
  • 6System Drive Trays
  • 7PSU Fans
  • 8Power Port
  • 9PSU Indicators
  • 10Console Port
  • 11Reset Button
  • 121GbE RJ-45 Ports
  • 1310GbE RJ-45 Ports
  • 14Management Port
  • 15USB 3.2 Gen 1 port
  • 16PCI Express Expansion Slots
  • 17SAS OUT Port (Primary)
  • 18SAS OUT Port (secondary)
  • 19Drive Trays
  • 20Drive status indicator


  1. Performance figures are obtained through internal testing by Synology. Actual performance may vary depending on the testing environment, usage, and configuration. See performance charts for more information.

  2. PCIe add-in cards, expansion units, and storage drives are sold separately. Refer to the compatibility list for compatible devices.

  3. C2 Storage for Hyper Backup and Hybrid Share requires purchase of an eligible annual or monthly subscription. A free trial is available for each newly registered device.

  4. Surveillance Station includes 2 free licenses. Connecting more cameras and devices requires additional licenses. Learn more

  5. The warranty period starts from the date of purchase as stated on your purchase receipt. Visit https://www.synology.com/company/legal/warranty for more information.

Hardware Specifications
CPU Model Intel Xeon Silver 4210R
CPU Quantity 2
CPU Core 10
CPU Architecture 64-bit
CPU Frequency 2.4 (base) / 3.2 (turbo) GHz
Hardware Encryption Engine
System Memory 64 GB DDR4 ECC RDIMM
Memory Module Pre-installed 64 GB (32 GB x 2)
Total Memory Slots 16
Maximum Memory Capacity 512 GB (32 GB x 16)
  • Synology reserves the right to replace memory modules with the same or higher frequency based on supplier's product life cycle status. Rest assured that the compatibility and stability have been strictly verified with the same benchmark to ensure identical performance.
  • Please select Synology memory modules for optimum compatibility and reliability. Synology will not provide complete product warranty or technical support if non-Synology memory modules are used for memory expansion.
  • For more information about the recommended memory configurations, please check the Hardware Installation Guide of your Synology product.
Drive Bays 60
Maximum Drive Bays with Expansion Unit 300 (RX6022sas x 4)
SAS multipathing
Compatible Drive Type* (See all supported drives)
  • 3.5" SAS HDD
  • 2.5" SATA SSD
Hot Swappable Drive*
  • Synology only guarantees full functionality, reliability, and performance for Synology drives listed on the compatibility list. The use of non-validated components may limit certain functionality and result in data loss and system instability.
  • Two Synology SATA SSDs are included in the accessory pack for use as system drives.
  • To install 2.5" SATA SSDs, optional 2.5" drive trays (R5) must be purchased separately. Learn more
External Ports
External Ports
RJ-45 1GbE LAN Port 2
RJ-45 10GbE LAN Port 2
Out-of-Band Management LAN Port 1
Max. Number of LAN Ports 15
USB 3.2 Gen 1 Port* 2
Expansion Port 2
Expansion Port Type Mini-SAS HD
  • The USB 3.0 standard was renamed to USB 3.2 Gen 1 by the USB Implementers Forum (USB-IF) in 2019.
  • Besides the 5 built-in LAN ports, up to 10 additional LAN ports can be made available by installing compatible network interface cards (sold separately).
PCIe Expansion
  • 2 x Gen3 x16 slot (x16 link)
  • 2 x Gen3 x8 slots (x8 link)
Form Factor (RU) 4U
Size (Height x Width x Depth) 176 mm x 482 mm x 1020 mm
Weight 37.9 kg
Rack Installation Support* 4-post 19" rack (Synology Rail Kit - RKS-03)
System Fan 80 mm x 80 mm x 4 pcs
Fan Speed Mode
  • Full-Speed Mode
  • Cool Mode
  • Quiet Mode
Easy Replacement System Fan
Power Recovery
Noise Level* 60.8 dB(A)
Scheduled Power On / Off
Wake on LAN / WAN
Power Supply Unit / Adapter 1600 watts
Redundant Power Supply
AC Input Power Voltage 200V to 240V AC
Power Frequency 50/60 Hz, Single Phase
Power Consumption 1025.2 watts (Access)
418 watts (HDD Hibernation)
British Thermal Unit 3495.93 BTU/hr (Access)
1425.38 BTU/hr (HDD Hibernation)
  • Noise Level Testing Environment: Fully loaded with Synology HAS5300-8T hard drive(s) in the idle state. Two G.R.A.S. Type 40AE microphones, each set up 1 meter away from the Synology NAS at the front and rear. Background noise: 16.49-17.51 dB(A); Temperature: 24.25-25.75˚C; Humidity: 58.2-61.8%
  • Power consumption is measured when it is fully loaded with Synology 8TB HAS5300-8T hard drive(s).
Operating Temperature 0°C to 35°C (32°F to 95°F)
Storage Temperature -20°C to 60°C (-5°F to 140°F)
Relative Humidity 5% to 95% RH
  • FCC
  • CE
  • BSMI
  • VCCI
  • RCM
  • UKCA
  • EAC
  • KC
  • UL
5 Years
Notes The warranty period starts from the purchase date as stated on your purchase receipt. (Learn more)
RoHS Compliant
Packaging Content
Packaging Content
  • Main Unit X 1
  • Synology SATA SSD X 2
  • Rail Kit Sliding: RKS-03 X 1
  • Accessory Pack X 1
  • AC Power Cord X 2
  • Quick Installation Guide X 1
Optional Accessories
Optional Accessories
Notes To install 2.5" SATA SSDs, optional 2.5" drive trays (R5) must be purchased separately. Learn more


  1. Model specifications are subject to change without prior notice.
  2. The figures are based on Synology internal testing. Each performance test is done individually. No other services or applications are processed at the same time.
  3. The actual performance may be lower than lab testing figure due to differences in server configuration, deployment, and the number of active operations.
  4. If usage requirements exceed the specifications above, please contact our regional partners for professional advice.