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    Synology RackStation RS819 4 Bay Entry-level Rackmount NAS Supporting Snapshot Technology

    Manufacturer: Synology
    Brand Synology Wi-Fi No Hard Disk Capacity No Capacity Warranty 7 Day Replacement LAN Yes AC Powerd Yes USB Version 2.0, 3.0
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    Fast storage with outstanding computing power

    RS819 is a compact and scalable 4-bay rackmount NAS in a 1U form factor. With snapshot technology support, RS819 brings business workgroups simple yet comprehensive solutions to data management, sharing, synchronization and backup.


    Download Datasheet


    64-bit quad-core 1.4 GHz


    2GB DDR4


    Dual 1GbE LAN ports

    High Performance

    Over 224 MB/s encrypted reading performance

    Meet the space-saving rackmount server for deployment

    RS819 supports up to 8 drives when connecting with one RX418 expansion unit. Since both RS819 and RX418 are only 12 inches in depth, they can fit perfectly in a 2-post or wall mount rack.


    Compact chassis design capable of fitting in a 2-post rack


    The 2-post rack mount is easy to assemble and space-saving, allowing you to set up anywhere


    Cost-efficient server deployment without unnecessary investment in rail kits and server facilities


    Ultimate file management and sharing

    File Station is a web-based, fast and secure management tool built to allow easy, drag-and-drop operations without requiring any complex setup on Mac or PC. Advanced search and filtering tools allow for easy organization and file sharing. For complete compatibility, RS819 supports the following protocols: AFP, FTP, iSCSI, NFS, SMB, and WebDAV.


    Btrfs: Next generation storage efficiency

    Btrfs file system introduces the most advanced storage technologies to meet the management needs of modern large scale businesses:






    Flexible Shared Folder/User Quota System provides comprehensive quota control on all user accounts and shared folders



    Snapshot Replication provides schedulable and storage capacity-saving data protection with 256 shared folder backups and 4,096 system-wide snapshots



    File or folder level data restoration makes data recovery fast and flexible



    Automatic file self-healing detects and recovers corrupted files without user intervention




    Learn more about the benefits of using Btrfs

    Digital asset protection

    Powered by Synology DiskStation Manager (DSM), Synology NAS offers advanced security measures to protect against sudden data loss and potential security holes. Learn more


    Security Advisor

    Analyze system settings, password strength and network preferences, and remove any possible malware.



    A kernel-level enhancement that blocks malicious programs from accessing unauthorized system resources.


    AES 256-bit encryption

    Encrypt shared folders and network data transmission to avoid unauthorized data access.


    2-step verification

    Prevent others from logging in to your DSM by generating a six-digit one-time password (OTP) on your mobile device.


    Trust level

    Customize the trust level in Package Center to avoid installing packages from untrusted sources, safeguarding your NAS from unknown or tampered package files.


    Engineered for reliability, backed by Synology

    RS819 is designed to reliably store your data and is backed by Synology's three-year hardware warranty. An optional two-year extended warranty is available in select regions for up to five years of coverage. Learn more

    Powered by Synology DSM

    DSM UI

    Award-winning operating system with an intuitive user interface and powerful capabilities.


    Learn more


    Public Cloud Integration

    Backup and synchronize data easily between your public cloud accounts and your NAS.


    Learn more


    Synology Drive

    A versatile solution for file management and synchronization.


    Learn more


    All-in-one server

    Save additional investment by integrating various network services, web/mail services, management applications into your NAS.


    Learn more


    Snapshot Replication

    Schedulable and instantaneous data protection of shared folders and iSCSI LUNs for disaster prevention.


    Learn more



    Comprehensive built-in security tools are constantly updated to protect your devices against evolving threats.


    Learn more




    1Power button and indicator


    2LAN indicator


    3Drive status indicator


    4Beep off button


    5Status indicator


    6Drive tray


    7Console port




    9Power port


    101GbE RJ-45 port


    11USB 3.0 port


    12eSATA port


    13Reset button


    Hardware Specs


    CPU CPU Model Realtek RTD1296
      CPU Architecture 64-bit
      CPU Frequency Quad Core 1.4 GHz
      Hardware Encryption Engine  

    System Memory 2 GB DDR4
      Notes 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.

    Drive Bays 4
      Maximum Drive Bays with Expansion Unit 8
      Compatible Drive Type* (See all supported drives)

    3.5" SATA HDD

    2.5" SATA HDD

    2.5" SATA SSD

      Maximum Internal Raw Capacity 64 TB (16 TB drive x 4) (Capacity may vary by RAID types)
      Maximum Raw Capacity with Expansion Units 128 TB (64 TB + 16 TB drive x 4) (Capacity may vary by RAID types)
      Maximum Single Volume Size* 108 TB
      Hot Swappable Drive  

    "Compatible drive type" indicates the drives that have been tested to be compatible with Synology products. This term does not indicate the maximum connection speed of each drive bay.

    The maximum raw capacity is not limited by the maximum single volume size. Synology NAS models may utilize capacities over the maximum single volume size as long as each volume created is below the limit. (Learn more)

    External Ports
    RJ-45 1GbE LAN Port 2 (with Link Aggregation / Failover support)
      USB 3.0 Port 2
      eSATA Port 1

    File System
    Internal Drives



      External Drives








      Notes exFAT Access is purchased separately in Package Center.

    Form Factor (RU) 1U
      Size (Height x Width x Depth) 44 mm x 478 mm x 327.5 mm
      Weight 4.34 kg
      Rack Installation Support

    2-post 19" rack (direct mounting)

    4-post 19" rack (Synology Rail Kit - RKM114/RKS1317)

      Notes The rail kit is sold separately

    System Fan 40 mm x 40 mm x 3 pcs
      Fan Speed Mode

    Full-Speed Mode

    Cool Mode

    Quiet Mode

      Power Recovery  
      Noise Level* 28.9 dB(A)
      Scheduled Power On / Off  
      Wake on LAN / WAN  
      Power Supply Unit / Adapter 100 W
      AC Input Power Voltage 100 V to 240 V AC
      Power Frequency 50/60 Hz, Single Phase
      Power Consumption* 28.31 W (Access)
    10.1 W (HDD Hibernation)
      British Thermal Unit 96.6 BTU/hr (Access)
    34.46 BTU/hr (HDD Hibernation)
      Notes Power consumption is measured when fully loaded with Western Digital 1TB WD10EFRX hard drive(s).

    Operating Temperature 5°C to 35°C (40°F to 95°F)
      Storage Temperature -20°C to 60°C (-5°F to 140°F)
      Relative Humidity 5% to 95% RH









    RoHS Compliant

    Packaging Content

    Main Unit X 1

    Accessory Pack X 1

    AC Power Cord X 1

    Quick Installation Guide X 1

    Optional Accessories

    Surveillance Device License Pack

    Expansion Unit: RX418 X 1

    Synology Rail Kit Sliding - RKS1317

    Synology Rail Kit Mounted - RKM114










    Software Specs


    DSM Specifications

    Storage Management
    Maximum Internal Volume Number 64
      Maximum iSCSI Target Number 10
      Maximum iSCSI LUN 10
      iSCSI LUN Clone/Snapshot, Windows ODX  
      SSD TRIM  
      Supported RAID Type

    Synology Hybrid RAID



    RAID 0

    RAID 1

    RAID 5

    RAID 6

    RAID 10

      RAID Migration

    Basic to RAID 1

    Basic to RAID 5

    RAID 1 to RAID 5

    RAID 5 to RAID 6

      Volume Expansion with Larger HDDs

    Synology Hybrid RAID

    RAID 1

    RAID 5

    RAID 6

    RAID 10

      Volume Expansion by Adding a HDD

    Synology Hybrid RAID


    RAID 5

    RAID 6 (with Expansion Unit)

    RAID 10 (with Expansion Unit)

      Global Hot Spare Supported RAID Type

    Synology Hybrid RAID

    RAID 1

    RAID 5

    RAID 6 (with Expansion Unit)

    RAID 10 (with Expansion Unit)

    File Services
    File Protocol CIFS/AFP/NFS/FTP/WebDAV
      Maximum Concurrent CIFS/AFP/FTP Connections 200
      Windows Access Control List (ACL) Integration  
      NFS Kerberos Authentication  

    Account & Shared Folder
    Maximum Local User Accounts 2,048
      Maximum Local Groups 256
      Maximum Shared Folder 256
      Maximum Shared Folder Sync Tasks 4

    Log Center
    Syslog Events per Second 400

    General Specifications
    Networking Protocols SMB1 (CIFS), SMB2, SMB3, NFSv3, NFSv4, NFSv4.1, NFS Kerberized sessions, iSCSI, HTTP, HTTPs, FTP, SNMP, LDAP, CalDAV
      Supported Browsers




    Internet Explorer 10 onwards

    Safari 10 onwards

    Safari (iOS 10 onwards)

    Chrome (Android 6.0 onwards)

      Supported Language English, Deutsch, Français, Italiano, Español, Dansk, Norsk, Svenska, Nederlands, Русский, Polski, Magyar, Português do Brasil, Português Europeu, Türkçe, Český, ภาษาไทย, 日本語, 한국어, 繁體中文, 简体中文

    Add-on Packages view the complete package list

    Synology Chat
    Maximum Users 500

    The number of concurrent HTTP connections for Synology Chat was configured to the maximum.

    CPU and RAM usage were both under 80% when the number of maximum users was reached.

    Cloud Station Server
    Recommended Number of Hosted Files 100,000
      Recommended Number of Concurrent Sync Clients 200 (the number of connections that can be maintained when the recommended number of hosted files was reached)

    The maximum number of concurrently connected devices refers to the maximum number of devices that can remain connected at the same time.

    The maximum number of hosted files refers to the maximum number of files that can be indexed and hosted by the Cloud Station Server service. RAM expansion was not used during testing.

    Non-encrypted shared folders were used during the aforementioned testing.

    Download Station
    Maximum Concurrent Download Tasks 80

    exFAT Access (Optional)

    Media Server
    DLNA Compliance  

    Facial Recognition  
      Subject Recognition  

    Snapshot Replication
    Maximum Snapshots per Shared Folder 256
      Maximum of System Snapshots 4,096

    Surveillance Station
    Maximum IP cam (Licenses required) 30 (including 2 Free License) (See All Supported IP Cameras)
      Total FPS (H.264)* 900 FPS @ 720p (1280x720)
    300 FPS @ 1080p (1920x1080)
    240 FPS @ 3M (2048x1536)
    150 FPS @ 5M (2591x1944)
    110 FPS @ 4K (3840x2160)
      Total FPS (H.265)* 900 FPS @ 720p (1280x720)
    450 FPS @ 1080p (1920x1080)
    360 FPS @ 3M (2048x1536)
    250 FPS @ 5M (2591x1944)
    180 FPS @ 4K (3840x2160)
      Total FPS (MJPEG)* 300 FPS @ 720p (1280x720)
    200 FPS @ 1080p (1920x1080)
    130 FPS @ 3M (2048x1536)
    80 FPS @ 5M (2591x1944)
      Notes Surveillance Station throughput is tested with Axis network camera, using continuous recording with live view from Surveillance Station and motion detection by camera. Live view and recording are sharing the same stream from the camera.

    Synology Drive
    Recommended Number of Hosted Files 100,000 (applies to files indexed or hosted by Synology Drive. For file access through other standard protocols, refer to the File Services section above)
      Recommended Number of Concurrent Sync Clients 200 (the number of connections that can be maintained when the recommended number of hosted files was reached)

    Exceeding the limits above may result in longer response time in file operations.

    Btrfs file system and non-encrypted shared folders were used during the aforementioned testing.

    Synology Office
    Maximum Users 200

    Multiple files were opened for testing and each file was edited by 30 users simultaneously.

    CPU and RAM usage were both under 80% when the number of maximum users was reached.

    Client performance may affect maximum simultaneous editing users. Client PCs used for testing: Intel Core i3-3220 / 8GB RAM

    Video Station
    Video Transcoding Group 2 (See more)

    VPN Server
    Maximum Connections 20
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