Synology RS3621xs+

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  • Synology RS3621xs+
  • CPU

    CPU Model Intel Xeon D-1541
      CPU Architecture 64-bit
      CPU Frequency 8-core 2.1 (base) / 2.7 (turbo) GHz
      Hardware Encryption Engine (AES-NI)  


    System Memory 8 GB DDR4 ECC UDIMM
      Memory Module Pre-installed 8 GB (8 GB x 1)
      Total Memory Slots 4
      Maximum Memory Capacity 64 GB (16 GB x 4)
    • 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 on the recommended memory configurations, visit here.
    • 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 12
      Maximum Drive Bays with Expansion Unit 36 (RX1217/RX1217RP x 2)
      Compatible Drive Type*
    • 3.5" SATA HDD
    • 2.5" SATA SSD
      Maximum Single Volume Size*
    • 200 TB (32 GB RAM required, for RAID 5 or RAID 6 groups only)
    • 108 TB
      Hot Swappable Drive  
    • Storage Pool and volume creation require all drives to be listed as compatible on the device model's compatibility list.
    • "Compatible drive type" indicates drives that have been tested to be compatible with Synology products. This term does not indicate the maximum connection speed of each drive bay.
    • Each internal volume (may consist of multiple drives) is expandable up to 108 TB (with memory less than 32 GB) or 200 TB (with memory equal to or greater than 32 GB).

    External Ports

    RJ-45 1GbE LAN Port 4 (with Link Aggregation / Failover support)
      RJ-45 10GbE LAN Port 2 (with Link Aggregation / Failover support)
      USB 3.2 Gen 1 Port* 2
      Expansion Port 2
      Notes The USB 3.0 standard was renamed to USB 3.2 Gen 1 by the USB Implementers Forum (USB-IF) in 2019.


    PCIe Expansion 2 x Gen3 x8 slots (x8 link)

    File System

    Internal Drives
    • Btrfs
    • EXT4
      External Drives
    • Btrfs
    • EXT4
    • EXT3
    • FAT
    • NTFS
    • HFS+
    • exFAT*
      Notes exFAT Access is purchased separately in Package Center.


    Form Factor (RU) 2U
      Size (Height x Width x Depth) 88 mm x 482 mm x 724 mm
      Weight 14.5 kg
      Rack Installation Support* 4-post 19" rack (Synology Rail Kit - RKS1317)
      Notes The rail kit is sold separately


    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* 50.2 dB(A)
      Scheduled Power On / Off  
      Wake on LAN / WAN  
      Power Supply Unit / Adapter 500 W
      Redundant Power Supply  
      AC Input Power Voltage 100 V to 240 V AC
      Power Frequency 50/60 Hz, Single Phase
      Power Consumption* 142.5 W (Access)
    72.76 W (HDD Hibernation)
      British Thermal Unit 485.93 BTU/hr (Access)
    248.11 BTU/hr (HDD Hibernation)
    • Power consumption is measured when it is fully loaded with Synology 8TB HAT5300-8T hard drive(s).
    • Noise Level Testing Environment: Fully loaded with Seagate 2TB ST2000VN000 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%


    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
    • EAC
    • CCC
    • KC
    • UL


    5 Years
      Notes The warranty period starts from the purchase date as stated on your purchase receipt.


    RoHS Compliant

    Packaging Content

    • Main Unit X 1
    • Accessory Pack X 1
    • AC Power Cord X 2
    • Quick Installation Guide X 1

    Optional Accessories

    • DDR4 ECC UDIMM: D4EC-2666-8G/D4EC-2666-16G
    • Expansion Units: RX1217/RX1217RP
    • 3.5" SATA HDD: HAT5300
    • 2.5" SATA SSD: SAT5200
    • M.2 SSD & 10GbE Combo Adapter Card: E10M20-T1
    • M.2 SSD Adapter Card: M2D20
    • 10GbE Network Interface Card: E10G18-T2/E10G18-T1/E10G17-F2
    • Rail Kit Sliding: RKS1317
    • VisualStation: VS960HD/VS360HD
    • Surveillance Device License Pack

    DSM Specifications

    Storage Management

    Maximum Internal Volume Number 256
      SSD Read / Write Cache   
      SSD TRIM  
      RAID Group  
      Supported RAID Type
    • RAID F1
    • Basic
    • JBOD
    • 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
    • RAID F1
    • RAID 1
    • RAID 5
    • RAID 6
    • RAID 10
      Volume Expansion by Adding a HDD
    • RAID F1
    • JBOD
    • RAID 5
    • RAID 6
      Global Hot Spare Supported RAID Type
    • RAID F1
    • RAID 1
    • RAID 5
    • RAID 6
    • RAID 10

    File Services

    File Protocol CIFS/AFP/NFS/FTP/WebDAV
      Maximum Concurrent CIFS/AFP/FTP Connections 2,000
      Maximum Concurrent CIFS/AFP/FTP Connections (with RAM expansion) 10,000
      Windows Access Control List (ACL) Integration  
      NFS Kerberos Authentication  
    • Regarding data concerning tests with RAM expansion, all memory slots are installed with the maximum capacity of supported RAM.
    • During testing, the maximum number of SSDs supported by this model is installed in a RAID 5 configuration.
    • The testing standard was based on the maximum number of concurrent connections supported by this model. During the testing, 25% of the connections were used to transfer files concurrently. The transfer process guaranteed that the connections were not interrupted; the minimum transfer speed was not guaranteed.

    Account & Shared Folder

    Maximum Local User Accounts 16,000
      Maximum Local Groups 512
      Maximum Shared Folder 512
      Maximum Shared Folder Sync Tasks 32

    High Availability

    Synology High Availability  

    Log Center

    Syslog Events per Second 3,000


    VMware vSphere with VAAI  
      Windows Server 2016  
      Windows Server 2019  
      Citrix Ready  

    General Specifications

    Networking Protocols SMB1 (CIFS), SMB2, SMB3, NFSv3, NFSv4, NFSv4.1, NFS Kerberized sessions, iSCSI, HTTP, HTTPs, FTP, SNMP, LDAP, CalDAV
      Supported Browsers
    • Google Chrome
    • Firefox
    • Microsoft Edge
    • Internet Explorer 10 onwards
    • Safari 10 onwards
    • Safari (iOS 10 onwards)
    • Google 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

    Antivirus by McAfee (Trial)


    Central Management System


    Synology Chat

    Maximum Users 6,000
    • The number of concurrent HTTP connections for Synology Chat was configured to the maximum.
    • For tested models with expandable memory, the maximum amount of RAM was installed.

    Document Viewer


    Download Station

    Maximum Concurrent Download Tasks 80

    exFAT Access (Optional)


    iSCSI Manager

    Maximum iSCSI Target Number 256
      Maximum iSCSI LUN 512
      iSCSI LUN Clone/Snapshot, Windows ODX  

    Synology MailPlus / MailPlus Server

    Free Email Accounts 5 (Licenses required for additional accounts)
      Maximum Number of Concurrent Users 800
      Maximum Server Performance 4,235,000 emails per day, approx. 129GB
    • Models with more than 4 bays were installed with two SSDs for SSD cache.
    • For tested models with expandable memory, the maximum amount of RAM was installed.
    • The performance of the mail system will slightly decrease in high-availability mode due to data synchronization between the two servers.
    • Functions that were enabled in all of the tests above: anti-spam, anti-virus, DNSBL, greylist, content scan, full-text search (English only).

    Media Server

    DLNA Compliance  


    Facial Recognition  
      Subject Recognition  
      Auto Color & Rotate  
      Moments Select  

    Snapshot Replication

    Maximum Snapshots per Shared Folder 1,024
      Maximum of System Snapshots 65,536

    Surveillance Station

    Maximum IP cam (Licenses required) 90 (including 2 Free License) (See All Supported IP Cameras)
      Total FPS (H.264) 2700 FPS @ 720p (1280x720)
    2250 FPS @ 1080p (1920x1080)
    1500 FPS @ 3M (2048x1536)
    900 FPS @ 5M (2591x1944)
    550 FPS @ 4K (3840x2160)
      Total FPS (H.265) 2700 FPS @ 720p (1280x720)
    2700 FPS @ 1080p (1920x1080)
    2250 FPS @ 3M (2048x1536)
    1500 FPS @ 5M (2591x1944)
    1080 FPS @ 4K (3840x2160)
    • 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.
    • The maximum channel number also includes devices installed on Virtual DSM.
    • Total FPS may be affected by other services running at the same time (e.g., archive tasks performed by Archive Vault).

    Synology Drive

    Recommended Number of Hosted Files 5,000,000 (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 2,000 (the number of connections that can be maintained when the recommended number of hosted files was reached)
    • Exceeding the recommended numbers above will not block application operations, but may result in longer response time.
    • Utilizing SSD cache can significantly improve performance.
    • For tested models with expandable memory, the maximum amount of RAM was installed.
    • Btrfs file system and non-encrypted shared folders were used during the aforementioned testing.

    Synology Office

    Maximum Users 3,000
    • Multiple files were opened for testing and each file was edited by 30 users simultaneously.
    • For tested models with expandable memory, the maximum amount of RAM was installed.
    • Client performance may affect maximum simultaneous editing users. Client PCs used for testing: Intel Core i3-3220 / 8GB RAM

    Video Station


    Virtual Machine Manager

    Recommended Virtual Machine Instances 16 (Learn more)
      Recommended Virtual DSM Number (Licenses required) 16 (including 1 Free License)
      Notes The specifications vary depending on system configuration and memory size.

    VPN Server

    Maximum Connections 40
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