Synology RackStation RS4021XS+ 16-bay Rackmount NAS for SMB

Condition: New
In stock


Brand: Synology
Synology RackStation RS4021XS+ 16-bay Rackmount NAS for SMB


  • Mfr Part Number: RS4021XS+
  • Hardware:
    • CPU: Intel Xeon D-1541 8-core (16-thread) 2.1 GHz, Turbo Boost up to 2.7 GHz
    • Hardware encryption engine: Yes (AES-NI)
    • Memory: 16 GB DDR4 ECC UDIMM (expandable up to 64 GB)
    • Compatible Drive Bays: 16 x 3.5" or 2.5" SATA HDD/SSD (drives not included) 
    • Hot Swappable Drive: Yes 
    • External Ports: 2 x USB 3.2 Gen 1 ports; 2 x Expansion ports (Infiniband)
    • Form Factor: Rackmount 3U
    • LAN Ports: 4 x 1GbE RJ-45; 2 x 10GbE RJ-45
    • Wake on LAN/WAN: Yes 
    • PCIe 3.0 slots: 2 x 8-lane x8 slots; Supports network interface cards and M.2 NVMe SSD adapter cards for SSD cache
    • Scheduled Power On/Off: Yes 
    • System Fan: 3 x (80 x 80 x 32 mm)
    • AC Input Power Voltage: 100V to 240V AC
    • Power Frequency: 50/60 Hz, single phase
  • Networking Protocols: SMB, AFP, NFS, FTP, WebDAV, CalDAV, iSCSI, Telnet, SSH, SNMP, VPN (PPTP, OpenVPN, L2TP)
  • File System:
    • Internal Drives: Btrfs, ext4
    • External Drives: Btrfs, ext4, ext3, FAT32, NTFS, HFS+, exFAT
  • Storage management
    • Maximum single volume size: 108/200 TB
    • Maximum system snapshots: 65,536
    • Maximum internal volumes: 256
  • SSD cache
    • Read/write cache support
    • 2.5" SATA SSD support
    • M.2 NVMe SSD support
  • File Sharing Capabilities:
    • Max Local User Accounts: 16,000 
    • Maximum Local Groups: 512
    • Max Shared Folders: 512
    • Max Concurrent SMB/NFS/AFP/FTP Connections: 4,000
  • Directory services: Connects with Windows AD/LDAP servers enabling domain users to login via SMB/NFS/AFP/FTP/File Station using their existing credentials.
  • Security: Firewall, shared folder encryption, SMB encryption, FTP over SSL/TLS, SFTP, rsync over SSH, login auto block, Let's Encrypt support, HTTPS (customizable cipher suite) 
  • Supported clients: Windows 7 onwards, macOS 10.12 onwards
  • Applications:
    • Drive: Synchronizes files across Windows, macOS, Linux, Android and iOS. The built-in cross-platform portal allows access to
      data anytime and anywhere
      - Maximum number of hosted files: 5,000,000
      - Maximum number of concurrent connections for PC clients: 2,000
    • File Station: Provides virtual drives, remote folders, Windows ACL editor, compression/extraction of archived files, bandwidth control for specific users/groups, creation of sharing links, and transfer logs
    • FTP Server: Supports bandwidth control for TCP connections, custom FTP passive port ranges, anonymous FTP, FTP over TLS/SSL and SFTP protocols, network booting with TFTP and PXE support, and transfer logs
    • Presto File Server: Enables high-speed data transfer over WAN through the exclusive SITA technology between Synology NAS and desktop
    • iOS/Android applications: Synology Drive, Synology MailPlus, Synology Chat, Synology LiveCam, Moments, DS audio, DS photo, DS video, DS cam, DS file, DS finder, DS note 
  • Power Consumption: 145.79 W (Access); 62.68 W (HDD Hibernation)
  • Certifications: FCC, CE, BSMI, VCCI, RCM, EAC, CCC, KC, UL
  • Environment Safety: RoHS Compliant
  • Package Contents:
    • 1 x RS4021xs+ main unit
    • 1 x Quick Installation Guide
    • 1 x Accessory pack
    • 2 x AC power cords
  • Optional Accessories: 
    • DDR4 ECC UDIMM: D4EC-2666-16G
    • RKS1317 Rail Kit
    • 10GbE Network Interface Cards: E10G18-T2/E10G18-T1/E10G17-F2
    • M.2 SSD & 10GbE Combo Adapter Card: E10M20-T1
    • M.2 SSD Adapter Card: M2D20
    • M.2 NVMe SSDs: SNV3500
    • 2.5" SATA SSD: SAT5200
    • 3.5" SATA HDD: HAT5300
    • Expansion Unit: RX1217(RP)
    • VisualStation units: VS960HD, VS360HD
    • Virtual DSM License Pack
    • MailPlus License Pack
    • Surveillance Device License Pack
  • Dimensions (HxWxD): 132.3 x 482 x 656.5 mm (with server handles)
  • Weight: 17.4 kg
  • Warranty: 5 Years
Condition: New
Mfg Part #:
Part #:

Good to know