Synology RackStation RS4021XS+ 16-bay Rackmount NAS for SMB

Specifications

• 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