Synology RackStation RS4021xs+ - NAS Server - 0GB - 16 Bay - Rack-mountable 3U

£ 4,501.98  inc. vat

£ 3,751.65 ex. vat

Synology RackStation RS4021xs+ - NAS Server - 0GB - 16 Bay - Rack-mountable 3U

QuickFind: 1138451 Mfr part code: RS4021XS+
  • SATA 6Gb/s
  • RAID 0, 1, 5, 6, 10, JBOD, 5 hot spare, 6 hot spare, 10 hot spare, 1 hot spare, RAID F1, F1 hot...
  • RAM 16 GB
  • Gigabit Ethernet / 10 Gigabit Ethernet

Product Description

Synology RackStation RS4021xs+ - NAS Server - 0GB - 16 Bay - Rack-mountable 3U

Enterprise NAS with built-in service continuity engineered for data-intensive applications.
  • Securing your business assets
  • The 16-bay RS4021xs+ provides solid data security and lightning-fast performance. Together with its 8-core processor,ECC memory,advanced snapshot technology,and built-in 10GbE connectivity,the RS4021xs+ can support large multi-user environments while handling data-intensive workloads.
  • Engineered for service continuity
  • The RS4021xs+ ensures mission-critical data is always available,enabling businesses to deliver great results,even in the face of disaster.
  • Redundant power
  • Dual PSUs provide protection against a PSU failure or accidental cord removal while hot-swappable fans can be replaced without powering down the system.
  • Maximize service availability
  • Synology High Availability (SHA) pairs two identical units together creating an active-passive cluster with minute-level failover.
  • Next-generation file system
  • Btrfs prevents data corruption and reduces maintenance overheads with advanced storage technologies and optimized snapshots.
  • Customized to your business
  • The RS4021xs+ includes two PCIe slots for performance,networking,and storage upgrades enabling it to adapt to any business environment.
  • Hyper Backup
  • A comprehensive backup and recovery solution for securing data stored on Synology servers. Backup data locally,to another Synology device,rsync server,or cloud-based storage such as Google Drive,Dropbox,S3-compatible destinations,and Synology C2. Deduplication,integrity checks,and incremental transfer technology reduce bandwidth and storage use.
  • Snapshot replication
  • Easily schedule flexible point-in-time backups of shared folders and iSCSI LUNs with an RPO as low as 5 minutes and recovery in seconds. Set up replication and failover to other Synology storage systems for fast RTOs and minimal service disruption.
  • Active backup suite
  • Enables administrators to easily backup the entire IT infrastructure to their NAS,including Windows and Linux workstations and servers,file servers,VMware and Hyper-V virtual machines,and Microsoft 365 and Google Workspace accounts. Backups benefit from deduplication,multiversioning,and optimizations to reduce bandwidth and storage used.

Technical Specification

Synology RackStation RS4021xs+ - NAS Server - 0GB - 16 Bay - Rack-mountable 3U


Device Type NAS server
Host Connectivity Gigabit Ethernet / 10 Gigabit Ethernet
Enclosure Type Rack-mountable - 3U
Total Storage Capacity 0 GB
Installed Devices / Modules Qty 0 (installed) / 16 (max)
Width 48.2 cm
Depth 65.65 cm
Height 13.23 cm
Weight 17.4 kg

Processor / Memory

Processors Installed 1 x Intel Xeon D-1541 2.1 GHz
Number of Cores 8-core
Max Supported Qty 1
Max Turbo Speed 2.7 GHz
RAM 16 GB (installed) / 64 GB (supported) - DDR4

Storage Controller

Interface Type SATA 6Gb/s
RAID Level RAID 0, RAID 1, RAID 5, RAID 6, RAID 10, JBOD, RAID 5 hot spare, RAID 6 hot spare, RAID 10 hot spare, RAID 1 hot spare, RAID F1, RAID F1 hot spare


Data Link Protocol GigE, 10 GigE
Network / Transport Protocol PPTP, L2TP, iSCSI, SMTP, FTP, DHCP, POP3, IMAP
Remote Management Protocol SNMP, Telnet, HTTPS
Network Services Compatibility Microsoft Active Directory (AD), Network File System (NFS), Server Message Block (SMB), Apple File Protocol (AFP), Web-based Distributed Authoring and Versioning (WebDAV), Calendaring Extensions to WebDAV (CalDAV)
Features Firewall protection, VPN support, LDAP support, VLAN support, wake on LAN (WOL), print server, antivirus analysis, High Availability, web server, backup server, file sharing, event log, Access Control List (ACL) support, iTunes server, DHCP server, FTP server, BitTorrent Client, e-mail server, bandwidth control, surveillance station, eMule client, e-mail notification
Encryption Algorithm 256-bit AES
Compliant Standards DLNA CERTIFIED

Expansion / Connectivity

Expansion Bays 16 (total) / 16 (free) x hot-swap - 2.5" / 3.5"
Expansion Slots 2 (total) / 2 (free) x PCI Express 3.0 x8 ¦ 4 (total) / 3 (free) x DIMM 288-pin
Interfaces 4 x Ethernet 1000Base-T - RJ-45 ¦ 2 x USB 3.2 Gen 1 - Type A ¦ 2 x Ethernet 10Gb - RJ-45 ¦ 2 x expansion port ¦ 1 x management


Compliant Standards UL, VCCI, BSMI, CCC, FCC, RoHS, KC, EAC, RCM
Included Accessories Accessory pack


Power Device Internal power supply
Installed Qty 2
Max Supported Qty 2
Power Redundancy Yes
Power Redundancy Scheme 1+1
Voltage Required AC 120/230 V (50/60 Hz)
Power Consumption Operational 145.79 Watt
Power Provided 800 Watt

Manufacturer Warranty

Service & Support Limited warranty - 5 years

Environmental Parameters

Min Operating Temperature 0 °C
Max Operating Temperature 35 °C
Humidity Range Operating 5 - 95%
Sound Emission 50.2 dBA

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Synology RackStation RS4021xs+ - NAS Server - 0GB - 16 Bay - Rack-mountable 3U

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Synology RackStation RS4021xs+ - NAS Server - 0GB - 16 Bay - Rack-mountable 3U

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£ 4,501.98  inc. vat

£ 3,751.65 ex. vat

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