SYNOLOGY RackStation RS4021xs+ NAS 16-Bay

Business NAS with built-in failover for data-intensive enterprise applications

Scope of application	Medium to large enterprises: can host sophisticated services, such as virtualisation, email. Enables optimal office collaboration and facilitates monitoring devices working reliably.
number of drive trays	16
Compatible drive types	3.5" SATA HDD  2,5" SATA SSD
RAM	16 GB DDR4 ECC UDIMM, number of slots: 4
CPU	model: Intel Xeon D-1541 frequency: 8-core 2.1 (Basis) / 2.7 (Turbo) GHz architecture: 64-bit
Ports	6x RJ-45 1GbE LAN-Port 2x USB 3.0 Port 2x Expansion Port

Reliable performance for your business
The 16-bay RS4021xs+ delivers robust data protection and lightning-fast performance with over 234,000 4K random read IOPS and 6,258 MB/s sequential read throughput1. With an 8-core processor, ECC memory, advanced snapshot technology and built-in 10GbE connectivity, the RS4021xs+ is well suited for data-intensive workloads in multi-user IT environments.

Designed for resilience
The RS4021xs+ ensures that critical data is always available and organisations can deliver the best results even in emergencies.

Redundant power supply
Redundant power supplies ensure uninterrupted operation even if a power supply fails or a plug is accidentally pulled, and fans can be hot-swapped without shutting down the system.

Maximum Availability
Synology High Availability (SHA) couples two identical models into an active/passive cluster with failover in minutes.

Next generation file system.
Btrfs prevents file corruption and reduces maintenance with advanced storage technologies and optimised snapshots.

Adapts to your business
The RS4021xs+ has two PCIe slots that allow you to further increase performance, network bandwidth and storage capacity as needed2.

Double the bandwidth
With Synology's 10GbE network cards, you can double or more network bandwidth in minutes.

SSD Cache
Increase read/write IOPS by up to 16x with SSD cache using our Synology M.2 NVMe adapter cards and SNV3500 SSDs or one or more 2.5" SAT5200 SSDs.

Scalable storage capacity
Quickly and easily expand up to 40 drives with two RX1217(RP) expansion units.

Licence-free data protection solutions:

- For emergencies: HyperBackup and Snapshot Replication
- Backup of the entire IT infrastructure: Active Backup Suite

Fully certified storage virtualisation solutions
Synology iSCSI Storage offers full support of popular virtualisation solutions to improve work efficiency with a simple management interface. Storage operations can be offloaded through VMware vSphere 6 and VAAI integration. Windows Offloaded Data Transfer (ODX) accelerates data transfer. OpenStack Cinder support allows your Synology NAS to be used as a block-based storage component. In addition, the Synology Storage Console further simplifies the provisioning and management of storage in VMware and Windows environments.

Complete solution for surveillance
With Synology Surveillance Station, the RS4021xs+ becomes a versatile network video recorder. With support for up to 90 IP cameras5 and video analytics features such as motion detection, "no standing zone", foreign object detection, and abnormality detection, you're ready for the most common surveillance deployments. Learn more

Safe and private
AES-256 encryption protects locally stored recordings.

Access anywhere, anytime
Access recordings and livestreams anytime via web browser, desktop client or DS cam mobile app.

Alert in real time
The system notifies you via email, SMS or push notification when incidents or predefined conditions occur.

Optional accessories

• DDR4 ECC UDIMM: 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
• Rack rails sliding: RKS1317
• VisualStation: VS960HD/VS360HD
• Monitoring device Device licence package

Size (height x width x depth): 132.3 mm x 482 mm x 656.5 mm

! We also offer

• compatible


• high-quality


• well-priced

RAM modules for this Synology device.
Just get in touch with our salesteam!

Warranty: 5-year limited warranty
Warranty period extensions (EW+ products) can be purchased through your own Synology account.

You can also obtain all variants of Synology Support Packs from us:
Synology Onsite Support Pack	In case of failure, you will receive on-site support from a technician within only a few hours
Synology Onsite Post warranty Support Pack	Subsequent on-site service for a previously purchased hardware package!
Synology NBD Replacement Support Pack	In the event of a warranty claim, a replacement unit will be delivered to you the next business day!
For further information please contact our sales department!