Btrfs prevents data corruption and reduces maintenance overheads with advanced storage technologies and optimized snapshots.
Double bandwidth
Upgrade network bandwidth in minutes by 2x or more with Synology’s range of 10GbE NICs.
SSD cache3
Boost read/write IOPS by up to 16 times by enabling SSD cache with our Synology M.2 NVMe adapter cards and SNV3500 SSDs, or by installing one or more 2.5” SAT5200 SSDs.
Storage expansion
Quickly and easily scale up to 40 drives with two RX1217(RP) expansion units.
The ultimate backup solutions — license-free
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. Deduplication4, integrity checks, and incremental transfer technology reduce bandwidth and storage used.
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 & 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.
Storage for virtualization
Synology iSCSI storage supports mainstream virtualization solutions with an easy management interface to enhance usability. VMware vSphere 6.5 and VAAI integration helps offload storage operations. Windows Offloaded Data Transfer (ODX) speeds up data transfer. OpenStack Cinder support turns your Synology NAS into a block-based storage component. Additionally, Synology Storage Console enables even more simplified storage provisioning and management options in VMware and Windows environments.
All-in-one surveillance solution
Synology Surveillance Station transforms the RS4021xs+ into a feature-packed Network Video Recorder solution. Support for up to 90 IP cameras5 and video analytics such as motion detection, no idle zone, foreign object detection, and anomaly detection cater to the most common surveillance scenarios.
Secure and private
AES-256 encryption keeps locally-stored footage secure.
Access from anywhere, anytime
Access recordings and live streams whenever you want using a web browser, desktop client, or the DS cam mobile app.
Real-time alerts
Email, SMS, or push notifications alert you when incidents occur or predefined conditions are met.
Works best with Synology drives
Engineered to handle intensive 24/7 workloads, Synology drives consistently deliver top-grade performance.
Powered by Synology DiskStation Manager
The RS4021xs+ runs Synology DiskStation Manager (DSM), the web-based operating system equipped with powerful applications and services for business.
Central Management System
Conveniently manage your fleet of Synology NAS from a centralized console.
Synology Drive
Instantly access your NAS files across multiple devices whenever you want, wherever you are.
Collaboration Suite
Satisfy all team collaboration needs behind the safety of your own private cloud with Synology Office, Calendar, and Chat.
Virtual Machine Manager
Run various operating systems in isolated sandboxes. Seamlessly clone, store, and migrate virtual machines.
Security
Shield your Synology NAS from the most sophisticated threats with industry-leading security solutions.
Public Cloud Integration
Back up and synchronize data easily between public cloud accounts and your NAS.
Specifications
Hardware Specs
|
CPU
|
CPU Model |
Intel Xeon D-1541 |
|
CPU Quantity |
1 |
|
CPU Architecture |
64-bit |
|
CPU Frequency |
8-core 2.1 (base) / 2.7 (turbo) GHz |
|
Hardware Encryption Engine (AES-NI) |
✓
|
|
Memory
|
System Memory |
16 GB DDR4 ECC UDIMM |
|
Memory Module Pre-installed |
16 GB (16 GB x 1) |
|
Total Memory Slots |
4 |
|
Maximum Memory Capacity |
64 GB (16 GB x 4) |
|
Notes |
- 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.
- 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 about the recommended memory configurations, please check the Hardware Installation Guide of your Synology product.
|
|
Storage
|
Drive Bays |
16 |
|
Maximum Drive Bays with Expansion Unit |
40 (RX1217/RX1217RP x 2) |
|
Compatible Drive Type* (See all supported drives)
|
- 3.5" SATA HDD
- 2.5" SATA SSD
|
|
Hot Swappable Drive* |
✓
|
|
Notes |
- Synology only guarantees full functionality, reliability, and performance for Synology drives listed on the compatibility list. The use of non-validated components may limit certain functionality and result in data loss and system instability.
- "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.
|
|
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
|
PCIe Expansion |
2 x Gen3 x8 slots (x8 link) |
|
File System
|
Internal Drives |
|
|
External Drives |
- Btrfs
- EXT4
- EXT3
- FAT
- NTFS
- HFS+
- exFAT
|
|
Notes |
exFAT Access can be installed for free from Package Center in DSM 7.0. In DSM 6.2 or earlier versions, exFAT Access needs to be purchased in Package Center. |
|
Appearance
|
Form Factor (RU) |
3U |
|
Size (Height x Width x Depth) |
132.3 mm x 482 mm x 656.5 mm |
|
Weight |
17.4 kg |
|
Rack Installation Support* |
4-post 19" rack (Synology Rail Kit - RKS-02) |
|
Notes |
The rail kit is sold separately |
|
Others
|
System Fan |
80 mm x 80 mm x 3 pcs |
|
Fan Speed Mode |
- Full-Speed Mode
- Cool Mode
- Quiet Mode
|
|
Easy Replacement System Fan |
✓
|
|
Power Recovery |
✓
|
|
Noise Level* |
44.7 dB(A) |
|
Scheduled Power On / Off |
✓
|
|
Wake on LAN / WAN |
✓
|
|
Power Supply Unit / Adapter |
800 W
550 W |
|
Redundant Power Supply |
✓
|
|
AC Input Power Voltage |
100 V to 240 V AC |
|
Power Frequency |
50/60 Hz, Single Phase |
|
Power Consumption |
145.79 W (Access)
62.68 W (HDD Hibernation) |
|
British Thermal Unit |
497.14 BTU/hr (Access)
213.74 BTU/hr (HDD Hibernation) |
|
Notes |
- Power supply specifications may differ based on the hardware revision of the device. For more information, refer to the Product Change Notice.
- 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%
|
|
Temperature
|
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 |
|
Certification
|
- FCC
- CE
- BSMI
- VCCI
- RCM
- EAC
- CCC
- KC
- UL
|
|
Warranty
|
5 Years |
|
Notes |
The warranty period starts from the purchase date as stated on your purchase receipt. (Learn more)
|
|
Environment
|
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-2666-16G
- Expansion Units: RX1217/RX1217RP
- 3.5" SATA HDD: HAT5300
- 2.5" SATA SSD: SAT5210
- M.2 SSD & 10GbE Combo Adapter Card: E10M20-T1
- M.2 SSD Adapter Card: M2D20
- 25GbE Network Interface Card: E25G21-F2
- 10GbE Network Interface Card: E10G21-F2/E10G18-T2/E10G18-T1
- Rail Kit Sliding: RKS-02
- Surveillance Device License Pack
|
|
Notes |
All memory modules will operate at the maximum frequency specified by the CPU manufacturer. |
