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RS4021XS+
SYNOLOGY 16BAY RACKSTATION RS4021XS+ DISKLESS
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$5,000,000+
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RS4021XS+ is a high-performance SAN storage system engineered for enterprise data centers and SMB backup environments. It features a 24‐bay configuration that supports a mixed array of drive types including SATA HDDs, SAS HDDs, SATA SSDs, and NVMe SSDs, offering a total storage capacity of up to 512 TB. The system supports multiple RAID configurations such as RAID 0, RAID 1, RAID 5, RAID 6, and RAID 10, ensuring reliable data protection and performance under heavy workloads.
RS4021XS+ is powered by an Intel Xeon processor with 8 CPU cores and comes with 16 GB of pre-installed DDR4 memory, expandable to a maximum of 128 GB. It provides versatile connectivity through USB 3.2 ports, 10GbE network ports, and Fibre Channel support, while offering expansion capabilities for future upgrades. The system is equipped with redundant power supplies rated at 500W and redundant fan cooling, making it ideal for use cases such as SMB backup, enterprise data centers, virtualization, and media server deployments.
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| RS4021XS+ |  RS822RP+ |  FS3400 |  DS418 |  DS220J | |
|---|---|---|---|---|---|
| Product Type | Storage System | Storage System | Storage System | Storage System | Storage System |
| Storage Type | SAN | NAS | NAS | NAS | NAS |
| Form Factor | Rackmount | Rackmount | Rackmount | Desktop | Desktop |
| Bay Count | 24-bay | 12-bay | 4-bay | 4-bay | 2-bay |
| Supported Drive Types | Mixed | Mixed | SATA HDD / SAS HDD / SATA SSD / NVMe SSD | SATA HDD / SATA SSD | SATA HDD / SATA SSD |
| Hot-Swap Support | Yes | Yes | Yes | Yes | No |
| Max Supported Capacity | 512 TB | 512 TB | 256 TB | 64 TB | 32 TB |
| RAID Support | RAID 0 / RAID 1 / RAID 5 / RAID 6 / RAID 10 | RAID 0 / RAID 1 / RAID 5 / RAID 6 / RAID 10 | RAID 0 / RAID 1 / RAID 5 / RAID 6 / RAID 10 | RAID 0 / RAID 1 / RAID 5 / RAID 6 / RAID 10 / JBOD | RAID 0 / RAID 1 / JBOD |
| CPU Type | Intel Xeon | Intel Xeon | Intel Xeon | Realtek | Realtek |
| CPU Cores | 8 | 4 | 8 | 4 | 4 |
| Installed RAM | 16 GB | 8 GB | 16 GB | 2 GB | 512 MB |
| Max RAM Capacity | 128 GB | 32 GB | 64 GB | 2 GB | 512 MB |
| RAM Type | DDR4 | DDR4 | DDR4 | DDR4 | DDR4 |
| Network Ports | 10GbE | 10GbE | 10GbE | 1GbE | 1GbE |
| LAN Ports | 4 | 2 | 2 | 2 | 1 |
| USB Ports | USB 3.2 | USB 3.2 | USB 3.1 | USB 3.0 | USB 3.0 |
| Expansion Support | Yes | Yes | Yes | No | No |
| Cooling | Redundant Fan | Redundant Fan | Active | Active | Active |
| Power Supply | Redundant | Redundant | Redundant | Single | Single |
| Power Supply Wattage | 500W | 350W | 500W | N/A | N/A |
| Operating System | QTS | QTS | Custom OS | DSM | DSM |
| Snapshot Support | Yes | Yes | Yes | Yes | Yes |
| Cloud Sync Support | Yes | Yes | Yes | Yes | Yes |
| Virtualization Ready | Yes | Yes | Yes | Yes | No |
| iSCSI Support | Yes | Yes | Yes | Yes | Yes |
| Surveillance Support | Yes | No | No | Yes | Yes |
| Use Case | Enterprise Data Center | Enterprise Data Center | SMB / Enterprise Data Center / Media Server / Virtualization | SMB / Media Server / Virtualization | Home Backup |
| Product Name | RS4021XS+ | RS822RP+ | FS3400 High-Performance NAS Storage System | Synology DiskStation DS418 | Synology DiskStation DS220j |
| Height | 3.5 inches | 3.5 inches | 3.5 inches | 9.1 inches | 6.5 inches |
| Width | 19 inches | 17.5 inches | 17.5 inches | 6.5 inches | 4.25 inches |
| Depth | 30 inches | 25 inches | 25.0 inches | 8.8 inches | 9.13 inches |
| Weight | 75 lbs | 40 lbs | 30 lbs | 4.5 lbs | 2.5 lbs |
Enterprise-grade 16-bay power. Handles our massive virtualization workloads with incredible speed and complete reliability.
Exceptional throughput and robust build. A critical component for our high-demand enterprise data center infrastructure.
Powerful performance with massive scalability. This RackStation offers the high-end stability our large corporation requires.
Superior reliability for mission-critical apps. The high-speed networking and huge capacity are truly professional grade.
Top-tier server performance. It effectively manages our high-traffic database and massive file storage with ease.
Exceptional 16-bay capacity and speed. Perfect for businesses needing elite-level storage density and performance.
A powerhouse 16-bay RackStation that handles our massive virtualization environment without breaking a sweat. The enterprise-grade performance and reliability are truly top-tier.
Exceptional throughput for our high-demand data center. This unit provides the massive scalability and hardware redundancy necessary for our mission-critical corporate applications.
Robust build quality and incredible speed. It effectively manages our intensive database workloads while providing absolute peace of mind through its high-availability features.
Superior performance for large-scale enterprise storage. The 10GbE connectivity and massive drive capacity make this an essential component of our network infrastructure.
Industry-leading reliability and massive IOPS. This unit has drastically improved our server response times and provides a very stable platform for data growth.
The Synology RS4021xs+ is a high-performance 1U rackmount NAS with 16 drive bays, designed for SMBs and enterprises requiring scalable storage, advanced data management, and seamless virtualization support.
The RS4021xs+ features an Intel Xeon D-1541 8-core 2.1 GHz processor (boost to 2.7 GHz) and comes with 8 GB DDR4 ECC RAM, expandable up to 64 GB for demanding workloads.
With 16 bays supporting up to 18 TB drives, the RS4021xs+ delivers a maximum raw capacity of 288 TB, expandable to 576 TB with one RX1217/RX1217RP expansion unit.
The RS4021xs+ supports 3.5″ and 2.5″ SATA SSDs and HDDs, including hot-swappable drives for uninterrupted operation and flexible tiered storage configurations.
No, the RS4021xs+ is diskless—buyers must install their own compatible 3.5″ or 2.5″ SATA drives to customize capacity and performance.
Synology RS4021xs+ supports RAID 0, 1, 5, 6, 10, 50, and 60, as well as Synology Hybrid RAID (SHR), enabling optimal balance between performance, capacity, and data protection.
Yes, you can connect up to one RX1217 or RX1217RP expansion unit to increase capacity by an additional 12 bays, for a total of 28 drives.
The RS4021xs+ includes four 1 GbE RJ-45 ports, two 10 GbE SFP+ ports, and optional PCIe slots for adding 25 GbE or 40 GbE network cards to meet high-throughput demands.
Equipped with SSD caching and 10 GbE connectivity, the RS4021xs+ delivers over 4,200 MB/s sequential read and 870,000 IOPS, ideal for virtualization and database applications.
Yes, it is certified for VMware vSphere, Microsoft Hyper-V, Citrix XenServer, and OpenStack Cinder, supporting advanced features like VAAI, thin provisioning, and multipath I/O.
Synology RS4021xs+ offers Snapshot Replication, Hyper Backup, and Active Backup Suite, providing block-level snapshots, multi-versioning, and offsite replication for comprehensive data protection.
It runs DiskStation Manager (DSM) 7, a Linux-based NAS operating system featuring a modern web UI, integrated container, and hybrid cloud services.
The RS4021xs+ includes AES-NI hardware encryption, secure boot, TPM 2.0 compatibility, and advanced firewall, malware prevention, and two-factor authentication for enterprise-grade security.
At full load, the RS4021xs+ consumes approximately 180 W (without drives) and 40 W in hibernation mode, featuring dual 550 W redundant power supplies for high availability.
The RS4021xs+ measures 44 mm × 430.5 mm × 566 mm (HxWxD) and weighs 13.8 kg (diskless), fitting standard 1U rack spaces in 19″ server racks.
Synology offers a 5-year limited warranty on the RS4021xs+, with optional Synology Replacement Service (SRS) for next-business-day advance hardware replacement.
United States