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Synology RS4021XS+ RackStation SAN/NAS Storage System - Intel Xeon D-1541 Octa-core 2.10 GHz - 16 Drive Bays - 16 GB RAM - 3U Rack-mountable
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Product Features
Technical Overview
At the core of the RS4021XS+ is an Intel Xeon D-1541 processor with eight cores running at 2.10 GHz, paired with 16 GB of DDR4 SDRAM. This compute foundation handles simultaneous data access and management tasks efficiently, supporting the system's dual role as both SAN and NAS.
Storage connectivity is managed through a Serial ATA controller, with 16 drive bays that accommodate both 2.5-inch and 3.5-inch form factors. The system supports multiple RAID configurations, from basic JBOD to advanced RAID 6 and RAID F1, allowing administrators to balance performance, capacity, and data protection according to workload requirements.
Relevant factors for this section include Number of Hard Drives Supported, Number of Hard Drives Installed, Number of Solid State Drive Supported, Processor Manufacturer. When those points are considered together, they give buyers a clearer picture of how the product is equipped, how it fits into deployment, and what kind of day-to-day role it is meant to support.
Key Product Advantages
The RS4021XS+ combines enterprise hardware with Synology's proven software ecosystem, creating a storage solution that is both powerful and manageable. Its redundant power supplies and extensive protocol support make it suitable for continuous operation in server rooms and data centers.
High-Density Storage
Sixteen drive bays provide substantial capacity in a 3U footprint, maximizing rack space efficiency while supporting both HDD and SSD media for tiered storage strategies.
- 16 total expansion bays
- 2.5"/3.5" compatibility
- HDD and SSD support
Enterprise Networking
Six Gigabit Ethernet ports with 10 Gigabit Ethernet capability deliver high-throughput connectivity for SAN and NAS workloads, reducing network bottlenecks in multi-user environments.
- 6 RJ-45 ports
- 10GbE support
- Multiple protocol compatibility
Reliable Power Design
Dual 800 W power supplies with redundancy ensure continuous operation, while the 3U rack-mountable form factor integrates seamlessly into standard server racks.
- 2 redundant PSUs
- 800 W maximum
- 3U rack height
Deployment / Use Cases
The RS4021XS+ is designed for organizations requiring centralized storage with both file-level and block-level access. Its SAN/NAS capabilities make it versatile for mixed workload environments where performance and reliability are critical.
Typical deployments include virtualized infrastructure storage backends, media production asset repositories, database hosting, and archival systems. The system's protocol support—including iSCSI, NFS, SMB, and FTP—ensures compatibility with diverse client environments, from Windows and Linux servers to multimedia workstations.
Virtualization Storage
Provide iSCSI or NFS storage to hypervisors like VMware ESXi or Microsoft Hyper-V, leveraging the system's 10GbE connectivity for low-latency virtual machine operations.
Media & Creative Workflows
Serve as a high-capacity shared storage repository for video editing teams, with SMB 3.0 support for efficient file sharing across Windows and macOS workstations.
Localization and Operating System
The Synology RS4021XS+ runs DiskStation Manager (DSM), a Linux-based operating system designed specifically for Synology storage systems. DSM provides a comprehensive web-based interface that supports multiple languages and regional settings, making it accessible for administrators across different geographies. The system's protocol support, including SMB, NFS, and iSCSI, ensures compatibility with diverse client environments, from Windows and Linux servers to macOS workstations, without requiring additional localization adjustments.
For deployment in North American markets, the RS4021XS+ is configured with standard English language settings and adheres to common networking and storage protocols used in enterprise environments. Its power supplies are designed for 100-240 V AC input, accommodating typical voltage ranges in data centers worldwide. The absence of region-specific hardware limitations allows for flexible integration into existing IT infrastructures, whether deployed as a centralized storage repository, virtualization backend, or archival system.
DiskStation Manager (DSM)
DSM offers a user-friendly interface with built-in applications for backup, surveillance, virtualization, and collaboration. It includes regular security updates and supports Synology's ecosystem of apps, providing a robust platform for managing storage, users, and data protection tasks without requiring deep Linux expertise.
Physical Profile
The RS4021XS+ occupies three rack units (3U) with dimensions of 5.21 inches in height, 18.98 inches in width, and 25.85 inches in depth. Its rack-mountable design includes standard mounting hardware compatibility, while the 38.36-pound weight reflects its robust construction with dual power supplies and sixteen drive bays.
The physical profile is practical for deployment planning because the dimensions and weight are clearly defined: 5.21" (132.30 mm), 18.98" (482 mm), 25.85" (656.50 mm), 38.36 lb (17400 g). This helps confirm rack, shelf, desk, or cabinet fit before installation.
- Width
- 18.98" (482 mm)
- Depth
- 25.85" (656.50 mm)
- Height
- 5.21" (132.30 mm)
- Weight
- 38.36 lb (17400 g)
Highlights
- Intel Xeon D-1541 octa-core processor at 2.10 GHz for enterprise performance
- 16 GB DDR4 SDRAM standard memory for multitasking and caching
- 16 drive bays supporting both HDD and SSD media in 2.5"/3.5" form factors
- Comprehensive RAID support including RAID 0, 1, 5, 6, 10, JBOD, and RAID F1
- Six Gigabit Ethernet ports with 10 Gigabit Ethernet capability
- Dual redundant 800 W power supplies for continuous operation
- 3U rack-mountable form factor for standard server rack integration
- DiskStation Manager operating system with web-based management
- Extensive protocol support: CIFS, NFS, iSCSI, SMB, FTP, and more
- Two USB 3.2 Gen 1 ports for peripheral connectivity
Specifications
| Specifications | |
|---|---|
| Manufacturer | Synology, Inc |
| Manufacturer Part Number | RS4021XS+ |
| Brand Name | Synology |
| Product Line | RackStation |
| Product Series | XS |
| Product Model | RS4021XS+ |
| Product Name | RackStation RS4021XS+ SAN/NAS Storage System |
| Packaged Quantity | 1 |
| Product Type | SAN/NAS Storage System |
| Storage | |
| Number of Hard Drives Supported | 16 |
| Number of Hard Drives Installed | 0 |
| Number of Solid State Drive Supported | 16 |
| Number of Solid State Drive Installed | 0 |
| Processor & Chipset | |
| Processor Manufacturer | Intel |
| Processor Type | Xeon |
| Processor Model | D-1541 |
| Processor Core | Octa-core (8 Core) |
| Processor Speed | 2.10 GHz |
| Memory | |
| Standard Memory | 16 GB |
| Memory Technology | DDR4 SDRAM |
| Network & Communication | |
| Ethernet Technology | Gigabit Ethernet,10 Gigabit Ethernet |
| I/O Expansions | |
| Number of Total Expansion Bays | 16 |
| Number of 2.5"/3.5" Bays | 16 |
| Controllers | |
| Controller Type | Serial ATA |
| RAID Supported | Yes |
| RAID Levels | 0, 1, 5, 6, 10, Basic, JBOD, RAID F1 |
| Interfaces/Ports | |
| Total Number of USB Ports | 2 |
| Number of USB 3.2 Gen 1 Ports | 2 |
| Network (RJ-45) | Yes |
| Number of Network (RJ-45) Ports | 6 |
| Software | |
| Operating System | DiskStation Manager |
| Management & Protocols | |
| Protocols | CIFS,AFP,NFS,FTP,WEBDAV,SMB 1.0,SMB 2.0,SMB 3.0,NFSv3,NFSv4,NFSv4.1,iSCSI,HTTP,HTTPS,SNMP,LDAP,CalDAV,DLNA |
| Power Description | |
| Number of Power Supplies Installed | 2 |
| Maximum Power Supply Wattage | 800 W |
| Redundant Power Supply | Yes |
| Physical Characteristics | |
| Height | 5.21" (132.30 mm) |
| Width | 18.98" (482 mm) |
| Depth | 25.85" (656.50 mm) |
| Form Factor | Rack-mountable |
| Rack Height | 3U |
| Weight (Approximate) | 38.36 lb (17400 g) |
| Miscellaneous | |
| Country of Origin | Taiwan |
FAQ
What processor does this product use?
This product uses the Intel processor for everyday performance and multitasking.
How much memory is installed?
It includes 16 GB of memory to support responsive multitasking and daily workloads.
What storage is included?
The system includes 0 of storage for applications, files, and everyday business data.
What graphics or display support is listed?
Display-related specifications help position Synology RackStation RS4021XS+ SAN/NAS Storage System - Intel Xeon D-1541 Octa-core (8 Core) 2.10 GHz - 16 x HDD Supported - 0 x HDD - (RS4021XS+) for the kind of viewing experience, readability, and workspace fit buyers may expect in business it/storage arrays & nas/nas storage system deployments.
What connectivity options are available?
Connectivity options include Gigabit Ethernet,10 Gigabit Ethernet, helping the product integrate into common office or home setups.
What operating system or platform is included?
The included operating environment is DiskStation Manager, which helps position the product for software compatibility, deployment planning, and day-to-day business use.
| Qty | Price | Available |
|---|
