Synology RS4021XS+ 16-Bay RackStation (Diskless)

The Synology RackStation RS4021xs+ is a 16-bay 3U rackmount NAS built for enterprise environments that require high-capacity storage, strong throughput, and room to grow. Powered by an 8-core Intel processor with memory upgradable to 64GB, it delivers up to 234,698 random read IOPS and 6,258 MB/s sequential read performance — capable of serving as the central storage backbone for virtualization clusters, large-scale surveillance deployments, corporate file sharing, and database applications. Dual PCIe expansion slots accommodate M.2 NVMe SSD cache adapters for accelerating hot data access, or additional 10GbE and 25GbE network interface cards for expanded connectivity.

The RS4021xs+ is designed for environments where downtime is not an option. Dual redundant hot-swappable power supplies provide fault tolerance at the power level, while the system's support for multiple RAID configurations and Synology's snapshot and replication tools protect data at the storage level. When the initial 16 bays approach capacity, two RX1217 or RX1217RP expansion units can be attached to bring the total to 40 drive bays — all managed seamlessly through DiskStation Manager. DSM provides built-in tools for backup, file services, monitoring, and storage analytics, creating a self-contained storage platform that scales with business needs. Synology's 5-year warranty underscores the RS4021xs+ as a long-term infrastructure investment for organizations with demanding, growth-oriented data requirements.