Synology RackStation RS3621xs+ 12-Bay NAS Enclosure
Enterprise-class RackStation with Intel Xeon D‑1541, 8 GB ECC DDR4 (expandable to 64 GB), built-in 10 GbE, redundant power, and up to 238K IOPS / 5,819 MB/s throughput. Scale to 36 drives with expansion.
Product Overview
Synology RS3621xs+ is a high-performance 12‑bay rackmount NAS built for enterprise workloads. Powered by an Intel Xeon D‑1541 eight-core CPU (2.1 GHz base, 2.7 GHz turbo) and equipped with 8 GB ECC DDR4 (expandable to 64 GB), it delivers remarkable speed and stability. With dual onboard 10 GbE ports, four 1 GbE ports, redundant power supplies, and dual PCIe slots (Gen 3 x8) for optional 10/25 GbE or SSD cache, this system is ideal for virtualization, backup, iSCSI, and large-scale file services. Supports Btrfs snapshot capabilities, file self-healing, SSD caching, and flexible expansion up to 36 bays via RX1217(RP) units.
Key Features
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Intel Xeon D‑1541 eight-core processor with AES‑NI encryption.
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8 GB ECC DDR4 UDIMM pre-installed, expandable to 64 GB across four slots.
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Dual 10 GbE and quadruple 1 GbE LAN ports with link aggregation & redundancy.
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Twelve hot-swappable 3.5″/2.5″ SATA drive bays; scalable to 36 with two RX1217(RP) expansion units.
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Two PCIe Gen3 x8 expansion slots available for SSD cache cards or high-speed NIC.
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High-performance: up to ~238K 4K IOPS and ~5,819 MB/s sequential read throughput.
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Data protection with Btrfs snapshots, file self-healing, Synology High Availability clustering support.
Specs
| Specification | Details |
|---|---|
| CPU | Intel Xeon D‑1541, 8-core 2.1 GHz (turbo to 2.7 GHz) |
| Memory | 8 GB ECC DDR4 UDIMM (1×8 GB), 4 DIMM slots, max 64 GB |
| Drive Bays | 12 × 3.5″ or 2.5″ SATA HDD/SSD, hot-swappable |
| Max Scalable Bays | Up to 36 with two RX1217(RP) expansion units |
| Network Ports | 2 × 10 GbE RJ‑45, 4 × 1 GbE RJ‑45 (aggregation/failover enabled) |
| PCIe Expansion | 2 × Gen3 ×8 slots (operating at full x8 link) |
| USB / Expansion Ports | 2 × USB 3.2 Gen 1, 2 × Expansion (Infiniband interfaces) |
| RAID Supported | SHR, RAID 0/1/5/6/10, RAID F1, JBOD, Basic |
| File Systems | Btrfs, EXT4 internal; Btrfs, EXT4/3, FAT, NTFS, HFS+, exFAT external |
| PSU | Dual 500 W redundant power supplies |
| Cooling & Fans | 4 × 80 mm fans with variable speed modes |
| Noise Level | ~50 dB(A) operating noise |
| Power Usage | ~142.5 W (access); ~72.8 W (HDD hibernation) |
| Dimensions & Weight | 88 × 482 × 724 mm; ~14.5 kg |
| Warranty | 5‑year standard hardware warranty |
Why Choose This Product
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Enterprise-grade performance and high IOPS throughput meet demanding virtualization, database, and backup needs.
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Dual 10 GbE and redundant power architecture ensure uptime and network resilience.
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Expandable storage to 36 bays, plus PCIe flexibility for NICs or SSD caching, supports future growth.
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Robust data protection via ECC memory, Btrfs snapshot/repair, and HA clustering.
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Ideal for businesses desiring centralized iSCSI, virtualization storage, multi-site failover, or surveillance with Synology Surveillance Station.
FAQs
Q1: How much memory does it support?
Supports up to 64 GB ECC DDR4 across four DIMM slots (one slot pre-populated with 8 GB).
Q2: Can it operate in high-availability mode?
Yes—compatible with Synology High Availability (SHA) for paired active/passive clustered operation.
Q3: What is the drive bay expansion capability?
Supports expansion via two RX1217(RP) units, scaling the internal bay count from 12 to 36.
Q4: Does it support NVMe cache or storage?
PCIe slots support Synology M.2 NVMe adapter cards (e.g. M2D20), but NVMe use is limited to cache functionality only.
5: Are non-Synology drives supported?
RS3621xs+ may restrict functionality (like SMART monitoring) on unofficial drives; best results are with Synology-verified HDDs.
Q6: Is the unit noisy?
Operating noise peaks around 50 dB(A), making it suitable for data center environments; not ideal for quiet office spaces.
