Synology

Synology RS3618xs 12-Bay NAS RackStation Diskless

4.0 (47 reviews)

Enterprise-grade 12-bay rackmount NAS delivering over 3,900 MB/s reads and scaling to 36 drives.

$2,599.99*
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*Price sourced from Amazon.com. Last updated:Jul 14, 2026.Price and availability are subject to change.

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Overview

The Synology RackStation RS3618xs is a 12-bay rackmount NAS engineered for enterprise storage demands. At its core is a quad-core processor with hardware AES-NI encryption acceleration, paired with 8GB of DDR4 ECC UDIMM that can be expanded to 64GB for virtualization and memory-intensive workloads. The unit delivers over 3,900 MB/s in sequential reads and 143,500 iSCSI random read IOPS, making it well suited for large-scale file serving, surveillance recording, database hosting, and virtual machine storage. When 12 bays are not enough, adding Synology RX1217 or RX1217RP expansion units scales total capacity to 36 drives.

On the software side, Synology's DiskStation Manager provides a complete virtualization solution through Virtual Machine Manager, while dynamic iSCSI and NFS storage integration supports VMware, Windows Hyper-V, Citrix, and OpenStack environments. Optional 10GbE and 40GbE network interface cards let administrators eliminate network bottlenecks and fully leverage the RS3618xs's throughput. Sold diskless, the RS3618xs gives IT teams the freedom to select drives that match their specific capacity, performance, and redundancy requirements — a flexibility that enterprise buyers expect from a platform of this caliber.

Key Features

Quad-core CPU with AES-NI and 8GB (up to 64GB) DDR4 ECC UDIMM; Scalable up to 36 drives with Synology RX1217/RX1217RP

Ultra-high performance of over 3,900 MB/s sequential reading and 143,500 iSCSI random read IOPS, capable of installing optional 10GbE/40GbE NICs

Complete virtualization solution with Synology Virtual Machine Manager

Dynamic iSCSI/NFS storage for VMware, Windows Hyper-V, Citrix, and OpenStack

Specifications

Brand
Synology
Model
RS3618xs
Form Factor
2U Rackmount
Drive Bays
12 (scalable to 36 with RX1217/RX1217RP)
Processor
Quad-core with AES-NI
Memory
8GB DDR4 ECC UDIMM (expandable to 64GB)
Sequential Read
Over 3,900 MB/s
iSCSI Random Read IOPS
143,500
Optional Networking
10GbE / 40GbE NIC support
Virtualization
Synology VMM, VMware, Hyper-V, Citrix, OpenStack
Included Drives
None (diskless)

Pros & Cons

👍 Pros

  • Scales from 12 to 36 drives with RX1217/RX1217RP expansion units for substantial storage growth
  • Over 3,900 MB/s sequential read and 143,500 iSCSI random read IOPS deliver enterprise-class throughput
  • ECC memory (expandable to 64GB) protects data integrity during memory-intensive operations
  • Built-in virtualization via Synology Virtual Machine Manager plus support for VMware, Hyper-V, Citrix, and OpenStack

👎 Cons

  • Sold diskless, requiring a separate and potentially significant investment in enterprise drives
  • Base 8GB RAM configuration may need immediate upgrading for virtualization-heavy deployments
  • Rackmount 2U form factor requires a standard server rack and proper ventilation environment
  • Optional 10GbE/40GbE NICs are sold separately, adding cost to reach the unit's full throughput potential
  • Higher acquisition cost positions this firmly as an enterprise product rather than a small-office solution

Frequently Asked Questions

The RS3618xs starts with 12 bays and scales to 36 drives when paired with Synology RX1217 or RX1217RP expansion units, significantly increasing raw storage capacity.
Yes. The unit accepts optional 10GbE and 40GbE network interface cards, allowing you to match network throughput to the NAS's high sequential read performance.
The RS3618xs supports VMware, Windows Hyper-V, Citrix, and OpenStack through dynamic iSCSI and NFS storage, and it also includes Synology Virtual Machine Manager for running VMs directly on the NAS.
No. The RS3618xs is sold diskless, so you choose and install your own 3.5-inch or 2.5-inch SATA drives to match your capacity and performance requirements.
It ships with 8GB of DDR4 ECC UDIMM and can be expanded up to 64GB, which is beneficial for heavy virtualization or large-scale file serving workloads.