
Synology
Synology RS3618xs 12-Bay NAS RackStation Diskless
★★★★★
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
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
How many total drives can the RS3618xs support with expansion units?
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.
Does the RS3618xs support 10GbE or faster networking?
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.
What virtualization platforms are compatible with the RS3618xs?
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.
Does this NAS ship with hard drives installed?
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.
How much RAM can the RS3618xs support?
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.