No other vendor can match the DS3615xs for sheer capacity as this is the biggest desktop NAS appliance on the planet. The two design flaws we found knock its scores down slightly but it grabs them back with its huge range of features, massive expansion potential and excellent 10GbE performance.

Manufacturer Bio

Founded in 2000, Synology is dedicated to develop high-performance, reliable, versatile, and environmentally-friendly NAS servers. Our goal is to deliver agile and cost-effective solutions, solid customer service, and ultimately to ensure individuals and business the versatility of choices.

Synology Core Values

Synology provides an affordable way to centralize data storage, simplify data backup, share and sync files across different platforms, and access data on-the-go. The “5S” serve as the pillars to Synology's core values which are realized in products, features, and the direction we head.

North & South America
Synology America Corp.

2899 152nd Ave NE,
Redmond, WA 98052.
+1 425 296 3177 - Support
(Hours of operation: 9A-5P, M-F, GMT-8)
+1 425 818 1587 - Other Inquiries


Product Overview

Synology’s DS3615xs hauls desktop NAS appliances into the big business space as this 12-bay box delivers a big hardware package. It’s certified to support the latest 6TB drives from Seagate and WD and so offers a maximum capacity of 72TB.

There’s more on the menu as Synology has incorporated the high-speed Infiniband ports from its enterprise rack appliances into the DS3615xs allowing it to support a pair of 12-bay DX1215 desktop expansion units. With two of these units connected you can push the drive count to 36 and raw storage capacity to 216TB.

It’s not short on processing power either as it uses a dual-core 3.4GHz Intel Core i3-4130 CPU. This is teamed up with a decent 4GB of DDR3 ECC memory which can be boosted to 32GB although you will need to replace the existing pair of 2GB modules to achieve this.

The appliance is 10GbE ready as it has an 8X PCI-Express slot which supports Synologys’ adapters and industry standard models from Emulex and Intel. Installation is easy as we only had to remove two screws and the lid to access the slot.

Using the DSM (Disk Station Manager) web interface, we found storage simple to configure. On first contact it runs through a wizard which offered to download the latest DSM version and create a RAID5 array from our drives.
Synology’s Hybrid RAID (SHR) feature has now been removed so you no longer have the option of creating arrays using drives of different makes and sizes. Nevertheless, data protection options are tops as you also have support for dual-redundant RAID6 arrays.

SSD read and write caching for volumes and iSCSI LUNs is supported although two identical SSDs are required for write caches. If you opt for a read cache, the appliance creates a stripe from them and for a read/write cache, it’ll create a mirror.

Backup features don’t get any better as the DS3615xs supports replication and shared folder synchronization with other Synology appliances. Extensive cloud backup options include ElephantDrive, Symform, HiDrive, Microsoft Azure, Amazon S3 and the latter’s low-cost Glacier service.

Synology’s Data Replicator backup software gets its marching orders to be replaced by the Cloud Station app which synchronizes files from your PCs and mobiles and between two Synology appliances. And then there’s the Cloud Sync app which supports all manner of cloud services including OneDrive, box, Google Drive and Dropbox plus it’s a cinch to set up.


No other vendor can match the DS3615xs for sheer capacity as this is the biggest desktop NAS appliance on the planet. The two design flaws we found knock its scores down slightly but it grabs them back with its huge range of features, massive expansion potential and excellent 10GbE performance.

Product Specs

The Synology DiskStation DS3615xs provides a premium-performance NAS solution for large scale businesses that require an efficient way to centralize data protection, simplify data management, deploy virtualization solutions, and rapidly expand storage capacity with minimal time spent on setup and maintenance. Synology DS3615xs is backed with Synology’s 5-year limited warranty.

Hardware Specifications
CPU Model INTEL Core i3-4130
CPU Frequency Dual Core 3.4 GHz
Floating Point
Hardware Encryption Engine (AES-NI)
System Memory 4 GB DDR3 ECC
Memory Module Pre-installed 2 GB X 2
Total Memory Slots 4
Memory Expandable up to 32 GB (8 GB X 4)
Drive Bay(s) 12
Maximum Drive Bays with Expansion Unit 36
Compatible Drive Type
  • 3.5" SATA(III) / SATA(II) HDD
  • 2.5" SATA(III) / SATA(II) HDD
  • 2.5" SATA(III) / SATA(II) SSD
Maximum Internal Raw Capacity 72 TB (6 TB HDD X 12) (Capacity may vary by RAID types) (SEE ALL SUPPORTED HDD)
Hot Swappable Drive
External Ports
USB 3.0 Port 2
Expansion Port 2
File System
Internal Drives EXT4
External Drives
  • EXT4
  • EXT3
  • FAT
  • NTFS
  • HFS+
Size (Height X Width X Depth) 270 mm X 300 mm X 340 mm
Weight 9.8 kg
RJ-45 1GbE LAN Port 4 (with Link Aggregation / Failover support)
Wake on LAN/WAN
PCIe x8 Slot for Network Card 1 (at x8 mode)
System Fan 120 mm X 120 mm X 2 pcs
Easy Replacement System Fan
Wireless Support (dongle)
Noise Level* 27.4 dB(A)
Power Recovery
Scheduled Power On/Off
Power Supply Unit / Adapter 500W
AC Input Power Voltage 100V to 240V AC
Power Frequency 50/60 HZ, Single Phase
Power Consumption* 88.48W (Access)
43.54W (HDD Hibernation)
Environment Temperature
Operating Temperature 5°C to 35°C (40°F to 95°F)
Storage Temperature -20°C to 60°C (-5°F to 140°F)
Relative Humidity 5% to 95% RH
  • FCC Class B
  • CE Class B
  • BSMI Class B
Warranty 5 Years
  • Power consumption is measured when fully loaded with Western Digital 1TB WD10EFRX hard drive(s).
  • Noise Level Testing Environment: Fully loaded with Seagate 500GB ST9500325AS hard drive(s) in idle; Two G.R.A.S. Type 40AE microphones, each set up at 1 meter away from the Synology NAS front and rear; Background noise: 17.2 dB(A); Temperature: 23.6˚C; Humidity: 58.2%.
  • When upgrading RAM to more than 24GB, the original 4GB RAM modules must be removed.



The DS3615xs provides users with robust scalability up to 36 drives. With 12 HDD trays and support for adding up to two Synology DX12152 expansion units, DS3615xs provides the ability to seamlessly expand up to 216TB3 of raw storage capacity and expand a single volume up to 108TB on the fly. When the storage capacity of DS3615xs nears it limit, expansion is easily accomplished as it supports up to 36 HDDs or SSDs. DS3615xs provides enterprises flexible capacity and balanced performance to meet the needs of varying applications and processes.

10GbE and SATA III 6Gb/s support

In addition to the default 4 Gigabit ports, DS3615xs comes with one PCI Express Gen3 x8 slot, allowing installation of 10GbE Network Interface Cards (NIC) for maximized bandwidth. Coming with native SATA III 6Gb/s support, DS3615xs ensures the optimum data process under heavy system loading.

SSD cache technology

DS3615xs enables the combination of hard drives and read/write-optimized SSD cache, boosting throughput efficiently while minimizing cost per gigabyte. With full SSD cache reading and writing support, DS3615xs offers a significant reduction in I/O latency without crippling your budget. With only a small upfront investment, businesses can benefit from significant server performance enhancement.

5 year warranty

Synology DS3615xs is backed with Synology's 5-year limited warranty. With technical support and hardware replacement service, the five-year warranty maximizes your enterprises' return on investment. For the entire duration, you will enjoy technical support via e-mail and telephone.


DS3615xs delivers up to 2351.23 MB/s throughput in reading and 236,353.92 read IOPS1. DS3615xs is equipped with 4GB RAM and up to 32GB ECC RAM expansion support, so enterprises can guarantee data accuracy as well as superior performance.

Hardware encryption engine enhances file transfer speeds

Encrypting data is essential to a healthy security policy. Equipped with a dedicated hardware encryption engine, DS3615xs is the ideal digital locker for sensitive data; files and folders are encrypted on the fly and transferred without significant performance loss. DS3615xs delivers encrypted data transmission speeds at 2,282.38MB/s.

By Editorial Team


Just added to your wishlist:
My Wishlist
You've just added this product to the cart:
Go to cart page