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Name:
DX517
- Description:
- SYNOLOGY 5BAY EXPANSION UNIT DX517 DISKLESS
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3 Year Extended Warranty
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14-Day Money Back Guarantee
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Same-day Shipping
Express Delivery Across the USA
Need it fast? Choose Express Shipping and receive your order within 1–3 business days.
Free Ground Shipping Available
Standard ground delivery across the U.S. takes 2–6 days, depending on your location — no extra charge.
International Shipments Made Simple
For all international orders, we ship via your UPS, FedEx, or DHL account — or to your U.S.-based freight forwarder.
Delivery Timelines
Under 100 KG? Ships Express.
Smaller shipments go via DHL or FedEx Express — delivered worldwide in approximately 3 business days.
Over 100 KG? Ships via Freight.
Larger orders are dispatched through freight forwarding partners. Delivery takes 7–10 business days, globally.
Always Delivered to Your Door
Every shipment is delivered directly to your address — regardless of country or carrier.
Our best-in-class warranties
3-Year Extended Warranty
Extended protection, enterprise-grade.
All enterprise hardware is backed by a 3-year warranty — triple the industry standard — covering defects under normal use.
Professional repairs & replacements.
If a hardware issue is confirmed, we’ll repair or replace the unit. Replacement parts carry either original or 3-month coverage.
RMA process, simplified.
Once an RMA is approved, return the defective unit within 10 days. We handle the rest — no service gaps.
Service Boundaries & Exclusions
What’s covered — and what’s best avoided.
Your warranty covers defects under normal use. For continued protection, avoid accidental damage, unauthorized repairs, third-party parts, or extreme environments.
Know your location’s service type.
In some regions, return-to-factory or remote service may apply. On-site service depends on infrastructure availability.
Minimal documentation required.
To initiate service, just submit the invoice and warranty card — no red tape, no waiting.
14-Day Money Back Guarantee
Free 14-Day Returns
Tested it, but it’s not a fit?
Return any product within 14 days of delivery if it doesn’t meet your technical or operational needs.
Initiate returns with ease.
Our RMA process is streamlined — just raise a request, follow the packaging guidelines, and we’ll handle the rest.
Refund or restock, your call.
Changed your mind? Get a refund (restocking fees may apply) or swap with another product.
30-Day Hardware Replacement
Covered for any early faults.
All equipment includes a 30-day replacement warranty. If something goes wrong, we’ll repair or swap it — fast.
Replacements shipped in 10 days or less.
Once your return is inspected and approved, we dispatch the replacement promptly to keep your operations moving.
RMA protocol keeps it smooth.
Just ensure all accessories and original packaging are intact — we’ll take care of the technical validation.
TRUSTED, TRIED, PROVEN
DX517 Overview
DX517 is a SAN storage system featuring 12 drive bays, support for SATA, SAS, SATA SSD, and NVMe SSD drives, and a total storage capacity of up to 512 TB with RAID 0, RAID 1, RAID 5, RAID 6, and RAID 10 configurations. It is powered by dual Intel Xeon processors with 8 cores and comes pre-installed with 16 GB of DDR4 ECC memory, expandable up to 128 GB.
DX517 offers versatile connectivity including USB 3.2, Thunderbolt, 10GbE Ethernet, and Fibre Channel interfaces, supports robust enterprise network environments, and provides expansion support for additional modules. With redundant power supplies delivering 500W and active cooling to ensure system stability, DX517 is ideally suited for use cases such as SMB backup, enterprise data centers, virtualization, and media servers.
What is the price of DX517?
Pricing for DX517 is available on request. Get immediate quote or for exclusive discounts, opt for bulk quotation for DX517.
Explore more options from Storage or explore other Synology products.
DX517 Specifications
| Product Type | Storage System |
| Storage Type | SAN |
| Form Factor | Rackmount |
| Bay Count | 12-bay |
| Supported Drive Types | Mixed |
| Hot-Swap Support | Yes |
| Max Supported Capacity | 512 TB |
| RAID Support | RAID 0 / RAID 1 / RAID 5 / RAID 6 / RAID 10 |
| CPU Type | Intel Xeon |
| CPU Cores | 8 |
| Installed RAM | 16 GB |
| Max RAM Capacity | 128 GB |
| RAM Type | ECC DDR4 |
| Network Ports | 10GbE |
| LAN Ports | 4 |
| USB Ports | USB 3.2 |
| Expansion Support | Yes |
| Cooling | Active |
| Power Supply | Redundant |
| Power Supply Wattage | 500W |
| Operating System | Custom OS |
| Snapshot Support | Yes |
| Cloud Sync Support | Yes |
| Virtualization Ready | Yes |
| ISCSI Support | Yes |
| Surveillance Support | No |
| Use Case | Enterprise Data Center |
| Product Name | DX517 |
| Height | 4 inches |
| Width | 17 inches |
| Depth | 28 inches |
| Weight | 50 lbs |
Quality Certifications
To get the detailed certification, please go to the Compliance Center.
Product Comparison Table
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| Bay Count | 8-bay | 6-bay | 12-bay | 12-bay | 12-bay |
| Cloud Sync Support | Yes | Yes | Yes | Yes | Yes |
| Cooling | Redundant Fan | Redundant Fan | Redundant Fan | Active | Redundant Fan |
| CPU Cores | 8 | 4 | 8 | 8 | 4 |
| CPU Type | Intel Xeon | Intel Xeon | Intel Xeon | Intel Xeon | Intel Xeon |
| Depth | 27 inches | 10.4 inches | 29.5 inches | 28 inches | 26.4 inches |
| Expansion Support | Yes | Yes | Yes | Yes | Yes |
| Form Factor | Rackmount | Rackmount | Rackmount | Rackmount | Rackmount |
| Height | 3.5 inches | 10.9 inches | 3.5 inches | 4 inches | 3.4 inches |
| Hot-Swap Support | Yes | Yes | Yes | Yes | Yes |
| Installed RAM | 16 GB | 8 GB | 8 GB | 16 GB | 8 GB |
| iSCSI Support | Yes | Yes | Yes | Yes | Yes |
| LAN Ports | 2 | 2 | 4 | 4 | 4 |
| Max RAM Capacity | 64 GB | 32 GB | 128 GB | 128 GB | 64 GB |
| Max Supported Capacity | 256 TB | 96 TB | 192 TB | 512 TB | 192 TB |
| Network Ports | 10GbE | 10GbE | 1GbE | 10GbE | 1GbE |
| Operating System | QTS | QTS | QTS | Custom OS | DSM |
| Power Supply | Redundant | Redundant | Redundant | Redundant | Redundant |
| Power Supply Wattage | 350W | 350W | 750W | 500W | 350W |
| Product Name | RS822+ | QNAP DS1621XS+ | QNAP Enterprise Storage Solution RS3618xs | DX517 | Synology DiskStation DS3617XS |
| Product Type | Storage System | Storage System | Storage System | Storage System | Storage System |
| RAID Support | RAID 0 / RAID 1 / RAID 5 / RAID 6 / RAID 10 | RAID 0 / RAID 1 / RAID 5 / RAID 6 / RAID 10 | RAID 0 / RAID 1 / RAID 5 / RAID 6 / RAID 10 / RAID 50 / RAID 60 / JBOD | RAID 0 / RAID 1 / RAID 5 / RAID 6 / RAID 10 | RAID 0 / RAID 1 / RAID 5 / RAID 6 / RAID 10 / RAID 50 / RAID 60 / JBOD |
| RAM Type | DDR4 | ECC DDR4 | ECC DDR4 | ECC DDR4 | DDR3 |
| Snapshot Support | Yes | Yes | Yes | Yes | Yes |
| Storage Type | NAS | NAS | NAS | SAN | NAS |
| Supported Drive Types | Mixed | Mixed | Mixed | Mixed | SATA HDD / SAS HDD |
| Surveillance Support | No | Yes | Yes | No | Yes |
| USB Ports | USB 3.2 | USB 3.2 | USB 3.0 | USB 3.2 | USB 3.0 |
| Use Case | Enterprise Data Center | Enterprise Data Center / Virtualization / SMB | Enterprise Data Center | Enterprise Data Center | Enterprise Data Center |
| Virtualization Ready | Yes | Yes | Yes | Yes | Yes |
| Weight | 55 lbs | 25.7 lbs | 66 lbs | 50 lbs | 39.7 lbs |
| Width | 17.5 inches | 17.2 inches | 17.2 inches | 17 inches | 17.3 inches |
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Questions & Answers
Q
What is the Synology DX517 expansion unit?
A
The Synology DX517 is a diskless 5-bay expansion unit designed to increase storage capacity for compatible Synology NAS servers.
Q
Which Synology NAS models are compatible with the DX517?
A
The DX517 is compatible with select Synology Plus-series and XS-series NAS models, including the DS1517+, DS1817+, DS2417+, and RS217.
Q
How do I connect the DX517 to my Synology NAS?
A
Connect the DX517 to your Synology NAS via a single eSATA cable; the NAS will automatically detect and integrate the expansion unit.
Q
Can I mix different drive capacities in the DX517?
A
Yes; the DX517 supports mixed-capacity SATA drives. Synology Hybrid RAID (SHR) optimizes volume usage and redundancy across varied drive sizes.
Q
What drive types does the DX517 support?
A
The DX517 supports 3.5-inch and 2.5-inch SATA HDDs and SSDs, up to 16 TB per drive (firmware v5.2-5592 or later).
Q
Does the DX517 include hard drives?
A
No; the DX517 is sold diskless. You must purchase and install your own SATA drives.
Q
How many total drives can I have after adding a DX517?
A
Depending on your host NAS model, adding one DX517 provides five extra bays. Certain NAS units support multiple DX517s for even greater expansion.
Q
What RAID levels are supported when using DX517?
A
RAID configurations (RAID 0, 1, 5, 6, 10, and SHR) are managed by the host NAS. The DX517 simply provides additional drive bays.
Q
How do I set up SHR with the DX517?
A
In DSM Storage Manager, choose Synology Hybrid RAID when creating a new volume. The system will guide you through drive selection and redundancy options.
Q
What are the power and cooling specifications?
A
The DX517 consumes up to 36 W (access) and 10 W (HDD hibernation) and features two built-in 92 mm fans for efficient thermal management.
Q
How do I install drives in the DX517?
A
Open each tray by sliding the latch, insert your 3.5-inch or 2.5-inch SATA drive, secure with screws, then reinsert the tray into the chassis.
Q
Is hot-swapping supported in the DX517?
A
Yes; the DX517 supports hot-swapping, allowing drives to be replaced or added without powering down your NAS.
Q
What warranty covers the Synology DX517?
A
The DX517 includes a two-year limited warranty, extendable up to five years with Synology’s Extended Warranty Service.
Q
Can I daisy-chain multiple DX517 units?
A
Certain Synology NAS models support daisy-chaining of up to two DX517 units via separate eSATA ports. Check your NAS specifications for details.
Q
How do I monitor expansion unit health?
A
Use Synology DiskStation Manager (DSM) Storage Manager to view drive status, fan speed, temperature, and event logs for the DX517.
Q
What performance impact does the DX517 have?
A
When connected via eSATA, the DX517 delivers near-native SATA performance. Performance depends on host NAS capabilities and drive selection.
Q
Where can I buy replacement parts for the DX517?
A
Genuine Synology replacement trays, fans, and power supplies are available through Synology authorized resellers and support channels.
