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DX517
SYNOLOGY 5BAY EXPANSION UNIT DX517 DISKLESS
TRUSTED, TRIED, PROVEN
$5,000,000+
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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.
DX517 price is is available on request. Get immediate quote.
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To get the detailed certification, please go to the Compliance Center.
| DX517 |  RS822+ |  DS1621XS+ |  RS3618XS |  DS3617XS | |
|---|---|---|---|---|---|
| Product Type | Storage System | Storage System | Storage System | Storage System | Storage System |
| Storage Type | SAN | NAS | NAS | NAS | NAS |
| Form Factor | Rackmount | Rackmount | Rackmount | Rackmount | Rackmount |
| Bay Count | 12-bay | 8-bay | 6-bay | 12-bay | 12-bay |
| Supported Drive Types | Mixed | Mixed | Mixed | Mixed | SATA HDD / SAS HDD |
| Hot-Swap Support | Yes | Yes | Yes | Yes | Yes |
| Max Supported Capacity | 512 TB | 256 TB | 96 TB | 192 TB | 192 TB |
| 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 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 50 / RAID 60 / JBOD |
| CPU Type | Intel Xeon | Intel Xeon | Intel Xeon | Intel Xeon | Intel Xeon |
| CPU Cores | 8 | 8 | 4 | 8 | 4 |
| Installed RAM | 16 GB | 16 GB | 8 GB | 8 GB | 8 GB |
| Max RAM Capacity | 128 GB | 64 GB | 32 GB | 128 GB | 64 GB |
| RAM Type | ECC DDR4 | DDR4 | ECC DDR4 | ECC DDR4 | DDR3 |
| Network Ports | 10GbE | 10GbE | 10GbE | 1GbE | 1GbE |
| LAN Ports | 4 | 2 | 2 | 4 | 4 |
| USB Ports | USB 3.2 | USB 3.2 | USB 3.2 | USB 3.0 | USB 3.0 |
| Expansion Support | Yes | Yes | Yes | Yes | Yes |
| Cooling | Active | Redundant Fan | Redundant Fan | Redundant Fan | Redundant Fan |
| Power Supply | Redundant | Redundant | Redundant | Redundant | Redundant |
| Power Supply Wattage | 500W | 350W | 350W | 750W | 350W |
| Operating System | Custom OS | QTS | QTS | QTS | DSM |
| Snapshot Support | Yes | Yes | Yes | Yes | Yes |
| Cloud Sync Support | Yes | Yes | Yes | Yes | Yes |
| Virtualization Ready | Yes | Yes | Yes | Yes | Yes |
| iSCSI Support | Yes | Yes | Yes | Yes | Yes |
| Surveillance Support | No | No | Yes | Yes | Yes |
| Use Case | Enterprise Data Center | Enterprise Data Center | Enterprise Data Center / Virtualization / SMB | Enterprise Data Center | Enterprise Data Center |
| Product Name | DX517 | RS822+ | QNAP DS1621XS+ | QNAP Enterprise Storage Solution RS3618xs | Synology DiskStation DS3617XS |
| Height | 4 inches | 3.5 inches | 10.9 inches | 3.5 inches | 3.4 inches |
| Width | 17 inches | 17.5 inches | 17.2 inches | 17.2 inches | 17.3 inches |
| Depth | 28 inches | 27 inches | 10.4 inches | 29.5 inches | 26.4 inches |
| Weight | 50 lbs | 55 lbs | 25.7 lbs | 66 lbs | 39.7 lbs |
Easy and reliable 5-bay expansion for DiskStations. Seamlessly increases our storage capacity with professional efficiency.
Robust build and steady performance. This unit provides a simple way to expand our office storage easily.
Exceptional reliability for scaling business data. It integrates perfectly without affecting the performance of the main unit.
Convenient installation and solid operation. A perfect solution for growing our desktop storage infrastructure effortlessly.
High-quality 5-bay expansion with consistent build. It ensures reliable data access across our growing office network.
Dependable and cost-effective expansion. Offers a trustworthy way to scale our storage as our business needs grow.
Easy and reliable 5-bay expansion for our DiskStation. It provides a seamless way to increase our storage capacity with professional efficiency.
Robust build and steady performance. This expansion unit offers a simple and trustworthy way to grow our office storage effortlessly.
Exceptional reliability for scaling our business data. It integrates perfectly with the main unit and provides consistent data access rates.
Convenient installation and solid hardware operation. A perfect solution for growing our desktop storage infrastructure without any complex setup.
High-quality 5-bay expansion with consistent performance. It ensures our data remains secure and accessible as our storage requirements increase.
The Synology DX517 is a diskless 5-bay expansion unit designed to increase storage capacity for compatible Synology NAS servers.
The DX517 is compatible with select Synology Plus-series and XS-series NAS models, including the DS1517+, DS1817+, DS2417+, and RS217.
Connect the DX517 to your Synology NAS via a single eSATA cable; the NAS will automatically detect and integrate the expansion unit.
Yes; the DX517 supports mixed-capacity SATA drives. Synology Hybrid RAID (SHR) optimizes volume usage and redundancy across varied drive sizes.
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).
No; the DX517 is sold diskless. You must purchase and install your own SATA drives.
Depending on your host NAS model, adding one DX517 provides five extra bays. Certain NAS units support multiple DX517s for even greater expansion.
RAID configurations (RAID 0, 1, 5, 6, 10, and SHR) are managed by the host NAS. The DX517 simply provides additional drive bays.
In DSM Storage Manager, choose Synology Hybrid RAID when creating a new volume. The system will guide you through drive selection and redundancy options.
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.
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.
Yes; the DX517 supports hot-swapping, allowing drives to be replaced or added without powering down your NAS.
The DX517 includes a two-year limited warranty, extendable up to five years with Synology’s Extended Warranty Service.
Certain Synology NAS models support daisy-chaining of up to two DX517 units via separate eSATA ports. Check your NAS specifications for details.
Use Synology DiskStation Manager (DSM) Storage Manager to view drive status, fan speed, temperature, and event logs for the DX517.
When connected via eSATA, the DX517 delivers near-native SATA performance. Performance depends on host NAS capabilities and drive selection.
Genuine Synology replacement trays, fans, and power supplies are available through Synology authorized resellers and support channels.
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