Synology DX1215ii 12-Bay Diskless NAS Expansion Unit
The DX1215II 12-Bay Expansion Unit from Synology allows for maximum storage scalability while taking up minimal space on your desktop. The DX1215II provides an additional 12 drive bays that support SATA 3.5" hard drives, as well as 2.5" hard drives and solid-state drives. To connect to a supported Synology NAS, the DX1215II uses a secure and specially designed expansion cable that connects to its InfiniBand port. This helps to ensure not only a simple connection, but maximum data throughput. It operates on 100 - 240 VAC at 50 to 60 Hz, single phase. Included with this unit is an accessory pack, an AC power cord, and an InfiniBand expansion cable.
The DX1215II 12-Bay Expansion Unit from Synology allows for maximum storage scalability while taking up minimal space on your desktop. The DX1215II provides an additional 12 drive bays that support SATA 3.5" hard drives, as well as 2.5" hard drives and solid-state drives. To connect to a supported Synology NAS, the DX1215II uses a secure and specially designed expansion cable that connects to its InfiniBand port. This helps to ensure not only a simple connection, but maximum data throughput. It operates on 100 - 240 VAC at 50 to 60 Hz, single phase. Included with this unit is an accessory pack, an AC power cord, and an InfiniBand expansion cable.
The DX1215II 12-Bay Expansion Unit from Synology allows for maximum storage scalability while taking up minimal space on your desktop. The DX1215II provides an additional 12 drive bays that support SATA 3.5" hard drives, as well as 2.5" hard drives and solid-state drives. To connect to a supported Synology NAS, the DX1215II uses a secure and specially designed expansion cable that connects to its InfiniBand port. This helps to ensure not only a simple connection, but maximum data throughput. It operates on 100 - 240 VAC at 50 to 60 Hz, single phase. Included with this unit is an accessory pack, an AC power cord, and an InfiniBand expansion cable.
The DX1215II 12-Bay Expansion Unit from Synology allows for maximum storage scalability while taking up minimal space on your desktop. The DX1215II provides an additional 12 drive bays that support SATA 3.5" hard drives, as well as 2.5" hard drives and solid-state drives. To connect to a supported Synology NAS, the DX1215II uses a secure and specially designed expansion cable that connects to its InfiniBand port. This helps to ensure not only a simple connection, but maximum data throughput. It operates on 100 - 240 VAC at 50 to 60 Hz, single phase. Included with this unit is an accessory pack, an AC power cord, and an InfiniBand expansion cable.
in 7 offers
The lowest price for Synology DX1215ii 12-Bay Diskless NAS Expansion Unit right now is $1,999.00 at JW Computers, compared across 7 retailers.
The all-time low was $1,522.21 on 11 May 2026 — today's price is 31% above the lowest ever. It has been notably cheaper before — worth setting a price alert.
Prices last updated 18 July 2026.
Last updated at 18/07/2026 22:23:08
Synology Expansion Unit DX1215ii 12-Bay 3.5" Diskless NAS for Scalable Models (SMB/ENT)
Free delivery
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Synology DX1215ii Expansion 12-Bay 2.5"/3.5" SATA Expansion Unit
Delivery between Tue – Fri $36
Synology DX1215II 12 Bay Expansion Unit
30-day returns
Synology Expansion Unit 12 Bay 3.5" Diskless NAS for Scalable SMB/ENT Models (DX1215ii)
30-day returns
Synology DX1215ii 12-bay Expansion Unit for Scalable Models
Synology DX1215II 12-Bay Diskless NAS Expansion Unit
Synology DX1215ii 12-Bay Expansion Unit
Delivery by Fri $40
originally posted on scan.co.uk
Device is easy to setup, literally plug and play. Comes with the required cable to connect to the main unit. Once powered up appears in Storage Manager as additional 12 bays and works as exactly as expected. Was pleasantly surprised that adding the expansion unit didn't appear to increase the noise levels, despite doubling the number of fans.
originally posted on bhphotovideo.com
I got one of these to add to my DS2419+ and it has worked flawlessly. It's a good way to expand capacity at a much lower cost than an additional NAS. Plus I can manage it all from one spot rather than needing to log into two separate NAS units. The only downside is that if the main unit breaks, I have no choice but to fix it because I need it to operate this expansion unit. But I'm okay with that risk.
originally posted on bhphotovideo.com
I have been using Synology DS3617xs NAS Server for more than 3 years and wanted to expand the volume. Synology DX1215II is the most energy efficient and one of the most easiest expansion unit I have handled thus far. It's a simple plug and play; and you can manage the drives in any RAID configuration in the DSM.Plus, I think it's the cheap 12 bay expansion unit i the market.Also, works like a charm with any Seagate HDD - Exos, Ironwolf.
| General | |
| Device Type | Hard drive array |
| Chassis | |
| Installed Devices / Modules Qty | 12 |
| Supported Devices / Modules Qty | 12 |
Synology Expansion Unit DX1215ii 12-Bay 3.5" Diskless NAS for Scalable Models (SMB/ENT)
Free delivery
Affiliate Disclosure: We may receive a small commission for purchases made through this link at no extra cost to you. This helps support our site. Thank you!
Synology DX1215ii Expansion 12-Bay 2.5"/3.5" SATA Expansion Unit
Delivery between Tue – Fri $36
Synology DX1215II 12 Bay Expansion Unit
30-day returns
Synology Expansion Unit 12 Bay 3.5" Diskless NAS for Scalable SMB/ENT Models (DX1215ii)
30-day returns
Synology DX1215ii 12-bay Expansion Unit for Scalable Models
Device is easy to setup, literally plug and play. Comes with the required cable to connect to the main unit. Once powered up appears in Storage Manager as additional 12 bays and works as exactly as expected. Was pleasantly surprised that adding the expansion unit didn't appear to increase the noise levels, despite doubling the number of fans.
I got one of these to add to my DS2419+ and it has worked flawlessly. It's a good way to expand capacity at a much lower cost than an additional NAS. Plus I can manage it all from one spot rather than needing to log into two separate NAS units. The only downside is that if the main unit breaks, I have no choice but to fix it because I need it to operate this expansion unit. But I'm okay with that risk.
I have been using Synology DS3617xs NAS Server for more than 3 years and wanted to expand the volume. Synology DX1215II is the most energy efficient and one of the most easiest expansion unit I have handled thus far. It's a simple plug and play; and you can manage the drives in any RAID configuration in the DSM.Plus, I think it's the cheap 12 bay expansion unit i the market.Also, works like a charm with any Seagate HDD - Exos, Ironwolf.
very happy with the Syno
| General | |
| Device Type | Hard drive array |
| Chassis | |
| Installed Devices / Modules Qty | 12 |
| Supported Devices / Modules Qty | 12 |
