Expansion Unit RX1222sas
Plug-and-play capacity expansion for Synology servers
Overview:
Accommodate massive storage growth
Expand your Synology rackmount SAS storage 12 bays at a time, for up to 84 additional 3.5"/2.5" SAS/SATA drives with a maximum of seven Synology RX1222sas expansion units.
- Intuitive Installation
Add up to 12 additional 3.5"/2.5" SAS/SATA drives in a 2U enclosure with minimal setup and disruption - Simple Configuration
Start creating new volumes within minutes thanks to Synology DSM’s unified tools - Ready for Synology Drives
Achieve unmatched integration and reliability with Synology SATA and SAS drives - Long-Term Support
Backed by Synology’s 5-year limited warranty
Features:
Easy setup and management
Connect the RX1222sas through the included expansion cable and start managing the additional storage in minutes with Storage Manager and other intuitive tools in Synology DSM. Online volume expansion enables you to add a new volume or expand RAID volumes without reformatting drives.


Built with service uptime in mind
RX1222sas’s hot-swappable drive trays, fans, and power supplies reduce the impact of maintenance on service availability, while the redundant power supply units keep your system online even in case one power source fails.
Achieve More With Synology Drives
Backed by rigorous testing and designed to provide unmatched performance and reliability when paired with Synology hardware, Synology HAT5300 SATA HDDs, HAS5300 SAS HDDs, and SAT5200 SATA SSDs are the ideal choice to build a highly integrated storage setup.
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Technical Specifications:
Hardware Specifications: | |
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Applied Models |
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Storage | |
Drive Bay(s) | 12 |
Compatible Drive Type |
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Hot Swappable Drive | |
RAID Management through Synology DSM | |
External Ports | |
SAS IN-port | 1 |
SAS OUT-port | 1 |
Appearance | |
Size (Height X Width X Depth) | 88 mm x 430.5 mm x 692 mm |
Size (Height X Width X Depth) (with server ears) | 88 mm x 482 mm x 724 mm |
Weight | 13.5 kg |
Rack Installation Support | 4-post 19" rack (Synology Rail Kit - RKS-02) |
Notes | The rail kit is sold separately |
Power | |
Power Recovery | Synchronized with the Synology DiskStation |
Power Supply Unit / Adapter | 500W |
AC Input Power Voltage | 100V to 240V AC |
Power Frequency | 50/60 Hz, Single Phase |
Power Consumption* |
194.4 W (Access) 82.56 W (HDD Hibernation) |
British Thermal Unit |
663.48 BTU/hr (Access) 281.77 BTU/hr (HDD Hibernation) |
Note | Power consumption is measured when it is fully loaded with Western Digital 1TB WD10EFRX hard drive(s). |
Redundant Power Supply | |
Notes | Power consumption is measured when it is fully loaded with Synology HAS5300-8T hard drive(s). |
Temperature | |
Operating Temperature | 5°C to 40°C (40°F to 104°F) |
Storage Temperature | -10°C to 70°C (-15°F to 155°F) |
Relative Humidity | 5% to 95% RH |
Others | |
System Fan | 80 mm x 80 mm x 4 pcs |
Easy Replacement System Fan | |
Noise Level | 54.5 dB(A) |
Note | Noise Level Testing Environment: Fully loaded with Synology SAT5200-480G SSD in the idle state. Two G.R.A.S. Type 40AE microphones, each set up 1 meter away from the Synology NAS at the front and rear. Background noise: 16.49-17.51 dB(A); Temperature: 24.25-25.75˚C; Humidity: 58.2-61.8% | Certification |
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Warranty | 5 Years |
Environment & Packaging | |
Environment | RoHS Compliant |
Packaging Content |
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Optional Accessories |
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*Model specifications are subject to change without notice. Please refer to www.synology.com for the latest information.
Documentation:
Download the Synology Expansion Unit RX1222sas Datasheet (PDF).

5-year warranty
At Synology, we are committed to product innovation and quality. Synology guarantees a robust and reliable data management experience with a 5-year limited warranty, providing responsive technical support and hardware replacement services to maximize your return on investment
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- Pricing and product availability subject to change without notice.