On-the-fly SAS expansion up to 12 additional bays
RXD1219sas is a 2U expansion unit designed to work automatically when connected, providing an effortless storage space upgrade solution for your Synology servers1. You can add up to 12 additional 2.5″ / 3.5″ SAS drive bays on the fly when connected directly with a mini-SAS HD cable.
Designed for maximum reliability
The redundant power supplies ensure maximum service uptime. On the rare occasion when a failure occurs, you can instantly replace the hot-swappable drive trays, and with the key system components modularized, SAS modules and system fans can also be replaced with ease.
High-performance data transmission
The mini-SAS HD provides high bandwidth connectivity to achieve maximum throughput during data transfer between your Synology server and RXD1219sas. It allows the drives in the connected RXD1219sas to operate as if they are the internal drives of the Synology server with no data latency.
Supports creating volumes across different units
Supports creating volumes on a single unit only
Compatible Drive Type
3.5″ SAS HDD
2.5″ SAS HDD
2.5″ SAS SSD
Maximum Internal Raw Capacity
192 TB (16 TB drive x 12) (Capacity may vary by RAID types)
Hot Swappable Drive
“Compatible drive type” indicates drives that have been tested to be compatible with Synology products. This term does not indicate the maximum connection speed of each drive bay.
Rack Installation Support
4-post 19″ rack (Synology Rail Kit – RKS1317)
The rail kit is sold separately
Power Supply Unit / Adapter
AC Input Power Voltage
100 V to 240 V AC
50/60 Hz, Single Phase
299.79 W (Access)
British Thermal Unit
1022.93 BTU/hr (Access)
Redundant Power Supply (for RP model)
Power consumption is measured when it is fully loaded with Seagate ST3600057SS hard drive(s).
0oC to 35oC (32oF to 95oF)
-20oC to 60oC (-5oF to 140oF)
5% to 95% RH
60 mm x 60 mm x 4 pcs
Easy Replacement System Fan
Noise Level Testing Environment: Fully loaded with Seagate ST2000VN000 hard drive(s) in the idle state. Two G.R.A.S. Type 40AE microphones, each set up 1 meter away from the Synology expansion unit at the front and rear. Background noise: 16.49-17.51 dB(A) Temperature: 24.25-25.75C Humidity: 58.2-61.8%.
Environment and Packaging
Main Unit X 1
Accessory Pack X 1
AC Power Cord X 2
Expansion Cable: Mini-SAS HD X 2
Quick Installation Guide X 1
Synology Rail Kit Sliding – RKS1317
Item Dimension (L”xW”xH”)
34 x 26 x 10