Expansion Unit RX1217​/​RX1217RP

Scale up your RackStation in a breeze

Volume Expansion & Backup

When drive capacity is running low on a Synology RackStation, Synology RX1217/RX1217RP offers an easy way to immediately expand storage by providing 12 additional drive slots. The RAID volume on the Synology RackStation can be expanded directly without having to reformat the existing hard drives, ensuring service continuity during the expansion process. To ensure 24/7 service uptime, Synology RX1217RP is equipped with redundant power supplies, allowing automatic failover support if one of the PSUs fail.

When created as a separate volume, Synology RX1217/RX1217RP also serves as an additional local backup destination for Synology RackStations.

Reliable Plug-and-Use Design

Synology RX1217/RX1217RP securely connects to Synology RackStation servers with a high-bandwidth expansion cable, ensuring maximum data throughput and smooth operation — as if they are part of the internal drives of Synology RackStation. SATA 6Gb/s interface ensures the installed drives provide high quality, outstanding data processing performance.

Green & Easy to Manage

Hibernation mode can be manually configured to start automatically when the system has been inactive for a period of time. This not only saves energy but also extends the lifespan of hard drives. RX1217/RX1217RP will also smartly power on/off with the attached RackStation, so no user intervention is needed to keep this system running smartly and efficiently.

DX1215 comes with a fast detachable fan module with two 120 X 120mm fans and screwless drive trays, making system components replacement fast and tool-free.

Hardware Specifications 
Applied ModelsRS4017xs+
NoteDSM version requirement: 6.0.1-7393 or later version
Drive Bays12
Compatible Drive Type* (See all supported drives)3.5" SATA HDD
 2.5" SATA HDD
 2.5" SATA SSD
Maximum Internal Raw Capacity144 TB (12 TB drive x 12) (Capacity may vary by RAID types)
Hot Swappable Drive 
RAID Management through Synology DSM 
External Ports 
Infiniband port1
Size (Height x Width x Depth)88 mm x 430.5 mm x 664 mm
 88 mm x 430.5 mm x 692 mm (for RP model)
Weight12.7 kg
 13.4 kg (for RP model)
Power RecoverySynchronized with the Synology RackStation
Power Supply Unit / Adapter500W
 2 X 500W (for RP model)
AC Input Power Voltage100V to 240V AC
Power Frequency50/60 Hz, Single Phase
Power Consumption*68.60 W (Access)
 27.45 W (HDD Hibernation)
 71.32 W (Access, for RP model)
 31.20 W (HDD Hibernation, for RP model)
British Thermal Unit234.23 BTU/hr (Access)
 93.73 BTU/hr (HDD Hibernation)
 243.52 BTU/hr (Access, for RP model)
 106.53 BTU/hr (HDD Hibernation, for RP model)
NotePower consumption is measured when fully loaded with Western Digital 1TB WD10EFRX hard drive(s).
Redundant Power Supply (for RP model) 
Operating Temperature5°C to 35°C (40°F to 95°F)
Storage Temperature-20°C to 60°C (-5°F to 140°F)
Relative Humidity5% to 95% RH
System Fan80 mm x 80 mm x 3 pcs
Easy Replacement System Fan 
Noise Level*54.6 dB(A)
 54.2 dB(A) (for RP model)
NoteNoise Level Testing Environment: Fully loaded with Seagate 1TB ST31000520AS hard drive(s) in idle; Two G.R.A.S. Type 40AE microphones, each set up at 1 meter away from the Synology NAS front and rear; Background noise: 16.49-17.51 dB(A); Temperature: 24.25-25.75˚C; Humidity: 58.2-61.8%
Warranty5 Years
Environment & Packaging 
EnvironmentRoHS Compliant
Packaging ContentMain Unit X 1
 Accessory Pack X 1
 AC Power Cord X 1
 AC Power Cord X 2 (for RP model)
 Expansion Cable: Infiniband X 1
 Quick Installation Guide X 1