2U 12-bay 2.5" / 3.5" HDD / SSD rackmount storage server chassis with Mini-SAS HD SFF-8643 12 Gb/s interface

■ Backplane support for 12 port SAS / SATA drives and 12 Gb/s Mini-SAS HD SFF-8643 + SGPIO

■ Supports twelve 2.5"/3.5" SAS/SATA HDD/SSD hot-swap trays

■ Includes three 80mm x 38mm hot-swappable PWM fans

■ Independent drive status LED

■ Supports E-ATX or SSI-EEB motherboards

■ Supports 7 low profile PCI / PCIe slots

Distinctive exterior
Distinctive front panel features 12 x hot-swappable 3.5" bays or 12 x hot-swappable 2.5" bays with handle bars allowing for easy accessibility to the internal components
Storage device performance
HDD backplane supports 12 ports SAS / SATA drives and 12Gb/s Mini-SAS HD SFF-8643 x 3 with SGPIO
Cooling capabilities
Utilizing the typical front-to-back directional airflow, RM22-312 comes pre-installed with three 80mm x 38mm hot-swappable PWM fans, designed to achieve a rapid heat dissipation effect that does not easily accumulate hot air inside
Internal configurations
Sliding rail compatibility
Reserved mounting holes for sliding rails which can be easily installed. Can be used with RMS03-26 rail


Model No. SST-RM22-312
Chassis form factor 2U
Motherboard SSI-EEB, SSI-CEB, Extended ATX, ATX, Micro-ATX, Mini-ITX
Drive Bay External 3.5" hot-swap x 12
Internal --
Cooling System Hot-swap 80 x 38mm PWM fan x 3
Power Supply 2U single or 2U redundant (not included)***
Limitation of CPU cooler 68mm
Power connector on HDD backplane 4-Pin peripheral x 2
Expansion Slot Low profile PCI / PCIe x 7
Front I/O Port USB 3.1 Gen 1 Type-A x 2 **
Front buttons Power On / Off, system reset
Indicators Chassis
Power LED x 1: Blue
HDD Access x 1: Green
LAN LED x 2: Green

HDD Tray
HDD Power LED x 12: Yellow
HDD Access x 12: Blinking green
HDD backplane 12 ports SAS / SATA to Mini-SAS HD SFF-8643 x 3 with SGPIO
HDD Interface SAS III / II / I, SATA III / II / I
Main metal thickness 1.2mm
Net Weight 10.9 kg
Dimension 430mm (W) x 88.5mm (H) x 660mm (D), 25.1 Liters
16.93" (W) x 3.48" (H) x 25.98" (D), 25.1 Liters
  * Compatible with tool-less rail slide - RMS03-26
** RM22-312’s USB internal cable is 800mm long, so if you are connecting an external enclosure to the USB 3.1 port, we recommend using it with shorter cables to prevent performance loss
***Please make sure the mounting holes of your 2U PSU matches the mounting holes on the rear panel of RM22-312 (See below diagram)


  • Q&A

Describe Ver Size Download
RM22-312 backplane user guide V1.0 243 KB
RM22-312 manual V1.0 2,776 KB
RM22-312 High resolution photos 11,474 KB
RM22-312 Product Sheet V1.0 241 KB

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The connection between the backplane and the motherboard or the host control card is only a SATA data transmission cable. This cable does not contain the control signal of the LED. Therefore, in the definition of SATA HDD, SATA Power Pin11 is reserved for the staggered spinup/activity indication of the HDD. The HDD backplane of any NAS or server chassis is based on this specification as the indicator light of the HDD.
If your HDD tray cannot display this LED light, we recommend to check with HDD manufacturer if your HDD has a reserved LED signal that can be driven by SATA power pin11.