1. Introducció
The SilverStone RM21-304 is a high-performance 2U rackmount server chassis designed for professional storage environments. This manual provides detailed instructions for the proper setup, operation, and maintenance of your RM21-304 chassis to ensure optimal performance and longevity.
Key features include hard drive trays compatible with 2.5" or 3.5" drives, a fan assembly with motherboard support for up to Micro-ATX form factor, and flexible mounts for various power supply types (2U single/redundant server, PS2 ATX). The design also incorporates ergonomic, tool-less rail designs for simplified rack integration.
2. Informació de seguretat
ADVERTIMENT:
- Desconnecteu sempre l'alimentació abans d'instal·lar o treure components.
- Wear anti-static wrist straps to prevent electrostatic discharge (ESD) damage.
- Ensure proper grounding of the chassis and all connected equipment.
- Do not operate the chassis with the cover removed in a production environment.
- Refer to component manuals for specific installation requirements.
3. Contingut del paquet
Verifiqueu que tots els components siguin presents abans de continuar amb la instal·lació:
- SilverStone RM21-304 Chassis
- Accessory Kit (screws, standoffs, etc.)
- Guia d'inici ràpid (aquest document)
- Optional: Sliding Rail Kit (if purchased separately)

Figure 3.1: Included accessory kit with various screws for different components.
4. Configuració i instal·lació
4.1 Preparació del xassís
Before installing components, ensure the chassis is placed on a stable, flat surface. Remove the top cover by unscrewing the retaining screws at the rear of the chassis.

Figura 4.1: Interior view of the RM21-304 chassis, showing fan assembly and drive bays.
4.2 Instal·lació de la placa base
- Install the I/O shield into the chassis rear panel.
- Align the Micro-ATX motherboard with the standoffs inside the chassis.
- Fixeu la placa base amb els cargols adequats del kit d'accessoris.
4.3 Drive Installation (2.5" / 3.5" Drives)
The RM21-304 supports both 2.5" and 3.5" drives in its hot-swappable drive bays.
- Open the latch on the drive tray.
- Insert the 2.5" or 3.5" drive into the tray and secure it with screws.
- Slide the populated drive tray into an available drive bay until it clicks into place.

Figure 4.2: Close-up of a drive tray being inserted into the chassis.
4.4 Instal·lació de la font d'alimentació
The chassis accommodates 2U single/redundant server or PS2 (ATX) power supplies. Install the power supply according to its manufacturer's instructions, securing it to the chassis rear panel.
4.5 Cables de connexió
Connect all necessary cables, including power, SATA, and front panel connectors (USB, power/reset buttons, LED indicators) to the motherboard and drives.
Video 4.1: Demonstrates how to connect cables to the motherboard and install the sliding rail. This video is provided by CICHENG INC, a seller.
Video 4.2: Illustrates the process of connecting cables within the chassis to the motherboard and installing the rail. This video is provided by CICHENG INC, a seller.
4.6 Optional: Sliding Rail Installation
For easy rack integration, optional sliding rails can be installed. Follow the instructions below to attach the rails to the chassis and the server rack.
- Separate the inner rail from the outer rail by pressing the release tab.
- Attach the inner rails to the sides of the RM21-304 chassis using the provided screws.
- Attach the outer rails to the server rack posts, ensuring proper alignment and spacing.
- Slide the chassis with the inner rails into the outer rails mounted on the rack until it locks securely.
Video 4.3: Detailed guide on how to install the sliding rail with the chassis and cabinet. This video is provided by CICHENG INC, a seller.
5. Instruccions de funcionament
5.1 Engegada/apagada
Press the power button on the front panel to turn the server on. To power off, perform a graceful shutdown through the operating system, then press the power button if necessary.

Figure 5.1: Front panel of the RM21-304, highlighting power/reset buttons and USB ports.
5.2 Indicadors LED
The front panel features LED indicators for system status:
- LED verd: Indicador de potència.
- LED blau: Data activity indicator for drives.
- Other LEDs may indicate network activity or system warnings, depending on motherboard configuration.
Video 5.1: Explains the meaning of the Green LED (Power) and Blue LED (Data) indicators on the chassis. This video is provided by CICHENG INC, a seller.
6. Manteniment
6.1 Neteja
Regularly clean the chassis exterior with a soft, dry cloth. For internal cleaning, disconnect power and use compressed air to remove dust from fans and components. Ensure all dust filters are clean to maintain optimal airflow.
6.2 Manteniment del ventilador
The chassis features a fan assembly for cooling. Periodically check the fans for dust buildup and ensure they are spinning freely. Replace any noisy or malfunctioning fans promptly.

Figura 6.1: Intern view showing the fan assembly within the chassis.
7. Solució De Problemes
- Sense energia: Check all power connections, including the power supply unit (PSU) and wall outlet. Verify the power button is functioning.
- El sistema no arrenca: Ensure all internal components (motherboard, RAM, CPU, drives) are correctly seated and connected. Check for any POST error codes or beeps from the motherboard.
- Sobreescalfament: Verify all fans are operational and free of obstructions. Ensure proper airflow within the rack and server room. Clean dust filters.
- Drive Detection Issues: Check SATA data and power connections to the drives. Ensure drives are properly seated in their trays.
8. Especificacions
| Característica | Detall |
|---|---|
| Marca | SilverStone |
| Número de model | SST-RM21-304 |
| Factor de forma | Muntatge en rack 2U |
| Dimensions (LxWxH) | 16.93 x 3.48 x 18.9 polzades |
| Pes | 21.5 lliures |
| Material | Metall |
| Suport de la placa base | Micro-ATX |
| Drive Bays | Compatible with 2.5" or 3.5" Drives |
| Suport d'alimentació | 2U Single/Redundant Server, PS2 (ATX) |
| Refrigeració | Fan Assembly Included |
9. Garantia i Suport
Per obtenir informació sobre la garantia i assistència tècnica, consulteu la pàgina oficial de SilverStone. weblloc web o poseu-vos en contacte amb el seu departament d'atenció al client. Conserveu el comprovant de compra per a reclamacions de garantia.
Recursos en línia:
- SilverStone Official Weblloc: www.silverstonetek.com
- Product Page (RM21-304): Pàgina de producte d'Amazon





