SilverStone’s RM21-304 is a high performance storage server chassis designed for the professional storage environment. It is equipped with hard drive trays compatible with 2.5" or 3.5" drives and has fan assembly with motherboard support for up to Micro-ATX form factor. There are also flexible mounts to accommodate most 2U single / 2U redundant server, PS2 (ATX) power supplies. RM21-304 also has ergonomic, tool-less rail* designs for easy rackmount integration. With an overall package designed for maximizing efficiency, flexibility, and durability, the RM21-304 is a great choice for professionals or data center engineers looking to build a storage server.

? Backplane support for 4 port SAS / SATA drives and 6 Gb/s Mini-SAS SFF-8087

? Supports four 2.5" / 3.5" SAS/SATA HDD / SSD

? Includes three 80 x 15mm PWM fans

? Independent drive status LED

? Supports Micro ATX motherboards

? Supports four low profile PCI / PCIe slots

? Auto lock handle design easily secures to rackmount cabinet without screws

Model No.SST-RM21-304Chassis form factor2UMotherboardMicro ATX (9.6" x 9.6"), Mini-ITX (6.7” x 6.7”)Drive BayExternal3.5" or 2.5" HDD/SSD hot-swap x 4Internal3.5" x 1, 2.5" x 1 (up to 15mm), slim optical x 1 (up to 12.7mm)Cooling System80 x 15mm ball bearing fan x 3, 4000±10%RPMPower Supply2U single or 2U redundant / PS2 (ATX) up to 160mm deep and 86.3mm height (not included)Limitation of CPU cooler68mmPower connector on HDD backplane4-Pin peripheral x 2Expansion SlotLow profile PCI / PCIe x 4Front I/O PortUSB 2.0 x 1, USB 3.1 Gen 1 Type-A x 1**Front buttonsPower On / Off, system resetIndicatorsChassis :
Power LED x 1: Blue
HDD Access x 1: Green
LAN LED x 2: Green
HDD Tray :
HDD Power LED x 8: Yellow
HDD Access x 8: Blinking greenHDD backplane4 ports SAS / SATA to Mini-SAS SFF-8087 x 1HDD InterfaceSAS-1 / SAS-2 / SAS-3
SATA-1 / SATA-2 / SATA-3Main metal thickness1mmNet Weight6.3 kgDimension430mm (W) x 88.5mm (H) x 480mm (D) 18.3 Liters
16.93" (W) x 3.48" (H) x 18.9" (D) 18.3 Liters