Secure storage for your business
Synology RS2421+/RS2421RP+ are versatile 2U 12-bay storage servers designed to accommodate a diverse set of business environments. Scalable up to 24 drives, they are designed for cost-effective file management and sharing and include powerful backup capabilities designed for businesses with a growing data footprint. The unit delivers 2,200 MB/s 64K sequential read and 1154 MB/s sequential write performance1, and can be optionally enhanced with SSD cache and 10/25Gb Ethernet.
AMD Ryzen™ V1500B quad-core 2.2 GHz
2,200 MB/s seq. read and 1154 MB/s seq. write performance
4 GB ECC DDR4, up to 32 GB
Up to 24 drive bays with RX1217(RP)
High performance storage for anything
Over 106K/59K random read/write IOPS and up to 2,200/1,154 MB/s sequential read/write throughput ensure ample performance for demanding workloads.
* compared to predecessor RS2418(RP)+
Built for reliability
Redundant power(*Redundant power only available in the RS2421RP+ model.)
Reduce the possibility of power disruptions on a single distribution channel or PDU adversely impacting data and service availability.
Pair two identical devices with Synology High Availability and enable automatic minute-level failover between both devices in the event one server fails.
AMD Ryzen V1500B
4-core 2.2 GHz
Hardware Encryption Engine (AES-NI)
4 GB DDR4 ECC UDIMM
Memory Module Pre-installed
4 GB (4 GB x 1)
Total Memory Slots
Maximum Memory Capacity
32 GB (16 GB x 2)
Please select Synology memory modules for optimum compatibility and reliability. Synology will not provide complete product warranty or technical support if non-Synology memory modules are used for memory expansion.
Synology reserves the right to replace memory modules with the same or higher frequency based on suppliers product life cycle status. Rest assured that the compatibility and stability have been strictly verified with the same benchmark to ensure identical performance.
Maximum Drive Bays with Expansion Unit
24 (RX1217/RX1217RP x 1)
Compatible Drive Type
3.5″ SATA HDD
2.5″ SATA HDD
2.5″ SATA SSD
(See all supported drives: https://www.synology.com/en-us/compatibility)
Maximum Single Volume Size
Hot Swappable Drive
It is strongly recommended that you only install drives listed on your devices compatibility list. Storage pool and volume creation processes may fail when using unverified drives. Synology is unable to provide technical support for devices using unsupported components.
“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.
Each internal volume (may consist of multiple drives) is expandable up to 108TB.
RJ-45 1GbE LAN Port
4 (with Link Aggregation / Failover support)
USB 3.2 Gen 1 Port
The USB 3.0 standard was renamed to USB 3.2 Gen 1 by the USB Implementers Forum (USB-IF) in 2019.
1 x Gen3 x8 slot (x4 link)
exFAT Access is purchased separately in Package Center.
Form Factor (RU)
Rack Installation Support
4-post 19″ rack (Synology Rail Kit – RKS1317)
The rail kit is sold separately
60 mm x 60 mm x 3 pcs
Fan Speed Mode
Easy Replacement System Fan