12TB Flash


NVMe PCIe x8 Gen3 Edge Card


Zoned Namespaces (ZNS), Symphonic API, or Open-Channel 2 interface

Architectural Advantages


  • Optimal for tiering different classes of memory storage media
  • DMA engine improves system performance and offloads host resources
  • Scale NVRAM and Flash tiers proportionately as SSDs are added to the system
  • Delegated Move capability reduces traffic across the system bus and host overhead
  • Device appears as a block device that supports DMA or byte addressable mmap PIO
  • Simplifies low latency support of NVMe Direct, RDMA, or NVMe-over-Fabric implementations

The RMS-325 provides host systems with direct control over both its byte addressable User NVRAM, high capacity Flash storage, and transferring data between the two medias. The example below illustrates how the RMS-325 enables a host to write data into its on-board NVRAM, then issue a single Delegated Move command to transfer the data from NVRAM to local Flash storage.



  • 3TB, 6TB or 12TB TLC NAND Flash Capacity
  • User NVRAM: 4GB or 12GB
  • NVMe PCIe x8 Gen3 interface
  • Half-height, half-length form factor
  • On-board Capacitors – no cabling to remote power packs required
  • Symphonic™ CFM with Zoned Namespaces (ZNS), the original Symphonic API, or an Open-Channel 2* Flash Management mode
  • Fault Tolerant Flush-to-Flash™ Backup System
  • DuraLife™ Ultra-Capacitor Power Management System
  • DiaLog™ OEM Diagnostic Lifecycle Monitoring




Flash Management: Symphonic CFM or Open-Channel* mode

Today’s SSDs are encumbered by a legacy abstraction known as the Flash Translation Layer (FTL) that incurs expensive overhead, unpredictable latency spikes, and suboptimal performance that prematurely wears out the Flash media.  Alternatively, the RMS-325 is based upon Symphonic™ CFM with configuration options for either Zoned Namespaces (ZNS), the original Symphonic API, or an Open-Channel 2* compliant interface.

Zoned Namespaces


Symphonic CFM


Radian’s implementation of Open-Channel 2 Flash management


Advantages of User NVRAM combined with High Capacity Flash




Advantages over NVDIMMs




1434855273_FEZ-03 RMS-325 Data Sheet



*Open-Channel Specification Revision 2.0, January 29, 2018